International standard procedure for the extraction of metal compounds having soluble threshold limit values.
Appl Occup Environ Hyg 2001 Sep; 16(9):850-853
With the promulgation of ISO 152022, many of the questions raised in the article by Fairfax and Blotzer(1) have been answered. The extraction medium and experimental conditions for the dissolution of "soluble" metal compounds have now been specified in a new International Standard procedure. Industrial hygienists and other professionals in the occupational and environmental health arena should be aware of the portion of this new standard that describes sample preparation procedures for soluble metal compounds. If the field industrial hygienist wishes to sample for soluble metals, guidance is now provided by this new ISO standard for proper filter selection and subsequent sample preparation procedures. This standard has been sorely needed to ensure consistency and effectiveness in the extraction and analysis of soluble metal compounds from workplace air samples. Metallic elements for which soluble compounds have been assigned TLVs include: Aluminum (Al); Barium (Ba); Chromium (Cr); Iron (Fe); Molybdenum (Mo); Nickel (Ni); Platinum (Pt); Rhodium (Rh); Silver (Ag); Thallium (Tl); Tungsten (W); and Uranium (U). While this article has not discussed the analysis of "total" metals and metalloids, procedures for the determination of "total" metal content are also provided in the new International Standard.(2) The emphasis here has been on the description of the "soluble" procedure at this aspect was considered most important, due to the lack of standardized procedures for "soluble" metal compounds. It is hoped that through the use of ISO 15202-2, the occupational hygiene field will now be able to provide meaningful and consistent analytical results for soluble metal compounds in workplace air samples, and that significant disparities among laboratory results for such samples will be eliminated.
Sample-preparation; Air-samples; Standards; Analytical-methods; Metal-compounds; Particulates; Metalloids
Research Tools and Approaches
Applied Occupational and Environmental Hygiene