What is the current holding time for samples collected in the EnCore sampler and analyzed using Method 5035?
Between the time that Method 5035 was proposed and when it was promulgated, EPA reviewed data from the manufacturer of the EnCore device. Those data suggested that samples could be held in the EnCore device for 48 hours without significant loss of volatile analytes. Subsequent data for freezing samples in the EnCore sampler also indicates a 48-hour limit without significant loss. Therefore, as noted in Sec. 6.2.1.8 of the promulgated version of Method 5035, samples may be held for up to 48 hours before analysis, or before transfer to the glass vials used for the closed-system purge-and-trap device in the method. The overall holding time for the sample remains 14 days from collection to analysis.
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