National Institute for Occupational Safety and Health

“ The working range of this method is up to 100 mg/m3 for each element in a 500-L sample (the minimum range depends on the LOD for each sample; see Table 1) . The analysis is not compound specific. Certain elemental compounds are known to be acceptable or unacceptable by this method (see Table 3) . For unverified compounds, a test run should be conducted using a known amount of the compound in question to determine acceptability. ”

“ Value based on a 25-mL sample volume. The minimum sampling volume needed to obtain the OSHA PEL at the LOQ for the element/compound at a sample digestion volume of 25 m L. The m aximum sampling volume for a given sample, calculated by taking 50,000 :g as th e lim it for the element/compound per sample. NOTE: The LOD and LOQ values are dependent on the particular analytical instrument used. ”

“ The method procedure is not suitable for samples at any weight with recoveries of between 90 and 110 percent. An alternative method should be used.
Valid up to 10,000 :g/sample and within 7 days of sample digestion. Va lid up to 50,000 :g/sample and at least 2 4 ho urs after s am ple digestion ; Valid up to 15,000 :g/s am ple within 24 hours of sample digestion. Valid up to 25,000 :g/sample and within 7 days of sample digestion. Valid up to 25,000 :g/sample and within 7 days of sample digestion. Valid up to 30,000 :g/sample and within 7 days of sample digestion. ”