Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

WAHT IS THE ELUTION ORDER IN GAS CHROMATOGRAPHY?

Micro Labs,

3 9375

what is the defferance between the potency and working standard

Matrix, Orchid, Caplin Point, Arbro Pharmaceuticals, ECOlogics, Venus Remedies,

1 3097

what is the principle involved in determination of moisture content?

3 7103




what is difference between assay&purity&potency?

5 23689

why we do the calibration of limit of stry light in hplc & uv

Cipla,

1343

what is leading peak in hplc

Cipla,

1 9635

what is difference between drug products and drug substance?

DRL,

5 74062

From peak purity spectrum, where or at which point peak purity angle & purity threshold is checked?

Cipla, MSN Pharma,

1 1527




how you determine moist.of NaOH sol or NaOH flacks

953

what is concentration of oxygen in U.H.P. grade N2 cylinder

1 2897

water is more polar than acetonitrile.but in reverse phase chromatography peaks elute earlier when we increse Acetonitrile.what is the reason.

Matrix,

10 34730

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 7052

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 me

Natco, Arch Pharmalabs,

3 7097

why use benzophenone & caffene acetone in hplc calibration

1 12085

why use k2cr2o7 , kcl h2so4 in uv calibration

GVK, DRL,

1 7085


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Un-Answered Questions { Analytical Chemistry }

IS THERE ANY EQUIPMENT TO CHECK AND CALCULATE THE POLARITY OF A LIQUID?

1187


A ha tc is actual defination of retention time?

178


how to calculate corelation coefficient in G.C Calibration? what is the calculation part?

911


how you determine moist.of NaOH sol or NaOH flacks

953


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

150






how to get accurate result for Residue on evaporation in purified water

222


Why do we use KMnO4 in the test of control of obsorbance ? and why do we take specific quantity i.e 57-63mg?

1236


Why Ethanol is Used for Standardization of GC Head space?

2564


Why potassium dichromate was using in Uv calibration?

186


How to determine water content of bis tetrazole amine mono ammonium salt

1854


WHAT IS DIFFERENCE B/W MALTINGRANG/DSC

1100


why are measure gas flow " ml " in Gas chromatography

291


why we are using hexane in calibration of number of drop per mL

183


Why potassium dichromate is used in calibration of uv?

230


Why only Copper standard is used to calibrate Atomic Absorption spectrophotometer?

1179