Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What is the use of tlc and hplc? And when and where use?

146

What is similarity factor and its use in api strength?

129

How do we fix the sample concentaryion in hplc method development. What is the basis?

117

Why six unit used for precision?

126

In the gas chromatography what is used carrier gas and make up gas?

126

What is the difference between chromatographic purity and related substances?

143

What is rs test why we are performing rs test?

163

What is difference between the working standard and reference standard?

1 149

What is delay volume?

133

Why are use silicon oil mr?

105

How we choose the mobile phase for method development.?

107

How to calibration of the uv spectroscopy and its test?

101

Explain what is a base line?

118

How do we fix the sample concentaryion in hplc method development?

107

How to establish relative response factor for hplc. Why it is required?

96


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Un-Answered Questions { Analytical Chemistry }

Why to use propyl paraben in HPLC gradient calibration

2091


why lactose has less charges when packed in steel containers when compared with packing of lactose in polyamide material?

1197


How to choose the which salt is suitable for mobilephase

1993


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

513


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

2183






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

1330


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

1908


What is the Formula for coreletion coefficient in plhplc calibration

466


are there in uv lamb that is chractrestic for wavelenghth 205 nm ?????

941


What is delay volume?

133


For titration in anhydrous media with perchloric acide, if lack of titrator, Which indicator is been used for replacement. How calculate pH of test solution to choose suitable indicator?

1160


in sampling of raw material which side is pasted sampled labels

502


cefoperozone and sulbactam inj. hplc test method

1497


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

1506


What are modes of quantification in related substances

1161