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what is concentration of oxygen in U.H.P. grade N2 cylinder1 2990
water is more polar than acetonitrile.but in reverse phase chromatography peaks elute earlier when we increse Acetonitrile.what is the reason.10 35521
I got 88.0 % assay for a drug in HPLC analysis for same injection i got 40.0% related substances is it possible? what is the relation between results of assay and purity?5 7210
hi i am m.sc organic chem and complete analytical lab tech dipolma now job in qc many time ask question you in m.sc organic why job in qc please help me i can not give proper ans please tell me3 7246
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How to determine water content of bis tetrazole amine mono ammonium salt
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Tell me something about Vitamin A test method by HPLC
What is the calibration of uv process and preparation
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1)What's the meaning of Absorption,give a example. 2)What's the meaning of Adsorption,give a example. 2)what is the difference between Absorption and Adsorption.
How to choose concentration of LOQ solutions for RS analysis? Example.
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 the principle of HPLC, GC, LCMS, GCMS,LC QQQ, GC QQQ, LC Q TOF and GC Q TOF. What are the applications and Specificity?
are there in uv lamb that is chractrestic for wavelenghth 205 nm ?????
what is difference between UV - VISIBLE MODEL NO like 1600,1601,1700 etc ? plz explain me
sop of a uv visible spectrophotometer double beam elico model
What is control room temperature and which guide line says?
what type of question will ask in the interview of lab chemist.
How to compare XRD graphs against standard and carry polymorpism study of API's by powder XRD method?