Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what are peak purity,peak purity index,peak thresold

2 10807

1)why use benzophenon,uracil in hplc calibration. 2)why use sucrose in polarimeter calibration. 3)what is S/N ratio, noise and drift in hplc 4)how we can find lod and loq in method validation

1 9855

What is (Q) point dissolution?

Cipla, Macleods,

6 17069

Why we are using K2Cr2O7 for control of absorbance in UV?

2 9226

1 why polyesterene film used for ftir calibration ? 2 why k2cr2o7 is used for control of abs in uv ? 3 why holmium oxide used for control of wavelength in uv

3 8606

what is the principal of malvern particle sizer & its used in pharma industry

3 5161

what is the difference between system precision and method precision?

Teva Pharmaceuticals,

3 19045

In lcms analysis some times we get sodium and potassium adducts. if the compound is havine sodium ions how can we confirm wether sodium is from sample or it is a adduct?

Teva Pharmaceuticals,

2 4478

what is difference between moisture contents and water contents ?

Cipla, Hetero, USM,

12 41119

In GC, What does 'Column condensation test' mean by?

Reddy Labs,

2 7402

same sample on two preapration gives differnt result during hplc analysis

3 4441

what is titrent,& titrate

Graviti Pharmaceuticals,

2 8356

Why we are using a Kf Factor range 4 to 6

7 28259

What is difference between Chromatographic purity and Related substances analysis?

3 15862

Why we are using the methanol in Kf titration?

Reddy Labs,

6 13842

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Un-Answered Questions { Analytical Chemistry }

why we use Dichlorobenzene.nitrobezine.t-butyldi sulhate.for calibration of gc Head space


Tell me about analytical method validation in QC



what is impurity profile. how to interpret this impurity profile to a drug product or drug substance.


what are the standard methods for HPLC?


how you determine moist.of NaOH sol or NaOH flacks


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


What are usp limits for total impurities,unknown impurity


How to determine the EDTA content by potentiometry titration in Ceftriaxine sodium


What is the difference between Discriminating media and DPDM(Dissolution Profile with Different Media)


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


what is DIPE limit in residual solvent?


In dissolution of tablets/capsules elaborate the Dissolution limit 20.0% to 60% Q in 30 minutes.


How can we calculate "confidence interval" in analytical method validation? Pl. explain with example.


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?