EPA Method 504.1


I am attempting to validate this method on a GC-ECD 6890 Series.  This method has 3 analytes, when I run the standard that i have with all 3 analytes I only see peaks for 2 of them.  I ordered the standards separately in order to identify the peaks and it is going to take a little while for them to come in.  I set up the conditions exactly how the method stated it to do.  Can anyone advise on what I may be doing wrong in order to not see all 3 analytes?  I played with the method a little bit and made the run time longer and still no 3rd peak.  

Thanks in advance.

  • Hi

    Check page # 20 onwards about EPA 504.1

  • Thank you I was able to get the 3rd peak!!!

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