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Answer Posted / ramakrishna,micro labs
Based on mobile phase negative peaks we observed,for ex: the mobile phase having TEA,Acetic acid or OPA (those all r used for mobile phase pH adjustment) .that type of chemicals will show negative response in HPLC
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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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