Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

In burette calibration of Karl fischer Instrument, the multiplication factor 1.00693 is using for how much ml of water dispenced. why

1 1649

how can we decide the limit of cleaning validation? What is the criteria for it?

Glenmark,

2 9145

What is difference between Related Substance & Impurity Profile?

Jubilant Organosys,

2 39638




Why we are injecting low load standard conc. while analysing Related Substances by HPLC?

3 6807

why wetlab is called as wetlab

6 10980

In UV-VIS spectrophotometer:My diluent is methanol even though i corrected base line for methanol,In my sample scan i found methanol peak.what is the reason?

2 6726

What is the diffrence between the performing of LOD ordinary drying at voven and vaccum method.

Apex,

4 6180

How can we calibrate the burette dispencing capacity in metrorm kf titration calibration

1 4072




how a particular wavelength can be different for a particular compund while analysing by uv and by HPLC.

1011

in hplc calibration we are using 0.05% acetone why we are using that one and what happen when its conc increases or decreases

Aurobindo, Cadila, Martin,

4 17814

loss on drying we applied vaccum for some compounds and some compounds are at 105c why

3 7745

why we are calibrating autopolarimeter with quartz control plates

1 3611

what is the different in Total ash, sulphated ash, acid insoluble ash, alcoholic or non alcoholic ash?

Siemens, GHI,

6581

why we use TLC?

8 13811

why disodium tartarate is used for autotitrator calibration

Cipla, Micro Labs,

2 8864


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Un-Answered Questions { Analytical Chemistry }

Why to use propyl paraben in HPLC gradient calibration

151


Can we interpret accuracy from linearity in method validation?

669


how to select short coloum and long coloumn for new molecule

922


What is the exact reason to use THF and IPA in buffers of Reverse phase HPLC as a solvent?

2391


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

1292






What is stray light in uv what are units for stray light

129


what is different when impergnated silica plates are used in separation of azo dyes using column chromatography?

604


Why only Copper standard is used to calibrate Atomic Absorption spectrophotometer?

1138


how to calibrate hplc & gc

3014


when we talk about change in entropy we consider total entropy means of surround +entropy of system but when we talk about change in Gibss free energy we consider entropy of system.explain with reason.

711


Why potassium dichromate was using in Uv calibration?

87


calibrtion procedue of LC-MS

1173


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

115


Why acetonitrile and water are used as extraction solvent when analysis melamine? I thought they are miscible and won't be able to separate...

134


How they found 1mL of K.F reagent is equivalent to 5mg of water and if we change the composition of K.F reagent, is it can neutralize more amount of water?

237