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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
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