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(ATOMIC ABSORPTION) Method Number: ID-121 OSHA …

METAL & METALLOID PARTICULATES IN WORKPLACE ATMOSPHERES (ATOMIC ABSORPTION) Method Number: ID-121 Matrix: Air, Wipes, or Bulks OSHA Permissible Exposure Limits: See Table 1 Collection Procedure: Personal air samples are collected on mixed-cellulose ester filters using a calibrated sampling pump. Wipe or bulk samples are collected using grab sampling techniques. Recommended Sampling Rate: 2 L/min Recommended Air Volumes Time Weighted Average Samples: 480 to 960 L Short-Term Exposure Limit Samples: 30 L Ceiling Samples: 10 L* Analytical Procedure: Samples are desorbed or digested using water extractions or mineral acid digestions.

either mixed cellulose ester (MCE) or polyvinyl chloride (PVC) filters. These samples are prepared in the laboratory using concentrated (concd) acids or extracted with deionized water if a soluble fraction is required. The sample solution is diluted to a known volume after any necessary matrix modifiers are added.

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