Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

please explian me about area normalisation method,diluted standard method,impurity vs impurity and which one has to be selected in method development

Pfizer,

1064

How they found 1mL of K.F reagent is equivalent to 5mg of water and if we change the composition of K.F reagent, is it can neutralize more amount of water?

1248

How can we calculate offset value pH measurment

Dr Reddys,

1031

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

Dr Reddys,

988

Colorimtry

Dr Reddys,

1138

What are usp limits for theoritical plats,resoution,tailing factor,peak to valley ratio

Dr Reddys,

1301

What are usp limits for total impurities,unknown impurity

Dr Reddys,

1 2888

how to get accurate result for Residue on evaporation in purified water

1083

Why acetonitrile and water are used as extraction solvent when analysis melamine? I thought they are miscible and won't be able to separate...

1178

In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?

1415

could negative ions be produced by bombardment process in mass spectrometry?

1252

A ha tc is actual defination of retention time?

1032

How to check hplc detecter sensitivity?

Gland Pharma,

1 1437

(0.41)d what is d?

Gland Pharma,

1 1999

How to estimate potassium?

1 1384


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Un-Answered Questions { Analytical Chemistry }



1785


How can we confirm the HPLC column is end-capped or not? Is it possible to identify by physical appearance?

2685


what is difference between UV - VISIBLE MODEL NO like 1600,1601,1700 etc ? plz explain me

2182


How to set specification of assay, fisdolution and related substances?

326


in OSD forms require to use gas chromatography?

306






How to calculation of residual solvent methanol (3000 ppm) standard solution, and how many quantity used of test sample

2484


if rsd failed then what require to do?

292


What are the primary considerations in extractables and Leachables ?

1747


what is mean by nitrosamine impurities?

506


How require to perform linearity as per ANVISA? What are the acceptance criteria?

660


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

606


please explian me about area normalisation method,diluted standard method,impurity vs impurity and which one has to be selected in method development

1064


what is the procedure for cleaning of lenses of hatr accesory of ftir instrument?

1770


how you confirm the assay method?

264


if tech transfer fails whay require to do?

295