Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

In dissolution test s1 stage we are getting one bowl 40 % out of 6 bowls what is the root cause you find and how proceed next step? ( Q is 80%)

Reddy Labs,

1 1268

why we inject sample TWICE in ASSAY by HPLC analysis but in RS once?

Aurobindo, Neuland, DRL,

4 6402

What id the resolution factor

1 2063




what is a placebo peak

GMP Pharma, Optimus,

2 2663

what is the effect of injection volume calculate flow rate in perkin elmer headspace? (ccm parameter in HS)

1 894

How can we calculates the solubility of the drug in different medias by injecting in to hplc????(solubility studies)

Super Pharmaceuticals,

2 2084

What is the use of Holmium (III) Oxide???

Finar Chemicals,

1 2950

India is. Under which zone as per QF1.?

Aurobindo, Gland Pharma, Acebright,

4 7649




how to calculate the Step and ripple accuracy for pump gradient test for UPLC?

Wockhardt,

1 3761

why salicylic acid not use for dissolution.

Cipla, Indo Baijin Chemicals,

1 2831

Which water can use Hplc analysis

Dr Reddys, BioGenomics, Reddy Labs,

9 6154

if you have given a blank water how you analyse by general analytical techniques?

700

what is the analytical procedure for COD and BoD

Dai-Ichi,

1 2370

Why pH lies between 0 to 14 only

PI Industries, Unimark Remedies,

4 6277

In chromatograpbic purity 90% is there, in assay 70% is there. How will you prove remaining 30%.

Dr Reddys,

3 4665


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Un-Answered Questions { Analytical Chemistry }

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?

292


What is the exact reason to use THF and IPA in buffers of Reverse phase HPLC as a solvent?

2472


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

336


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?

1233


about method developement in hplc

374






how to select short coloum and long coloumn for new molecule

1008


How to define samples weight in moisture content

110


How will u perform degradation study in detectors other thann PDA in HPLC Methodology

1219


How much is the standard area for glc analysis

913


what is lod and loq ?,why use k2cr2o7 , kcl h2so4 in uv calibration ?,why use benzophenone & caffene acetone in hplc calibration ?,what is leading peak in hplc ?why we do the calibration of limit of stry light in hplc & uv ?

2087


Principle of single pan analytical balance

3629


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

845


WHAT IS THE PURPOSE WE USE HCL, CHOPPER, BURNER, MONOCHROMATOR in AAS? PLEASE EXPLAIN BRIEFLY

1045


what is difference in ods I ods II is this is realy from sorbent / packing characteristics or from other means

679


2. Two grams of Benzoic acid are dissolved in 200 ml of water and extracted with 200 ml of diethyl ether. The distribution coefficient of benzoic acid is 100, and its dissociation constant is 6.5 10-5. Calculate the distribution ratio (D) of benzoic acid at pH 2, 5, and 6. 3. Calculate D at pH 2 to 10 (1 unit apart) in the above problem, and plot D versus pH.

862