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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,

690

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

647

what is peak purity and its formula

663

Why potassium dichromate is used in calibration of uv?

839

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

590

What is difference between known and unknown impurities

Sun Pharma,

1 582

What is the difference between known and unknown impurities?

1 1357

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

608

Why to use propyl paraben in HPLC gradient calibration

Glenmark,

3091

Why potassium dichromate was using in Uv calibration?

1 1749

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

1 1157

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

690

How to define samples weight in moisture content

1 946

What is AV value in test uniformity content ,describe calculation

Lupin,

1 1382

Why perchloric acid used for potentiometric titration

1705


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Un-Answered Questions { Analytical Chemistry }

What is stray light in uv what are units for stray light

606


Why Ethanol is Used for Standardization of GC Head space?

3094


how a particular wavelength can be different for a particular compund while analysing by uv and by HPLC.

1450


what is third integration

1116


What is similarity factor and its use in api strength?

272






what is difference in ods I ods II is this is realy from sorbent / packing characteristics or from other means

1093


How to do regeneration of Metacarb Pb plus column?

1684


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

608


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

1224


what parameters we will consider while developing a HPLC method and how we confirm our HPLC method is valid?

2592


How to check hplc detecter sensitivity?

650


what is the structure of DOWEX-50

4361


What is third generation HPLC Columns?

1108


what is the principle involved in turbidometry and nephelometry ?

3122


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

633