Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

1.What is the difference between method validation and method verification 2.Which guidelines proposed to method transfer

Granules,

389

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

367

what is peak purity and its formula

367




Why potassium dichromate is used in calibration of uv?

507

Why sometime potassium ortho phosphate mix with acetone use for sample preparation for hplc

383

What is difference between known and unknown impurities

Sun Pharma,

292

What is the difference between known and unknown impurities?

1 676

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

355




Why to use propyl paraben in HPLC gradient calibration

Glenmark,

1298

Why potassium dichromate was using in Uv calibration?

1 944

%lod always grater than %water content for same product??

1 619

We use Potassium Dichromate solution for the calibration of UV-Visible Spectrophotometer in UV region. My question is to calibrate visible region which solution could be used in photometric accuracy

396

How to define samples weight in moisture content

1 454

What is AV value in test uniformity content ,describe calculation

Lupin,

1 667

Why perchloric acid used for potentiometric titration

1439


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Un-Answered Questions { Analytical Chemistry }

why equlirium conatant of water have 14 value

1039


why we use Dichlorobenzene.nitrobezine.t-butyldi sulhate.for calibration of gc Head space

1070


what is peak purity and its formula

367


mahagenco syllabus for the post of chemist

5025




1176






what is impurity profile. how to interpret this impurity profile to a drug product or drug substance.

1282


Colorimtry

343


In HPLC Calibration, On which basis RSD Limit of noise test is fixed (NMT 33.0 % )

2135


how the compound separate in coulunm,explain

1180


explain 5 components of gas chromatography ?

786


What is gelatinization?

545


What are usp limits for theoritical plats,resoution,tailing factor,peak to valley ratio

460


is it necessary to do HPLC calibration at wavelength 315nm if we are doing analysis at this wavelangth

729


What is the difference between purge septum flow and column flow in gas chromatography?

903


what is the importence and role of LCMS and LCMS/MS and their applications? which type of compounds are analysis by lcms?

2414