![]() ![]() Studies indicate that the loss exceeded 10% after seven days. Storage stability tests showed that these samples were not stable for longer periods of time. However, Cr(VI) samples collected from welding operations must be analyzed within eight days of sampling in accordance with OSHA ID-215 to minimize the effects caused by the interaction of Fe(II) and Cr(VI) to form Cr(III). NIOSH Analytical Method 7605 is comparable to OSHA Method ID-215.Ĭr(VI) samples collected on PVC from welding operations do not require field stabilization as with Cr(VI) samples collected from other operations (such as samples collected during chromium plating operations). The recommended flow rate is 2.0 liters per minute for 480 minutes (i.e., 960 liters). This method involves collecting an air sample onto a 5.0 micron polyvinyl chloride (PVC) membrane mounted in a 37-mm or 25-mm polystyrene cassette holder. ![]() OSHA specifically references exposure monitoring to be performed using OSHA Method ID-215 (or equivalent). Sampling and Analytical MethodsĮxposure monitoring should be performed using a sampling method that is at least ☒5% accurate. This paper describes sampling and analytical methods for Cr(VI) and considerations when conducting exposure monitoring for Cr(VI). Additionally, exposure monitoring must be performed whenever there is a change in work processes or materials that may result in new or additional exposures to Cr(VI). For exposures that are determined to be at or above OSHA’s Action Level of 2.5 μg/m3 (8-hour TWA), exposure monitoring must be performed every six months. For exposures that are determined to be at or above OSHA’s PEL of 5 micrograms per cubic meter (μg/m3) (8-hour TWA), exposure monitoring must be performed at least every three months. If the scheduled monitoring option is used, exposure monitoring must be performed initially and periodically. If objective data is used, the data must reflect workplace conditions closely resembling the processes, types of material, control methods, work practices, and environmental conditions. Options for exposure determinations include initial and periodic exposure monitoring and/or the use of objective data. OSHA requires employers to determine Cr(VI) exposures to employees. ![]()
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