Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

wen v have polr solvent then which type of column use in hplc

2 5181

What is Threshold in hplc?

Hetero,

2 13840

Why we use Caffeine in hplc calibration

Laurus, Emcure,

2 10099




what is the meaning of stress study?

Reddy Labs,

2 2267

what is the difference between potentiometric assay and hplc assay

Parabolic,

2 10620

why we are using buffer solutionas as a mobile phase in hplc.

2 8085

importance of internal standard and in what conditions it is used?

1 2420

how to selecet an exact coloumn for an new molecule development by hplc how to select exact salt as buffer for new molecule development by hplc what is the the process to select the mode of saparation of compoundes by hplc what is the use of ph of buffer what is use of buffer,ph,organic phase,ans methods how the molecules get saparated in coloumn,

1159




how to select short coloum and long coloumn for new molecule

Rampex Labs,

1048

what is poarimeter, why it is used in pharma,and explain briefly about polarimeter?

GVK,

3 7622

Why KBR is used in IR for preparation of pellete, why it shows zero dipole moment

GVK,

7 7470

what is optical active and non active give examples?

GVK,

1 2933

what is custom fields in waters system?

Aurobindo, Akorn India,

1 5882

my name is santhosh i cmpleted b.pharmacy in 2009 then i went to uk in 2010 to pg diploma business management. after i came back to india.. recently again apply to uk for pharmaceutical analysis. they refused my visa you failed to explain y u r change subject. so plz ineed answer for y change the cource

1 1521

why kbr is used for pellet preparation in ir spectroscopy, give the reasons? why kbr shows zero dipole moment?

6 10877


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Un-Answered Questions { Analytical Chemistry }

How to decide assay range for non pharmacopeial API analysis by HPLC? Could you give me any reference for same e.g Guidelines or Paper publications?

1905


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?

2100


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?

332


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

333


What is the principle of HPLC, GC, LCMS, GCMS,LC QQQ, GC QQQ, LC Q TOF and GC Q TOF. What are the applications and Specificity?

6015






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

2148


What is intact assay method development.....?

1139


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

1085


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

968


Colorimtry

252


what is the purge flow & how to calculate

1205


some product having water content method with pyridine and ethylene glycol mixture instead of methanol? how they are selecting and methanol is not suitable solvent how ?

1180


what is the disso medium for tropsiun chloride

940


Why only hydroxy naphthol blue indicator is used for standardisation of 0.05M EDTA solution instead of solochrome Black T or Euriochrome Black T indicator which is used for all sample analysis with 0.05M EDTA solution?

1051


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

380