which solvent is highest poler
acetonitrile
dimethyl formamide
methanole
tetrahydrofurane
buffer solution
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Tell me something about Vitamin A test method by 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
What is gelatinization?
we can use expired sample for validation and analyst qualification?