NDLI: Development of a proposed International Standard for determining arsenic in workplace air using hydride generation atomic absorption spectrometry

Content Provider	Royal Society of Chemistry (RSC)
Author	Howe, Alan M. Foster, Robert D.
Copyright Year	1994
Abstract	Proposed Draft International Standard DIS 11041, described and developed by the International Organisation for Standardisation (ISO), involves sampling air by drawing it though a membrane filter with a paper back-up pad, both of which have been treated with sodium carbonate solution. Particulate arsenic compounds and arsenic(III) oxide vapour are collected, but not arsine. The filter and pad are digested using nitric acid, sulfuric acid and hydrogen peroxide. The resultant solution is boiled down to sulfuric acid fumes and then made up to volume with water. Aliquots of the sample solution are prepared for hydride generation by the addition of hydrochloric acid and potassium iodide. Analysis by both continuous flow and flow injection hydride generation atomic absorption spectrometry (HG-AAS) is described. The method exhibits a recovery of > 95%. It can be adapted to determine nanogram to milligram levels of collected arsenic, making it suitable for testing compliance with the widely differing limit values stipulated in government health legislation of different countries, e.g., 0.1 mg m–3 UK Maximum Exposure Limit (MEL), 0.01 mg m–3 US Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (PEL) and 0.002 mg m–3 US National Institute of Occupational Safety and Health (NIOSH) Short Term Limit Value. The International Standard will supplement existing internationally adopted analytical standards, such as NIOSH 7901 which employs electrothermal atomic absorption spectrometry, and NIOSH 7900, which employs HG-AAS but which for safety reasons requires the use of a fume cupboard suitable for handling perchloric acid. It should be useful to a wide range of laboratories, including those with limited AAS facilities. This paper describes the testing protocol used to validate the method and gives results obtained to date, including some obtained by laboratories using the analytical method in an inter-laboratory exercise.
Starting Page	273
Ending Page	280
Page Count	8
File Format	PDF
ISSN	02679477
Volume Number	9
Issue Number	3
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/JA9940900273
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	International Organisation for Standardisation ISO US Occupational Safety and Health Administration OSHA US National Institute of Occupational Safety and Health NIOSH International Standard UK International Organization for Standardization Membrane technology Sodium carbonate Arsenic Arsine Acid Peroxide Hydride Potassium iodide Absorption spectroscopy Orders of magnitude (mass) Maximum Exposure Occupational Safety and Health Administration Permissible exposure limit National Institute for Occupational Safety and Health Fume hood
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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