Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What is the difference between potentiometry assay and HPLc assay?

Apotex, Torrent Power, Aurobindo, Divis Laboratories,

2 11891

how std. of znso4

1 2735

Which std. used for standrdisation of ZnSO4?

1 1026




In GC and HPLC ,how we can decide which of following method will be suitable or use for quantitation of chromatogram at the time of method development. 1.Area Normalisation 2.External standard method 3.Internal standard method

Atul,

1 4592

In Stability testing if significant change occurs then what will be the action plan?

Cipla,

2 7666

what is mean by profiling of dissolution

1 5402

How decided 10 ppm standard solution in Swab, rinse method.?

1 5822

WHAT IS THE LIQUID PHASE IN DB-624 COLUMN IN GCHS

3 5987




In capadity factor formula is K'= (RT of main compound/RT of first eluted peak)-1 in this formula what is 1

Piramal Healthcare,

1 4681

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

845

Why we inject a standard 6 times for Related substances by HPLC and 5 times for Assay?

GVK,

3 12494

In HPLC (Waters) software Empower1,2 &3 what is the updation for each version

APL,

1390

hii, i'm had a sample of 1L that gone through extraction & evaporation. i used 0.5ml of methanol for reconstitution before injecting the sample to HPLC. i made a calibration curve using a standard solution but now i'm confused about how to display the concentration i got from the sample. for ex. i got 0.2ug/ml how i'm gonna explane this is for the 1L ? please help .. i'll really appreciate it thanks

1 2222

Dear Sir, This is Thirunavukkarasu am working in Ordain Health Care AR&D, Am Having one problem While doing method development my question Metadoxine and Pyridoxine same chemical nature and structural activity i tried lot of methods but Analyte eluted same Retantion time i cant separate both peaks. solubility, pH both are same only only difference melting point metadoxine 210 C Pyridoxine 102 C please do the help needful for me

Ordain Solutions,

5 5306

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 ?

Micro Labs, VMSRF,

1136


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Un-Answered Questions { Analytical Chemistry }

1)What's the meaning of Absorption,give a example. 2)What's the meaning of Adsorption,give a example. 2)what is the difference between Absorption and Adsorption.

1105


what are the standard methods for HPLC?

1483


why we use a particular hplc column for a particular compound give reasons?please

1490


While performing TOC sst analysis Zero shift disabled & sample analysis zero shift enabled why?

962


How to choose the which salt is suitable for mobilephase

1653






how you determine moist.of NaOH sol or NaOH flacks

998


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

789


what type of questions asked on analytical balance and also give answers................all pharma companies?

5966


What is the principle of Thermal conductivity detector and FID?

1400


why does used dry caffien in HPLC calibration?

564


Home heating oil or furnace oil what is made from? Can (base oil plus diesel/kerosen) = home heating oil?

845


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

1406


What is the difference between purge septum flow and column flow in gas chromatography?

760


Did anybody have method for acetyl cysteine effervescnce tablet

877


why equlirium conatant of water have 14 value

897