Answer Posted / sanjay kumar

residue of ignition and sulphated ash terminology is same
but as ignition time no sulphuric acid is add during
ignition test
but in sulphated ash first ignite the sample at suitable
temperatur then added 1 ml sulphuric acid & ignite suitable
temperature as per IP,BP&USP

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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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