What is Radiello Working News Bibliography Search About us Contacts IT High uptake rate radial diffusive sampler suitable for both solvent and thermal desorption 15 November 2019 Cocheo, V., Boaretto, C., Sacco P. American Industrial Hygiene Association Journal, 1996, 57, 897-904 A new diffusive sampler with radically changed diffusive path geometry was developed. The small cylinder has a height greater than its radius; the diffusive surface is the external cylindrical one, and the adsorber is a coaxial inner cylindrical cartridge. Due to the high value of diffusive area-path length ratio and to the high loading capacity of the adsorber (up to 80 mg for ethyl acetate), this original geometry allows high and constant sampling rates in a wide range of concentrations and exposure times. The cylindrical shape of the cartridge enables both thermal and solvent desorbing as well as active sampling. Using activated charcoal, exposure time can range from 30 minutes to 24 hours, thus allowing monitoring both in the workplace and in the outdoor environment. As an example, the 80 cm3/min uptake rate of benzene assures a detection limit as low as 2 µg/m3 after 24-hour exposure time. The uptake rate for 32 organics was measured experimentally, and results were found to be highly reproducible and unaffected by wind speed and airborne mixture composition. Useful links F.A.Q. Service / Lab Documentations Certificates ICS Maugeri SpA SB è certificata secondo la UNI EN ISO 9001:2015 da Bureau Veritas Italia SpA Registered office: Via Salvatore Maugeri, 4 - 27100 - Pavia - C.F. e P.IVA 02631650187 - cod. univoco fatt. elettronica: MZO2A0U

What is Radiello Working News Bibliography Search About us Contacts IT Atmospheric volatile organic compound monitoring. Ozone induced artefact formation 15 November 2019 Bates M.S., Gonzalez-Flesca N., Sokhi R., Cocheo V. Environmental Monitoring and Assessment, 2000, 65, 89-97 Assessment of population exposure to VOC in ambient atmospheres is receiving heightened interest as the adverse health effects of chronic exposure to certain of these compounds are identified. Active (pumped) and passive samplers are the most commonly used devices for this type of monitoring. It has been shown, however, that these devices, along with all other pre-concentration techniques, are susceptible to ozone interference. It is demonstrated that this interference occurs even at low ozone concentrations and that it may result in the under-estimation of population exposure. A convenient and effective ozone scrubbing method is identified and successfully applied and validated for both active and passive samplers for a range of VOC. Useful links F.A.Q. Service / Lab Documentations Certificates ICS Maugeri SpA SB è certificata secondo la UNI EN ISO 9001:2015 da Bureau Veritas Italia SpA Registered office: Via Salvatore Maugeri, 4 - 27100 - Pavia - C.F. e P.IVA 02631650187 - cod. univoco fatt. elettronica: MZO2A0U