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 Method 625
The USEPA method 625 method which utilizes a methylene chloride extraction of municipal or industrial wastewater, concentrated to 1-mL (in methylene chloride) and a gas chromatograph equipped with either a packed or capillary column to perform theseparation of acid and base-neutral extractable fractions. To detect the GC eluant, a mass spectrometer detector is used.
 

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