Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what is rs test why we are perfoming rs test

2 5535

In GC calibration,what is the procedure to calibrate the TCD (thermal counductivity detector)suggest ?



What is difference between silica used in TLC and HPLC column

Cipla, Meghmani Organics,

4 12844

Why Urasil and Caffeine use for HPLC wavelength accuracy calibration. which is most suitable, Why? other than these which can be used?


7 11981

When we r doing processing method for sst in Empower software by HPLC, What value has to give in void volume and as per which pharmacopia!

Micro Labs, Mylan,

4 8631

what is use of acetonitrile compare to methanol in RP-HPLC Method devlopment

Orchid, Neuland,

7 15917

is a bonded water molecule in an organic material can be easlisy and accuractly determined by KF rather than LOD

2 4530

How to know HPLC column performance?

Meghmani Organics,

4 7747

What is heavy water

Meghmani Organics,

2 5313

What will be the effect on HPLC analysis result if three mobile phases given separately through three valves and same proportion mixed together and given by one valve?


1 2713

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


why you are using benzoic acid for water content determination in TEA

2 4793

difference between instrumenent and equipment

6 7985

mixed 1.0 ml of methanol and 1.0 ml of toluene and injected in gas chromatography.will you prove that both solvents are in the ratio 1:1(not by area normalization)

1 1292

Post New Analytical Chemistry Questions

Un-Answered Questions { Analytical Chemistry }

During Validation study, Recovery is passing at all levels but Linearity is failing. Justify?


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


What are modes of quantification in related substances


for heavy metal test lead used in which form pure form or any other form for preparation of lead standard sol


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?


In Karl Fischer titration,What is the situation if the material tested is only soluble in water,and not soluble in the common solvents used such as methanol ?? [e.g. Iron III Hydroxide polymaltose]


How to determine the EDTA content by potentiometry titration in Ceftriaxine sodium


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


which one is better separation in high pressure liquide chromatogram orlowpressure chromato gram in hplc


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


why 6 tablets use for dissolution


what type of question will ask in the interview of lab chemist.


How do we quantify crystaline and amarpous forms by using (NMR, XRD)spectroscopic techniques? Which any others instruments are useful for this quantification? explain


What is the acceptance criteria for moisture balance when calibrated with sodium sulfate


why we use sodium salicylate in uv light calibration at TLC chamber