Answer Posted / venkat.1830@gmail.com
acidic compounds are more retained at low ph ,basic
compounds are more retained at higher ph while neutral
compounds are uneffected. PH can be used as a powerful
selectivity tool for the separation of ionizable
compounds.At PH values used traditionally (PH 4-8 or
depending upon column specifications ),a change in PH can
result in a dramatic shift in retention
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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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