what is difference of uv and pda
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Answer Posted / t jagadeeswara reddy
PDA Detector- by using this detector we can analyse the
unknown sample(whose wave length was not known) in the range
of 190 to 800nm.
UV Detector- By using this we can analyse the sample(whose
wave length was known) by fixing its wavelength to the
particular value.
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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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