Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

Difference between uv detector nd RI DETECTOR? wt s the difference between OVI Solvents nd residual solvents incase of GAS CHROMATOGRAPHY? nd wt s its detection limit?

3 10393

on what basis SOP's can be changed? IF mobile phase ratio is 70:30 to how much % can we change the ratio in HPLC process

Cipla, Ranbaxy,

7 10629

Why caffeine as a reference standard used for calibration of HPLC?

Orchid, Gangwal Chemicals,

11 40621

What is the composition of K.F


6 31972

What should be the precision for HPLC during technology transfer?

3 5979

how do start hplc method development? how much sample required for developing the method development?

BMS, Indoco Remedies, Sun Pharma, Cipla,

3 38904

Wt s the use of linearity in HPLC method validation

4 10717

which pharmacopeoia mentions that caffiene is used as a standard for HPLC calibration? which other standardscan be used for the same?

Hetero, Mylan,

1 4841

Why will a solution of aspirin without acid or basic hydrolysis give yellow colour with a solution of Ferric chloride?

1 3498

Why do we use 0.005M h2so4 solution for preparation of k2cr2o7 solution for UV calibration?

Medreich, Jubilant, Mylan,

3 18484

In HPLC what is Single point threshold, peak purity index and minimum peak purity index? what should be consider for pure peak.

3 20844

why the sucrose used in calibration of polarimeter


5 10569

what r the parts calibrated in gc

Reddy Labs, ELBS,

21 20266

acceptance criteria for ph meter, hplc detector,pump,injector,oven when we calibrate.

3 17814

is there any material other than caffene to calibrate hplc detector


12 16586

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Un-Answered Questions { Analytical Chemistry }

what is weight veriation in pharma industry ? plz explain me


iam usig ph buffers merk. manually how to prepare ?


Which products will produce when acetic anhydride reacts with Ter-butanol, Sec-butanol, Iso butanol, Dimethylamine etc.


why should we perform dissolution PVT calibration only by UV spectrometer, not by HPLC ?


Why only Copper standard is used to calibrate Atomic Absorption spectrophotometer?


In performance Check of GC Why Hexadecane Peak is Considered 


Which type of column should i use to check the purity of high molecular weight protein using HPLC reverse phase column chromatography? Hi everyone. I wanna to check the purity of high molecular weight protein (collagen) with MW of ~130 kDa using a HPLC. I know C18


How you develop a method in HPLC?


sop of a uv visible spectrophotometer double beam elico model


For titration in anhydrous media with perchloric acide, if lack of titrator, Which indicator is been used for replacement. How calculate pH of test solution to choose suitable indicator?


If we do accuracy at same concentration at which linearity planned,what is the need to do linearity separately?


can we use the same detector in HPLC as well GC and what could be the differences we can find in the final chromato graph in any aspects?


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


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


we are performed SOR for a particular product the limit is -6 to -10.We face particular bathes it is not meeting the specification.we performed diffrent instrument diffrent analyst we are getting diffrent diffrent results.solvent is dimethyl sulfoxide what could be the reasion