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      Are Your Proficiency Testing Results Failing for Method 1664?

      December 14, 2020 at 3:01 PM / by Michael Ebitson posted in SPE solid phase extraction, LLE liquid-liquid extraction, tech tips, oil and grease, epa method 1664b, proficiency testing

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      It is that time of year again when laboratories are fulfilling accreditation requirements for the methods that they offer. One of the requirements that must be met for each method is called proficiency testing (PT).

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