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,

455

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

436

what is peak purity and its formula

417




Why potassium dichromate is used in calibration of uv?

589

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

409

What is difference between known and unknown impurities

Sun Pharma,

333

What is the difference between known and unknown impurities?

1 825

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

389




Why to use propyl paraben in HPLC gradient calibration

Glenmark,

1558

Why potassium dichromate was using in Uv calibration?

1 1093

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

1 730

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

440

How to define samples weight in moisture content

1 532

What is AV value in test uniformity content ,describe calculation

Lupin,

1 790

Why perchloric acid used for potentiometric titration

1484


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Un-Answered Questions { Analytical Chemistry }

from where i get mortar pastle for glass bottle crush? it's required for testing of it?

1040


How do we get end points and how many end points are possible for citric acid and di-acid not theorotically answer should be given practically.

1352


How can we detect a compound in hplc which does not have any chromofore?

25


why equlirium conatant of water have 14 value

1092


Ratio of Water and Acetonitrile(diluent) is not recommended to use in cleaning method validation,why?

1827






what is the structure of DOWEX-50

4014


How can we calculate offset value pH measurment

357


why disodium tartarate used in karl-fischer instrument ?.

915


Why perchloric acid used for potentiometric titration

1484


in dissolution in one tablets two molecule one is losartan & second is HCTZ losartam is complies in s1 stage & hctz is complies in s2 stage then how to report result losartan s1 stage result or losartan s2 stage result

1043


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?

6982


how the compound separate in coulunm,explain

1218


what is third integration

893


WHAT IS THE PARAMETER FOR THE SELECTION OF MOBILE PHASE IN HPLC?

25


What are modes of quantification in related substances

1080