Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

WAHT IS THE ELUTION ORDER IN GAS CHROMATOGRAPHY?

Micro Labs,

3 9689

what is the defferance between the potency and working standard

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

1 3271

what is the principle involved in determination of moisture content?

3 7286




what is difference between assay&purity&potency?

5 24489

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

Cipla,

1 1491

what is leading peak in hplc

Cipla,

1 9827

what is difference between drug products and drug substance?

DRL,

5 76014

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

Cipla, MSN Pharma,

1 1645




how you determine moist.of NaOH sol or NaOH flacks

1020

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

1 2990

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

Matrix,

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 me

Natco, Arch Pharmalabs,

3 7246

why use benzophenone & caffene acetone in hplc calibration

1 12449

why use k2cr2o7 , kcl h2so4 in uv calibration

GVK, DRL,

1 7318


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Un-Answered Questions { Analytical Chemistry }

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

1936


How do we quantify crystaline and amarpous forms by using (NMR, XRD)spectroscopic techniques? Which any others instruments are useful for this quantification? explain

1153


Tell me something about Vitamin A test method by HPLC

1336


What is the calibration of uv process and preparation

697


how to calibrate hplc & gc

3105






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.

1144


How to choose concentration of LOQ solutions for RS analysis? Example.

769


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

195


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?

5824


are there in uv lamb that is chractrestic for wavelenghth 205 nm ?????

712


what is difference between UV - VISIBLE MODEL NO like 1600,1601,1700 etc ? plz explain me

1200


sop of a uv visible spectrophotometer double beam elico model

4156


What is control room temperature and which guide line says?

347


what type of question will ask in the interview of lab chemist.

2097


How to compare XRD graphs against standard and carry polymorpism study of API's by powder XRD method?

2563