Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

When i inject amines and acid on HPLC then which peak will elut first?

Sun Pharma,

4 8935

In pharmacopeal solibility parameter of a material, is et essential to test all paramete? If 70-75% parameter passes can we assess that the material is satisfactory or not?

Aurobindo,

1 3168

Why triethylamine and o-phosphoric acid used while setting pH of mobile phase during HPLC Analysis?

Hapten Healthcare, Pharmaceutical,

6 22206




why RID detector is used for selective materials like Mannitol, Hydroxyethyl Starch and Sorbitol?

5 7207

for which type of applications gas chromatography is used?

2 3996

for which type of applications gas chromatography is used?

2 4002

for which type of applications gas chromatography is used?

Cipla, Flamingo Pharmaceuticals,

5 7245

wat is reverse phase in hplc

2 6058




For Dissolution test why we are Performing 6 Bowls why not more.any were mentioned or in what basis we are performing? --------Veerabhadrarao.M

Lee Pharma, Micro Labs,

2 8413

In Number of Theoretical Plates (N) = 16 (tr/w)2. where tr: retention time, and W: peak width. My Question is here in formula what is 16.Can u explain briefly? ---Veerabhadrarao.M

Sun Pharma, Micro Labs, Richter Themis,

3 13760

how to Calibrate FID IN GC

1 5020

what is assay in hplc

3 7786

how calibrate the hplc detector

Cipla, Shraddha Analytical Services,

2 7719

why we use deturium lamp in uv spctrophotometer other than lamps

1 7492

A new drug substance found fail to meet specification for an unknown Impurity during stability study(Specific change),how would further proceed?

2 4535


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Un-Answered Questions { Analytical Chemistry }

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

2323


While performing TOC sst analysis Zero shift disabled & sample analysis zero shift enabled why?

1036


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

1330


using gradient pressure in gas chromatography are not ?using gradient pressure why

2148


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

892






how to calibrate hplc & gc

3126


How to calculate coreletion coefficient

13


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

259


How to start the dissolution development for unknown tab?

327


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

1873


I have compare C2H2-air and C2H2-N2O flame AAS on determination calcium. Both use same range of std to plot calibration curve. (2-6ppm) When i measure the sample with phosphate, KCl and LaCl, C2H2-N2O flame give false positive result, around 0.5ppm. When i measure the sample with phosphste, KCl and EDTA. C2H2-N2O flame also give 0.5ppm false positive. But both above mentioned sample would not give false positive when measured by C2H2-air flame. What is the reason?

2101


cefoperozone and sulbactam inj. hplc test method

1298


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?

1311


why we are using benzene, anyline in acetic anhdride assay titration method?

846


How to check hplc detecter sensitivity?

261