EPA Method 204a - Volatile Organic Compounds in Liquid Input Stream

Method Overview

  • At least 3 sampling runs
  • Runs should be between 3 to 8 hours long
  • Each run should be covering one complete production cycle.
    • Unless product cycle is longer than 8 hours
  • The amount of VOC containing liquid introduced to a process is determined as the weight difference of the feed material before and after each sampling run. The VOC content of the liquid input material is determined by volatilizing a small aliquot of the material and analyzing the volatile material using a flame ionization analyzer (FIA). A sample of each VOC containing liquid is analyzed with a FIA to determine the volatiles content.

Target Compounds

  • Total VOC
  • FIA Response Factor to each feed stream input

Performance Tips

  • Amount of VOC containing liquid in the process determined using feed material before and after each run.
  • VOC content determined by analyzing an aliquot using a flame ionization detector (FID).


  • Samples may qualify to be shipped as a hazardous material. Please call for IATA codes if you need them.


  • The most useful data are determining the response factor of a given feed stream on an FIA (Total Hydrocarbon Analyzer).
  • Direct conversion factors, from propane to feed stream, can be determined
    • Units = lb Feed Stream per lb Propane (or Methane)


  • No, please contact us if you are interested!

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