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,

1263

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

1077

what is peak purity and its formula

1 1412

Why potassium dichromate is used in calibration of uv?

1338

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

959

What is difference between known and unknown impurities

Sun Pharma,

1 1529

What is the difference between known and unknown impurities?

1 2273

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

1140

Why to use propyl paraben in HPLC gradient calibration

Glenmark,

5998

Why potassium dichromate was using in Uv calibration?

1 2692

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

1 1891

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

1275

How to define samples weight in moisture content

1 1672

What is AV value in test uniformity content ,describe calculation

Lupin,

1 2211

Why perchloric acid used for potentiometric titration

2127


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Un-Answered Questions { Analytical Chemistry }

WHY given much noise PDA dector then VWD Dector

1473


in gas chromatography what is the difference between gas flow rate and average linear velocity ?

1886


why salisylic acid not using now days for disdolution calibration?

268


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

2443


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

1275






how require to fix the linearity and accuracy cincentration range?

591


In BP2013, Loperamid HCl monograph. Assay by titration with 0.1N sodium hydroxide using hydrocloric acid 0.01N and reading the volume added between the 2 points of inflexion. I have a question that if the diluent solvent is ethanol is certainly consumed a amount of volume of titrant, so this volume must be eliminated on the result calculation or not apart from first point which is subtracted above.

2568


What is importance of pH in the Heavy metal test and How it effect on the test results?

1708


Which parameters require to do in tech transfer?

240


Why potassium dichromate is used in calibration of uv?

1338


How do we fix the sample concentaryion in hplc method development. What is the basis?

646


What is split ratio in Gc? Splitless? how requirr to select?

296


In Assy by potentio metry titration method how select MET U ,DET U, SET U,

1272


What is shaking level in GC?

298


Why sodium hydroxide used for maintain pH of phosphate buffer

1798