Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

In Analytical method development related substance method when did follow w/w method when did follow area normalisation method

Dr Reddys, Sun Pharma,

2 12898

In Analytical method development related substance method when did follow w/w method when did follow area normalisation method

5 14332

why a ph meter require KCL solution for their storing condition?

Aurobindo,

1 41241

What is Signal to noise ratio?

3 12163

what is the importence and role of LCMS and LCMS/MS and their applications? which type of compounds are analysis by lcms?

GVK, Millennium,

3084

I have 1 gram of Diphenylamine and want to make a 10,000 or 1000 ppm solution in methanol. How do I make this?

Midas Technologies,

9 13689

Why forced degradation studies are performed in hplc method validation?

Apex,

6 23404

why base line not starts from zero in gc?

Aurobindo, FDC, Reddy Labs,

1 9297

how to regulate noise in HPLC?

Alkem Labs, Vimta Labs,

2 6380

What is split

Vimta Labs,

4 11462

What is the purpose & importance of using the polystyrene film in ir calibration?

Vimta Labs,

3 12203

Why do we use KMnO4 in the test of control of obsorbance ? and why do we take specific quantity i.e 57-63mg?

Reddy Labs, Vimta Labs,

2280

why 1.2%kcl solution is using in limit os straylight?and why this test used for uv calibration?

Graviti Pharmaceuticals, Reddy Labs, Vimta Labs,

1 7189

why 0.02% solution toluene &noHexane using in uv calibration?

Graviti Pharmaceuticals, Orbit Pharma, Ranbaxy, Vimta Labs,

1 7882

what is the peak purity concept?

Graviti Pharmaceuticals, Vimta Labs,

5 26131


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Un-Answered Questions { Analytical Chemistry }

in api coa contains only process impurities and in product coa contains degradation impurities?

295


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

2447


How do we get end points and how many end points are possible for citric acid and di-acid not theorotically answer should be given practically.

1996


what is third integration

1470


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

1872






As per ICH related substances stability trend limit from initial to shelf life

2632


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

1081


Why to use propyl paraben in HPLC gradient calibration

6012


why we should take dst factor for below 1%moisture samples

2177


process of Diclofenac sodium,IP.

1644


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

2256


What is viod volume and peak purity in HPLC?

2309


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

1307


why glutent are detected in the rice cereal baby food product even manufacturer claimed that they are using rice and milk only?we have using ELISA to do the test,and rice supposed not containing any glutent,rite?We already repeat the test so many times and it still detected.just wondering where the glutent came from?

2315


Please tell me about the pH of Polycaboxylic ether is it in the 5-6 range ever or more than 6

2085