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Laboratory Analysis, Transfer of Custody and Transportation to Laboratory

Laboratory Analysis, Transfer of Custody and Transportation to Laboratory. John Wondolleck, CDM October 12, 2010. Laboratory Analysis. Detection limits Cleanup to background translates to very low chemical concentrations for some parameters

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Laboratory Analysis, Transfer of Custody and Transportation to Laboratory

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  1. Laboratory Analysis, Transfer of Custody and Transportation to Laboratory John Wondolleck, CDM October 12, 2010

  2. Laboratory Analysis • Detection limits • Cleanup to background translates to very low chemical concentrations for some parameters • A key constraint is the ability of a laboratory to “see” concentrations at low levels • Rural residential risk based screening levels have not been developed, • Laboratories were asked to propose detection limits that were 2 orders of magnitude below the suburban residential risk based screening levels

  3. Proposals from Laboratories • Initially laboratories were asked to provide information that described for each analysis their capability to detect as low as possible • After the initial responses, CDM asked the laboratories to respond with their potential contractual detection limits

  4. Why was there such a wide variation in the responses from the laboratories? • Most Method Detection Limits (MDLs) are laboratory specific and developed per procedures in 40CFR • EPA’s SW-846 and other method publishers do not provide specific MDLs for the analytes, they do in some cases provide a quantification limit that is achievable if the method is followed as written • The MDLs on the table were provided by five laboratories in their response to CDM’s solicitation • Also included is a “typical” MDL observed by CDM chemists based on experience with labs

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