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Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

tell me about aliphatic acid estimation by hplc which columns can we use

Dr Reddys,

1 1958

does water content by KF will calculate only external moisture absorbed or the ligand ? (for ex copper sulphate pentahydrate)

NA,

899

Why we perform the ir analysis?

Sequent,

3 2180

difference between calibration and validation

Mylan,

2 2978

why lactose has less charges when packed in steel containers when compared with packing of lactose in polyamide material?

1317

Data was integrated with RRT CONCEPT OR Overlay with SSTchrmatogram concept which is better?

1 1616

what is the difference between qualitative analysis and quantitative analysis and explain them?

Dr Reddys,

1 1795

why disodium tartarate used in karl-fischer instrument ?.

Dishman,

1 1248

why does used dry caffien in HPLC calibration?

Dishman,

1067

Why we don't add Hcl, HNO3, H3PO4 in residue on ignition, why we add H2SO4

1 2333

What is gelatinization?

Nestle,

780

What is FFA, PV, and PAV value in oil.

Nestle,

1 1744

Why we check moisture,ash & AIA in product

909

When recording an IR spectrum in the lab, we take no special precautions to account for the presence of oxygen, nitrogen, or argon in the air. What are the consequences of this?

1 1091

about method developement in hplc

778


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Un-Answered Questions { Analytical Chemistry }

Why to use propyl paraben in HPLC gradient calibration

2916


what are the standard methods for HPLC?

1830


calibrtion procedue of LC-MS

1643


function of detecter in hplc ,gc and spectroscopy? function of carrier gas in gc?

1519


process of Diclofenac sodium,IP.

1233






Which is the highly polar and highly non polar column in HPLC?

1187


In BP2013, Loperamid HCl monograph. Assay by titration with 0.1N sodium hydroxide using hydrocloric acid 0.01N and reading the volume added between the 2 points of inflexion. I have a question that if the diluent solvent is ethanol is certainly consumed a amount of volume of titrant, so this volume must be eliminated on the result calculation or not apart from first point which is subtracted above.

2012


pharma industries oriented

1209


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

1198


what is the extinction coefficient for Indomethacin or at 319nm wave length.

2959


how can give the expiry period and restadardisation of volumetric solution

1634


why sre you used Potassium hydrogen phthalate in standarisation of 1N NaOH and 0.1 N Perchloric Acid?

7738


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

835


What is column in chromatography?

1189


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?

2300