what is difference between zero air gas and o2 gas
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Zero air-Air contains hydrocarbon limit less than 0.10 ppm is zero air.
Above the 0.10 ppm is pure air i.e o2 gas.
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My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards
Organic Chemistry 
