Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what is lod and loq

3 6717

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 ?



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

2 10217

why r u using hplc grade solvents

4 7843

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

Matrix, Spar Labs,

1 13153

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

1 3509

what is GLP? Which industries it requried?

GVK, Aurobindo, AXIS Clinicals,

1 9455

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

2 4119

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

Reddy Labs,

2 2043

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

Cipla, Chola,

1 2027

How to do regeneration of Metacarb Pb plus column?


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 7689

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

Glenmark, MMC Health Care,

3 7954

why plane of polarized light rotated by opticaly active compunds?


1 3832

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

Reddy Labs,

3 8675

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Un-Answered Questions { Analytical Chemistry }

what is %labelled amount in content uniformity of dosage unit and its calculation?


what is the identification test of volatile substance? what is volatile compound?


We use hicrome 10 cxs column in hplc analysis....pls tell me.. what is the meaning of 10 cxs?


Tell me about analytical method validation in QC


How will u perform degradation study in detectors other thann PDA in HPLC Methodology


What is the calibration of uv process and preparation


USP methodology, EP methodology, IP methodology, among three if possible to use one methodology for qualify working standard to use USP, EP, IP ? Please explain...


what is the limit for KF Factor ,we take factor using water we will found factor between 6 to 7 ,while on KF Reagent bottle mentioned 5 mg/ml water content.if we not use dried methanol it is effect on factor.


Ratio of Water and Acetonitrile(diluent) is not recommended to use in cleaning method validation,why?


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


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


What is the pilot-plant in pharma sector.


what is definition of validation? which components are followed give detail?


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


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?