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,

330

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

279

what is peak purity and its formula

295




Why potassium dichromate is used in calibration of uv?

416

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

333

What is difference between known and unknown impurities

Sun Pharma,

233

What is the difference between known and unknown impurities?

1 508

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

303




Why to use propyl paraben in HPLC gradient calibration

Glenmark,

967

Why potassium dichromate was using in Uv calibration?

1 724

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

1 473

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

298

How to define samples weight in moisture content

1 304

What is AV value in test uniformity content ,describe calculation

Lupin,

1 508

Why perchloric acid used for potentiometric titration

1388


Post New Analytical Chemistry Questions






Un-Answered Questions { Analytical Chemistry }

How to determine water content of bis tetrazole amine mono ammonium salt

2059


USP methodology, EP methodology, IP methodology, among three if possible to use one methodology for qualify working standard to use USP, EP, IP ? Please explain...

649


What is Band broading effect explain

645


AT WHAT CONDITIONS WILL YOU ANALYSE A SAMPLE,WHICH ARE PRESERVED AT OTHER THAN THE AMBIENT CONDITIONS?(ie COLD STORAGE SAMPLES BELOW 20* CENTIGRADE?

913


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

330






What is the purpose of octyl silane columns?

2813


Why dissolution test is not performed in all of the products

1258


A ha tc is actual defination of retention time?

302


what type of question will ask in the interview of lab chemist.

2180


WHICH STANDARD WE USE IN SILICA ANALYSIS IN SILICA-GEL METHOD FOR SOLID SAMPLE

935


Describe your field experience sample type collected,sample techniques,field measurements taken and equipment used?

1529


can i use hplc detector to uplc and why?

1032


WHAT IS THE CRITERIA FOR SELECTION OF TIME OF DISSOLUTION AND THE MEDIUM OF DISSOLUTION?

1447


mahagenco syllabus for the post of chemist

4976


cefoperozone and sulbactam inj. hplc test method

1342