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,

540

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

513

what is peak purity and its formula

512

Why potassium dichromate is used in calibration of uv?

689

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

479

What is difference between known and unknown impurities

Sun Pharma,

422

What is the difference between known and unknown impurities?

1 1069

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

477

Why to use propyl paraben in HPLC gradient calibration

Glenmark,

2086

Why potassium dichromate was using in Uv calibration?

1 1377

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

1 934

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

516

How to define samples weight in moisture content

1 687

What is AV value in test uniformity content ,describe calculation

Lupin,

1 1044

Why perchloric acid used for potentiometric titration

1573


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Un-Answered Questions { Analytical Chemistry }

Qc interview questions

685


How to determine the EDTA content by potentiometry titration in Ceftriaxine sodium

1327


how to select short coloum and long coloumn for new molecule

1293


pharma industries oriented

1098


What is diffrence between extractable volume and deliverable volume? Answer pls

1924






In Dissolution Test why limit is define Q+5% what is the role of +5%.

1860


How will u perform degradation study in detectors other thann PDA in HPLC Methodology

1477


WHAT IS THE USE OF STARTER ?????????

1337


acceptance criteria for lod & loq by standard deviation of response and slope??

1449


What is the limit for single maximum impurity limit as per USP??

66


2. Two grams of Benzoic acid are dissolved in 200 ml of water and extracted with 200 ml of diethyl ether. The distribution coefficient of benzoic acid is 100, and its dissociation constant is 6.5 10-5. Calculate the distribution ratio (D) of benzoic acid at pH 2, 5, and 6. 3. Calculate D at pH 2 to 10 (1 unit apart) in the above problem, and plot D versus pH.

1132


what type of questions asked on analytical balance and also give answers................all pharma companies?

7902


Difference between the quantitative analysis and qualitative analysis?

8


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?

7175


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

479