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      What is the difference between an Internal Standard and Surrogate?

      April 1, 2021 at 1:00 PM / by Michael Ebitson posted in epa method 525.2, water extractions, Internal Standard, Surrogate

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      Have you ever worked with new methods and said to yourself “yes I know what these internal standards and surrogates are measuring and when to add them to the samples”? Sounds familiar right? Well, I remember when I first started working in the laboratory and needed to fully understand and follow all method protocols and standard operating procedures (SOPs). One of the questions I asked was, what is the difference between method 525.2 and its internal standard and surrogates versus every other method we extract and analyze?

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