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Mining Publication: Field Method for the Determination of Insoluble or Total Hexavalent Chromium in Workplace Air
Keywords: Chemical analysis Chromium Fumes Inhaling harmful substances Sampling
Original creation date: September 2004
Authors: KJ Hazelwood, PL Drake, KE Ashley, AD Marcy
Peer Reviewed Journal Article - September 2004
Download PDF Document (0.10 MB)
NIOSHTIC2 Number: 20025410
J Occup Environ Hyg 2004 Sep; 1(9):613-619
National Institute for Occupational Safety and Health method 7703 is a portable field procedure for the analysis of workplace air filter samples for hexavalent chromium (CrVI) content immediately after the samples are collected. The field method prescribes CrVI extraction from air filter samples with an ammonium sulfate/ammonium hydroxide extraction buffer using ultrasonic extraction (UE). Strong anion-exchange solid-phase extraction (SAE-SPE) is then used to separate CrVI from trivalent chromium and other interferences. Portable spectrophotometric measurement of CrVI is then conducted using the 1,5-diphenylcarbazide (DPC) method. However, it has been found that the ammonium extraction buffer does not adequately bring insoluble CrVI compounds into solution during the UE process. Thus, it was deemed necessary to modify the field method so that it would provide acceptable recoveries for insoluble CrVI compounds. To this end, a more alkaline extraction solution - sodium carbonate/sodium bicarbonate buffer - was investigated. The modified procedure using the highly alkaline extraction solution was demonstrated to be compatible with SAE-SPE cartridges when determining insoluble CrVI in air filter samples. It was found that the carbonate/bicarbonate buffer was equally effective for complete dissolution of both insoluble and soluble forms of CrVI. Furthermore, the modified procedure met desired performance criteria established for air sampling and analytical methods.
Image of publication Field Method for the Determination of Insoluble or Total Hexavalent Chromium in Workplace AirPeer Reviewed Journal Article - September 2004
Download PDF Document (0.10 MB)
NIOSHTIC2 Number: 20025410
J Occup Environ Hyg 2004 Sep; 1(9):613-619
See Also
Benchmarking Longwall Dust Control Technology and Practices
Characteristics of Fugitive Dust Generated from Unpaved Mine Haulage Roads
Determining the Spatial Variability of Personal Sampler Inlet Locations
Evaluation of Sequential Extraction Procedures for Soluble and Insoluble Hexavalent Chromium Compounds in Workplace Air Samples
A Handheld Electrostatic Precipitator for Sampling Airborne Particles and Nanoparticles
Instrumentation for Diesel Particulate Matter Emissions Research
A Review of Occupational Silica Exposures on Continuous Mining Operations
Rock Dusting Considerations in Underground Coal Mines
Sonic Anemometer Airflow Monitoring Technique for Use in Underground Mines
Use of Vacutainers for Collection of Mine Atmosphere Samples
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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