Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what is lod and loq

3 10156

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 ?

Wockhardt,

3181

What is the b/W dead volume and dwell volume ?

2 13417

why r u using hplc grade solvents

4 11362

Why do we use sodium salicylate for Calibration TLC Cabinet U.V Lamps

Matrix, Spar Labs,

3 22560

How do you show that equal quanitities of two isomers provide the same response using a PDA

1 5334

what is GLP? Which industries it requried?

Aurobindo, AXIS Clinicals, GVK,

1 11614

How can we separate Urea & semicarbazide in single HPLC method ?

2 6224

What is the calibration procedure for Malvern MS2000 particle size analyzer and acceptance criteria?

Reddy Labs,

2 5007

why we can use only 4 and 7 and 9 buffers in pH calibration

Chola, Cipla,

1 4466

How to do regeneration of Metacarb Pb plus column?

2077

we calibrate HPLC once in 6 months while iam doing calibration i came to know that calibration was failed. then how can i justify that the samples analyzed on the system during this 6 months was wright? how can i forward in to the next step for those batches?

5 11113

What is the solvent/material used to balance spirit level in analytical balance?

Glenmark, MMC Health Care,

5 11852

why plane of polarized light rotated by opticaly active compunds?

Glenmark,

1 5598

why do we use around only 60 mg of K2cr2o7 in the UV calibration -control of absorbance test?

Reddy Labs,

3 12956


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Un-Answered Questions { Analytical Chemistry }

Why we use potassium dichromate in uv calibration Exact reason behind it??

657


why xterra column require to use at higher ph?

430


What are the primary considerations in extractables and Leachables ?

1779


WHAT IS THE CRITERIA FOR SELECTION OF TIME OF DISSOLUTION AND THE MEDIUM OF DISSOLUTION?

2139


What is third generation HPLC Columns?

1507






In HPLC Calibration, On which basis RSD Limit of noise test is fixed (NMT 33.0 % )

2957


Please give idea about method development for cleaning method and how maco level establish

268


Basic principle of ESI?

1640


how much mass should be there in volumetric flask while in preparation of sample for assay? 

2055


Why to use propyl paraben in HPLC gradient calibration

6075


why we are using benzene, anyline in acetic anhdride assay titration method?

1573


How can we confirm the HPLC column is end-capped or not? Is it possible to identify by physical appearance?

2715


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?

2341


what is mean by 40 in the dissolution basket mesh size?

287


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?

2975