{"id":207666,"date":"2023-03-16T18:33:36","date_gmt":"2023-03-16T22:33:36","guid":{"rendered":"https:\/\/www.nasa.gov\/?p=207666"},"modified":"2024-04-01T12:33:57","modified_gmt":"2024-04-01T16:33:57","slug":"toxicology-and-environmental-chemistry","status":"publish","type":"post","link":"https:\/\/www.nasa.gov\/directorates\/esdmd\/hhp\/toxicology-and-environmental-chemistry\/","title":{"rendered":"Toxicology and Environmental Chemistry"},"content":{"rendered":"<div id=\"\" class=\"padding-top-5 padding-bottom-3 width-full maxw-full hds-module hds-module-full wp-block-nasa-blocks-article-intro\"><div class=\"width-full maxw-full article-header\"><div class=\"margin-bottom-2 width-full maxw-full\"><p class=\"label carbon-60 margin-0 margin-bottom-3 padding-0\">5 min read<\/p><h1 class=\"display-48 margin-bottom-2\">Toxicology and Environmental Chemistry<\/h1><\/div><\/div><\/div>\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover \"><div class=\"parallax-default\"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"2048\" height=\"1536\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?w=2048\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"space toxicologist\" style=\"transform: scale(1.1); transform-origin: 51% 69%; object-position: 51% 69%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg 3000w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?resize=300,225 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?resize=768,576 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?resize=1024,768 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?resize=1536,1152 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?resize=2048,1536 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?resize=400,300 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?resize=600,450 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?resize=900,675 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?resize=1200,900 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?resize=2000,1500 2000w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" loading=\"eager\" \/><\/a><\/div><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">A space toxicologist at NASA JSC.<\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\">Ensuring Astronaut Safety<\/h2>\n\n\n\n<p>Achieving safe exploration of space in vehicles that rely upon closed environmental systems to recycle air and water to sustain life and are operated in extremely remote locations is a major challenge. The Toxicology and Environmental Chemistry (TEC) group at Johnson Space Center (JSC) is made up of 2 interrelated groups: Toxicology support and the Environmental Chemistry Laboratory. The scientists in both groups play an important role in ensuring that the crew of the ISS are breathing clean air and drinking clean water. Personnel within the TEC establish safe spacecraft environmental limits, monitor the air and water quality aboard current spacecraft (ISS and Commercial Crew and Cargo vehicles), and support technology advancements. The TEC employs in-flight monitoring capabilities as well as postflight sample analysis techniques to monitor the air and water quality from spaceflight.<\/p>\n\n\n<div id=\"\" class=\"nasa-gb-align-center padding-y-3 maxw-full width-full display-flex flex-align-center hds-module wp-block-nasa-blocks-blockquote\"><div class=\"grid-container grid-container-block display-flex flex-column flex-justify-center padding-0\">\n\t\t<div class=\"grid-col-12 desktop:display-flex mobile:display-block\">\n\t\t\t<div class=\"blockquote-icon margin-bottom-3\">\n\t\t\t\t<svg class=\"tablet:square-4 square-4 margin-right-3\" version=\"1.1\" aria-hidden=\"true\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" viewBox=\"0 0 3000 3000\" style=\"enable-background:new 0 0 3000 3000;\" xml:space=\"preserve\"> <g> <path d=\"M586.7,1429.7c-10.7,1.5-21.4,2.8-33.9,4.5c6.9-26.6,12.7-50.7,19.5-74.6c32.4-114.1,78.5-222.2,146.8-319.5 c90.2-128.5,202.5-235.3,327.7-329.1c8.4-6.3,16.7-12.6,25.3-19.1c-66.3-105.1-131.5-208.6-197.3-313.1c-3.5,1.2-5.5,1.6-7.2,2.6 C714.4,469,576.1,575.7,456,705.3c-126,135.9-226.2,289.1-303,457.8c-98.8,217.1-151.3,444-147.2,683.3 c1.7,100.5,12.9,199.6,41.1,296.3C93.7,2303,182.2,2433,326.7,2520.1c176.9,106.7,366.8,126.8,563.4,70.5 c150.9-43.2,260.9-138.9,327.2-282.5c33.4-72.5,47.8-149.4,52-228.7c6.5-122.8-14.1-239.5-74.3-348.1 C1074.6,1514.5,832.7,1394.2,586.7,1429.7z\"><\/path><path d=\"M2912.5,1722c-129.9-210.9-320.2-309.4-567.9-296c-22.1,1.2-44,5.1-67.4,7.9c2.2-9.6,4-17.9,6.1-26.2 c37.9-153.6,99.3-296,198.8-420.5c77.8-97.4,167.1-182.9,265.8-258.8c15.6-12,31.3-23.9,47.9-36.5 c-66.2-105.1-131.9-209.2-197.2-312.8c-3.5,1.1-5.1,1.2-6.4,2c-167.2,95.6-316.1,213.7-443.2,358.8 c-105.1,119.9-191.1,252.3-259.5,396.3c-95.5,201-152.1,411.6-159.1,634.8c-3.9,125.5,4.8,249.7,40.1,371 c46.7,160.8,135.7,290.9,280.5,378.7c165.7,100.5,344.8,123,531.2,78.8c172.4-40.8,296.4-143.9,366.3-308.5 c28.5-67.2,40.6-138,44.6-210.5C3000.2,1953.3,2979.9,1831.4,2912.5,1722z\"><\/path><\/g><\/svg>\n\t\t\t<\/div>\n\t\t\t<div class=\"blockquote-content\">\n\t\t\t\t<div class=\"margin-bottom-4\">\n\t\t\t\t\t<h2 class=\"font-weight-extralight line-height-sm margin-top-0 section-heading-sm\"><span class=\"section-heading-sm\">Fun Fact: We are currently recovering 85% of the water from crew urine and turning it back into drinking water.<\/span><\/h2>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"display-flex\">\n\t\t\t\t\t<div class=\"blockquote-image hds-cover-wrapper margin-right-3\"><figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/07\/cropped-581097main_STS-1_Dust-it-Off-mp3-image.gif?w=150&h=150&crop=1\" class=\"attachment-thumbnail size-thumbnail\" alt=\"NASA\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" \/><\/figure><\/div>\n\t\t\t\t\t<div class=\"grid-col-11\">\n\t\t\t\t\t\t<p class=\"blockquote-credit-name line-height-sm margin-0\">NASA<\/p>\n\t\t\t\t\t\t<p class=\"blockquote-credit-title line-height-sm padding-0 margin-0\"><\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\">An Agency Resource<\/h2>\n\n\n\n<p>The Toxicology group at JSC serves as the NASA-wide resource for aspects of space toxicology and is responsible for several different duties that are focused on protecting crewmembers and spacecraft systems from toxic exposures in spaceflight. These include assessing chemical hazards for flight, establishing limits for contaminants in spacecraft air and water, assessing and evaluating environmental data from spacecraft in flight, and assessing the potential for off-gas products from new vehicles or modules. These assessments are documented in:<\/p>\n\n\n<div id=\"\" class=\"nasa-gb-align-center nasa-button-link padding-y-1 padding-x-0 hds-module wp-block-nasa-blocks-related-link\">\n\t<a href=\"https:\/\/www.nasa.gov\/directorates\/esdmd\/hhp\/hazardous-material-summary-tables-hmsts\/\" target=\"_self\" class=\"button-primary button-primary-md link-external-false\" aria-label=\"Hazardous Materials Summary Tables (HMSTs) and Hazardous Materials data files (HazMats)\">\n\t\t<span class=\"line-height-alt-1\">Hazardous Materials Summary Tables (HMSTs) and Hazardous Materials data files (HazMats)<\/span>\n\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"button-primary-circle\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t<\/a>\n\n\t<\/div>\n\n<div id=\"\" class=\"nasa-gb-align-center nasa-button-link padding-y-1 padding-x-0 hds-module wp-block-nasa-blocks-related-link\">\n\t<a href=\"https:\/\/www.nasa.gov\/directorates\/esdmd\/hhp\/exposure-guidelines-smacs-and-swegs\/\" target=\"_self\" class=\"button-primary button-primary-md link-external-false\" aria-label=\"Spacecraft Maximum Allowable Concentrations (SMACs) and Spacecraft Water Exposure Guidelines (SWEGs)\">\n\t\t<span class=\"line-height-alt-1\">Spacecraft Maximum Allowable Concentrations (SMACs) and Spacecraft Water Exposure Guidelines (SWEGs)<\/span>\n\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"button-primary-circle\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t<\/a>\n\n\t<\/div>\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-2.png\"><img loading=\"lazy\" decoding=\"async\" width=\"764\" height=\"572\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-2.png?w=764\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"TEC air quality laboratory\" style=\"transform: scale(1); transform-origin: 82% 47%; object-position: 82% 47%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-2.png 764w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-2.png?resize=300,225 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-2.png?resize=400,299 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-2.png?resize=600,449 600w\" sizes=\"(max-width: 764px) 100vw, 764px\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">The TEC air quality laboratory.<\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p>The Environmental Chemistry laboratory at JSC occupies approximately 6,000 sq. ft. of laboratory space in one of the newest buildings on site. This is a fully equipped environmental and analytical laboratory with analysts that have supported multiple human spaceflight programs and provided center support for both gas and liquid analysis. The work in the laboratories operates under an ISO 9001\/AS9100-certified quality plan with dedicated and independent quality personnel. <\/p>\n\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-3.png\"><img loading=\"lazy\" decoding=\"async\" width=\"523\" height=\"400\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-3.png?w=523\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"Liquid chromatograph mass spectrometer.\" style=\"transform: scale(1); transform-origin: 32% 26%; object-position: 32% 26%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-3.png 523w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-3.png?resize=300,229 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-3.png?resize=400,306 400w\" sizes=\"(max-width: 523px) 100vw, 523px\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">Liquid chromatograph mass spectrometer.<\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p>The Environmental Chemistry Laboratory monitors for contaminants in spacecraft air using both in-flight and post-flight methods. Onboard the International Space Station (ISS), 2 Air Quality Monitors (AQMs) use gas chromatography\/differential mobility spectrometry to detect and quantify 23 target volatile organic compounds to provide near real-time insight into the status of the ISS atmosphere. Other real-time monitors supported by the Environmental Chemistry laboratory include the compound-specific analyzer-combustion products (CSA-CP), which use electrochemical sensors to analyze the atmosphere for the presence of compounds produced by fire, and the CO2 monitor, which uses non-dispersive infrared reflectance to monitor for the presence of elevated CO2. For detailed post-flight analysis in the Environmental Chemistry Laboratory, astronauts use grab sample containers to collect in-flight samples, which are then returned to JSC for a detailed environmental analysis. Similarly, formaldehyde monitoring kits contain badges used to collect formaldehyde. These also are returned to the ground for spectroscopic analysis. <\/p>\n\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-4.png\"><img loading=\"lazy\" decoding=\"async\" width=\"671\" height=\"380\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-4.png?w=671\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"Air quality monitor\" style=\"transform: scale(1); transform-origin: 47% 67%; object-position: 47% 67%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-4.png 671w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-4.png?resize=300,170 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-4.png?resize=400,227 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-4.png?resize=600,340 600w\" sizes=\"(max-width: 671px) 100vw, 671px\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">Air quality monitors used for volatile organic compound detection positioned in the U.S. Lab on the ISS.<\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p>The Environmental Chemistry Laboratory also analyzes archival samples returned from the ISS. The majority of water consumed by crewmembers on the ISS is recycled from a combination of condensed atmospheric humidity and urine. This wastewater is then treated by the U.S. water processor assembly (WPA) to produce potable water, which is analyzed to ensure that the water meets U.S. potability requirements. Samples of the humidity condensate and condensate\/urine distillate also are returned for analysis to provide insight into the operation of the WPA and the overall US water recovery system. The TEC relies upon the in-flight analytical capability provided by the ISS total organic carbon analyzer (TOCA) to determine real-time total organic carbon concentrations, which are used to protect ISS crew health as well as manage the U.S. water system consumables. Similarly, the colorimetric water quality monitoring kit (CWQMK) is used to provide insight into the biocide concentration in the U.S. water.<\/p>\n\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/08\/tec-image-5.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1038\" height=\"398\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/08\/tec-image-5.jpg?w=1038\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"CSA-CP\" style=\"transform: scale(1); transform-origin: 44% 75%; object-position: 44% 75%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/08\/tec-image-5.jpg 1038w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/08\/tec-image-5.jpg?resize=300,115 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/08\/tec-image-5.jpg?resize=768,294 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/08\/tec-image-5.jpg?resize=1024,393 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/08\/tec-image-5.jpg?resize=400,153 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/08\/tec-image-5.jpg?resize=600,230 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/08\/tec-image-5.jpg?resize=900,345 900w\" sizes=\"(max-width: 1038px) 100vw, 1038px\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">The CSA-CP used to monitor for evidence of fires or smoldering events on the ISS.<\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p>Water samples are also collected in flight and stored for return to Johnson Space Center.  The following ground-based equipment is used to analyze archival samples to ensure suitable air and water quality:<\/p>\n\n\n\n<ul>\n<li>Liquid Chromatography\/Refractive Index Detection (LC\/RI)<\/li>\n\n\n\n<li>Gas Chromatography\/Flame Ionization Detector (GC\/FID)<\/li>\n\n\n\n<li>Gas Chromatography\/Thermal Conductivity Detector (GC\/TCD)<\/li>\n\n\n\n<li>Trace Gas Analyzer<\/li>\n\n\n\n<li>Gas Chromatography\/Mass Spectrometry (GC\/MS)<\/li>\n\n\n\n<li>Liquid Chromatography\/Mass Spectrometry (LC\/MS)<\/li>\n\n\n\n<li>Inductively Coupled Plasma\/Mass Spectrometry (ICP\/MS)<\/li>\n\n\n\n<li>Ion Chromatography (IC)<\/li>\n\n\n\n<li>UV\/VIS Spectrophotometry<\/li>\n\n\n\n<li>Fourier Transform Infrared Reflectance (FTIR)<\/li>\n\n\n\n<li>Total Organic Carbon Analyzer (TOCA)<\/li>\n<\/ul>\n\n\n\n<p>In addition to analysis of flight samples and real-time data, the Environmental Chemistry laboratory team plays an important role in the development of new Environmental Control and Life Support Systems hardware by providing analytical support during ground testing. Similarly, the TEC scientists pursue and support technology demonstrations aimed at developing new methods for real-time data collection. Recent examples of this support have included the multi-gas monitor (MGM) and the personal CO<sub>2<\/sub> monitor. TEC scientists make vital contributions to consolidating environmental monitoring hardware to reduce mass and volume requirements, both of which are important as NASA moves to more long-term missions in smaller vehicles.<\/p>\n\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-none \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-6.png\"><img loading=\"lazy\" decoding=\"async\" width=\"334\" height=\"385\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-6.png?w=334\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"U.S. TOCA\" style=\"transform: scale(1); transform-origin: 50% 19%; object-position: 50% 19%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-6.png 334w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/tec-image-6.png?resize=260,300 260w\" sizes=\"(max-width: 334px) 100vw, 334px\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">The U.S. TOCA used to test water quality in real-time on the ISS<\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\">Spaceflight Air and Water Quality<\/h2>\n\n\n\n<p>Toxicology and Environmental Chemistry (TEC) monitors airborne contaminants in both spacecraft air and water. In-flight monitors are employed to provide real-time insight into the environmental conditions on ISS. Archival samples are collected and returned to Earth for full characterization of ISS air and water.<\/p>\n\n\n<div id=\"\" class=\"nasa-gb-align-center nasa-button-link padding-y-1 padding-x-0 hds-module wp-block-nasa-blocks-related-link\">\n\t<a href=\"https:\/\/www.nasa.gov\/directorates\/esdmd\/hhp\/toxicology-analysis-of-spacecraft-air\/\" target=\"_self\" class=\"button-primary button-primary-md link-external-false\" aria-label=\"Results of Post-Flight\u00a0Analysis\u00a0of In-Flight Air\u00a0and Water\u00a0Samples\">\n\t\t<span class=\"line-height-alt-1\">Results of Post-Flight\u00a0Analysis\u00a0of In-Flight Air\u00a0and Water\u00a0Samples<\/span>\n\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"button-primary-circle\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t<\/a>\n\n\t<\/div>\n\n\n<h2 class=\"wp-block-heading\">Points of Contact<\/h2>\n\n\n\n<p>Paul Mudgett, PhD<br>Valerie Ryder, PhD DABT<br>Spencer Williams, PhD DAB<br>William T. Wallace, PhD<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div id=\"\" class=\"nasa-gb-align-center nasa-button-link padding-y-1 padding-x-0 hds-module wp-block-nasa-blocks-related-link\">\n\t<a href=\"https:\/\/www.nasa.gov\/hhp\/hhp-capabilities\/\" target=\"_self\" class=\"button-primary button-primary-md link-external-false\" aria-label=\"Human Health and Performance Capabilities \">\n\t\t<span class=\"line-height-alt-1\">Human Health and Performance Capabilities <\/span>\n\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"button-primary-circle\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t<\/a>\n\n\t<\/div>\n\n<div id=\"\" class=\"nasa-gb-align-full width-full maxw-full padding-x-3 padding-y-0 nasa_template_article_b hds-module hds-module-full wp-block-nasa-blocks-credits-and-details\">\n<section class=\"padding-x-0 padding-top-5 padding-bottom-2 desktop:padding-top-7 desktop:padding-bottom-9\">\n\t<div class=\"grid-row grid-container maxw-widescreen padding-0\">\n\t\t<div class=\"grid-col-12 desktop:grid-col-2 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\">\n\t\t\t<div class=\"padding-top-3 border-top-1px border-color-carbon-black\">\n\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t<h2 class=\"heading-14\">Share<\/h2>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"padding-bottom-2\">\n\t\t\t\t\t<ul class=\"social-icons social-icons-round\">\n\t\t\t\t\t\t<li class=\"social-icon social-icon-x\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/x.com\/intent\/tweet?via=NASA&text=Toxicology%20and%20Environmental%20Chemistry&url=https%3A%2F%2Fwww.nasa.gov%2Fdirectorates%2Fesdmd%2Fhhp%2Ftoxicology-and-environmental-chemistry%2F\" aria-label=\"Share on X.\">\n\t\t\t\t\t\t\t\t<svg width=\"1200\" height=\"1227\" viewBox=\"0 0 1200 1227\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M714.163 519.284L1160.89 0H1055.03L667.137 450.887L357.328 0H0L468.492 681.821L0 1226.37H105.866L515.491 750.218L842.672 1226.37H1200L714.137 519.284H714.163ZM569.165 687.828L521.697 619.934L144.011 79.6944H306.615L611.412 515.685L658.88 583.579L1055.08 1150.3H892.476L569.165 687.854V687.828Z\" fill=\"white\"\/><\/svg>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<li class=\"social-icon social-icon-facebook\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.facebook.com\/sharer.php?u=https%3A%2F%2Fwww.nasa.gov%2Fdirectorates%2Fesdmd%2Fhhp%2Ftoxicology-and-environmental-chemistry%2F\" aria-label=\"Share on Facebook.\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 8h-3v4h3v12h5v-12h3.642l.358-4h-4v-1.667c0-.955.192-1.333 1.115-1.333h2.885v-5h-3.808c-3.596 0-5.192 1.583-5.192 4.615v3.385z\"\/><\/svg>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<li class=\"social-icon social-icon-linkedin\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.linkedin.com\/shareArticle?mini=true&url=https%3A%2F%2Fwww.nasa.gov%2Fdirectorates%2Fesdmd%2Fhhp%2Ftoxicology-and-environmental-chemistry%2F\" aria-label=\"Share on LinkedIn.\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4.98 3.5c0 1.381-1.11 2.5-2.48 2.5s-2.48-1.119-2.48-2.5c0-1.38 1.11-2.5 2.48-2.5s2.48 1.12 2.48 2.5zm.02 4.5h-5v16h5v-16zm7.982 0h-4.968v16h4.969v-8.399c0-4.67 6.029-5.052 6.029 0v8.399h4.988v-10.131c0-7.88-8.922-7.593-11.018-3.714v-2.155z\"\/><\/svg>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<li class=\"social-icon social-icon-rss\">\n\t\t\t\t\t\t\t<a href=\"\/feed\/\" aria-label=\"Subscribe to RSS feed.\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 800 800\" aria-hidden=\"true\"><path d=\"M493 652H392c0-134-111-244-244-244V307c189 0 345 156 345 345zm71 0c0-228-188-416-416-416V132c285 0 520 235 520 520z\"\/><circle cx=\"219\" cy=\"581\" r=\"71\"\/><\/svg>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t<\/ul>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<div class=\"grid-col-12 desktop:grid-col-5 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\">\n\t\t\t<div class=\"padding-top-3 border-top-1px border-color-carbon-black\">\n\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t<h2 class=\"heading-14\">Details<\/h2>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"grid-row margin-bottom-3\">\n\t\t\t\t\t<div class=\"grid-col-4\">\n\t\t\t\t\t\t<div class=\"subheading\">Last Updated<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"grid-col-8\">Apr 01, 2024<\/div>\n\t\t\t\t<\/div>\n\t\t\t<div class=\"grid-row margin-bottom-3\"><div class=\"grid-col-4\"><div class=\"subheading\">Editor<\/div><\/div><div class=\"grid-col-8\">Robert E. Lewis<\/div><\/div><div class=\"grid-row\"><div class=\"grid-col-4\"><div class=\"subheading\">Location<\/div><\/div><div class=\"grid-col-8\"><a class=\"hds-location-tag-name\" href=\"\/johnson\/\"><span class=\"hds-meta-heading\">Johnson Space Center<\/span><\/a><\/div><\/div>\t\t\t<\/div>\n\t\t<\/div>\n\t<div class=\"grid-col-12 desktop:grid-col-5 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\"><div class=\"padding-top-3 border-top-1px border-color-carbon-black \"><div class=\"margin-bottom-2\"><h2 class=\"heading-14\">Related Terms<\/h2><\/div><ul class=\"article-tags\"><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/hhp\">Human Health and Performance<\/a><\/li><\/ul><\/div><\/div>\n\t<\/div>\n<\/section>\n\t<\/div>\n\n<div id=\"\" class=\"nasa-gb-align-full width-full maxw-full padding-x-3 padding-y-0 hds-module hds-module-full wp-block-nasa-blocks-related-articles\">\t\t<section class=\"hds-related-articles padding-x-0 padding-y-3 desktop:padding-top-7 desktop:padding-bottom-9\">\n\t\t\t<div class=\"w-100 grid-row grid-container maxw-widescreen padding-0 text-align-left\">\n\t\t\t\t<div class=\"margin-bottom-4\"><h2 style=\"max-width: 100%;\" class=\"width-full w-full maxw-full\">Explore More<\/h2><\/div>\n\t\t\t<\/div>\n\t\t\t<div class=\"grid-row grid-container maxw-widescreen padding-0\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/directorates\/esdmd\/hhp\/space-radiation\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg 4096w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=150,150 150w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=300,300 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=768,768 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=1024,1024 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=1536,1536 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=2048,2048 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=50,50 50w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=100,100 100w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=200,200 200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=400,400 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=600,600 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=900,900 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=1200,1200 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/m7.3-flare.jpeg?resize=2000,2000 2000w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">4 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">Space Radiation<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t1 year ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/directorates\/esdmd\/hhp\/acoustics-and-noise-control\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg 4000w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?resize=300,225 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?resize=768,576 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?resize=1024,768 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?resize=1536,1152 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?resize=2048,1536 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?resize=400,300 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?resize=600,450 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?resize=900,675 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?resize=1200,900 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/hhp-acoustics-testing-jsc2011e036179.jpeg?resize=2000,1500 2000w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">2 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">Acoustics and Noise Control<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t1 year ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/directorates\/esdmd\/hhp\/microbiology\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg 3000w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?resize=300,225 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?resize=768,576 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?resize=1024,768 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?resize=1536,1152 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?resize=2048,1536 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?resize=400,300 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?resize=600,450 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?resize=900,675 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?resize=1200,900 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541641main-hhp-microbiology2-3000x2250-1.jpeg?resize=2000,1500 2000w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">3 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">Microbiology<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t1 year ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<\/div>\n\n<div id=\"no-dead-ends\" class=\"hds-topic-cards nasa-gb-align-full maxw-full width-full padding-y-6 padding-x-3 color-mode-dark hds-module hds-module-full wp-block-nasa-blocks-topic-cards\">\t\t<div class=\"grid-container grid-container-block-lg padding-x-0\">\n\t\t\t<div class=\"grid-row flex-align-center margin-bottom-3\">\n\t\t\t\t<div class=\"desktop:grid-col-8 margin-bottom-2 desktop:margin-bottom-0\">\n\t\t\t\t\t<div class=\"label color-carbon-60 margin-bottom-2\">Keep Exploring<\/div>\n\t\t\t\t\t<h2 class=\"heading-36 line-height-sm\">Discover More Topics From NASA<\/h2>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t<div class=\"grid-row grid-gap-2 hds-topic-cards-wrapper\">\n\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/humans-in-space\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Humans In Space<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"368\" height=\"560\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2021\/03\/topic-humans-in-space.jpg?w=368\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2021\/03\/topic-humans-in-space.jpg 368w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2021\/03\/topic-humans-in-space.jpg?resize=197,300 197w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2021\/03\/topic-humans-in-space.jpg?resize=263,400 263w\" sizes=\"(max-width: 368px) 100vw, 368px\" \/><\/figure>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/nasa-missions\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Missions<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"864\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?w=1536\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg 3840w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?resize=300,169 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?resize=768,432 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?resize=1024,576 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?resize=1536,864 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?resize=2048,1152 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?resize=400,225 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?resize=600,338 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?resize=900,506 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?resize=1200,675 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/08\/jsc2022e046413_orig.jpg?resize=2000,1125 2000w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/international-space-station\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>International Space Station<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"853\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?w=1536\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg 4343w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?resize=300,167 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?resize=768,427 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?resize=1024,569 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?resize=1536,853 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?resize=2048,1137 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?resize=400,222 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?resize=600,333 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?resize=900,500 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?resize=1200,666 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/02\/International-Space-Station-in-2021.jpg?resize=2000,1111 2000w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/?post_type=topic&p=192124\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Solar System<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Ensuring Astronaut Safety Achieving safe exploration of space in vehicles that rely upon closed environmental systems to recycle air and water to sustain life and are operated in extremely remote locations is a major challenge. The Toxicology and Environmental Chemistry (TEC) group at Johnson Space Center (JSC) is made up of 2 interrelated groups: Toxicology [...]<\/p>\n","protected":false},"author":38,"featured_media":207669,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nasa_hds_core_meta_l10n":"en-US","nasa_hds_core_meta_article_editor":"38","nasa_hds_core_meta_article_contacts":[],"nasa_hds_core_meta_article_topic":"260636","nasa_hds_core_meta_linked_locations":["283575"],"nasa_hds_core_meta_article_related_articles":["209715","212080","212095"],"hds_migrate_meta_pr_release_id":"","hds_migrate_meta_pr_release_type":"","nasa_hds_core_meta_location_x":"","nasa_hds_core_meta_location_y":"","nasa_hds_core_meta_gallery_images":[],"footnotes":""},"categories":[11377],"news-tags":[],"internal-terms":[10862,10260],"coauthors":[8394],"parsely":{"version":"1.1.0","meta":{"@context":"https:\/\/schema.org","@type":"NewsArticle","headline":"Toxicology and Environmental Chemistry","url":"https:\/\/www.nasa.gov\/directorates\/esdmd\/hhp\/toxicology-and-environmental-chemistry\/","mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/www.nasa.gov\/directorates\/esdmd\/hhp\/toxicology-and-environmental-chemistry\/"},"thumbnailUrl":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?w=150&h=150&crop=1","image":{"@type":"ImageObject","url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg"},"articleSection":"NASA Directorates","author":[{"@type":"Person","name":"Robert E. Lewis"}],"creator":["Robert E. Lewis"],"publisher":{"@type":"Organization","name":"NASA","logo":"https:\/\/www.nasa.gov\/wp-content\/themes\/nasa\/assets\/images\/nasa-logo.svg"},"keywords":["NASA Directorates","Exploration Systems Development Mission Directorate","Human Health and Performance"],"dateCreated":"2023-03-16T22:33:36Z","datePublished":"2023-03-16T22:33:36Z","dateModified":"2024-04-01T16:33:57Z"},"rendered":"<meta name=\"parsely-title\" content=\"Toxicology and Environmental Chemistry\" \/>\n<meta name=\"parsely-link\" content=\"https:\/\/www.nasa.gov\/directorates\/esdmd\/hhp\/toxicology-and-environmental-chemistry\/\" \/>\n<meta name=\"parsely-type\" content=\"post\" \/>\n<meta name=\"parsely-image-url\" content=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg?w=150&h=150&crop=1\" \/>\n<meta name=\"parsely-pub-date\" content=\"2023-03-16T22:33:36Z\" \/>\n<meta name=\"parsely-section\" content=\"NASA Directorates\" \/>\n<meta name=\"parsely-tags\" content=\"NASA Directorates,Exploration Systems Development Mission Directorate,Human Health and Performance\" \/>\n<meta name=\"parsely-author\" content=\"Robert E. Lewis\" \/>","tracker_url":"https:\/\/cdn.parsely.com\/keys\/nasa.gov\/p.js"},"read_time":5,"time_ago":"1 year","featured_image":{"id":207669,"file":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/03\/541736main-hhp-toxicology1-3000x2250-1.jpeg","title":"541736main-hhp-toxicology1-3000×2250","alt":"space toxicologist","caption":"A space toxicologist at NASA JSC."},"_links":{"self":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/207666"}],"collection":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/users\/38"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/comments?post=207666"}],"version-history":[{"count":32,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/207666\/revisions"}],"predecessor-version":[{"id":639486,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/207666\/revisions\/639486"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media\/207669"}],"wp:attachment":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media?parent=207666"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/categories?post=207666"},{"taxonomy":"news-tags","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/news-tags?post=207666"},{"taxonomy":"internal-terms","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/internal-terms?post=207666"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/coauthors?post=207666"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}