I am using GC-PDHID to check impurities in He by column MS5A 9ft 1/8 80/100 UM. i got two unknown peaks, one between oxygen and nitrogen and other peak between nitrogen and methane. could any one identify those peaks
I have updated the tags for better visibility . Do you have a screen capture that may help us see?
Attached is chromatogram
Hi, Identification of the peak like this is difficult as there should not be any peak between N2 and O2, please condition the MolSieve column at high temp around 350 over night and run carrier Blank to see the peaks.
if peaks is still there in Carrier blank also then it is possibly system contamination and need more conditioning of the column. if not then try to run the sample again. Which carrier gas you are using. Argon or Helium.
Retrieving data ...