Answer Posted / naresh

Regular usage of old column some stationary phase is loss inside the column compared to new column so compound retention inside the column varies between these two columns

What should be the level/ Percentage of Arsenic in Arsenic free zinc.

2276

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how can I make the copper get white bye any salt or acit?

2268

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

2364

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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

1654

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in stress study if your api not soluble in hcl naoh h2o2 then what require to do?

904

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If suppose 10 methods of dissolution given in pharmacopoeial for single content product then which method out of 10? or all 10 require to follow?

1042

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What is the requirement for brazil in the analytical method vslidation comparr to ich?

854

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what is the structure of DOWEX-50

5562

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what is mean by extactable and leachable study?

1227

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mode of absorption in alimentary canal?

2436

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Basic principle of ESI?

2209

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Why sometime potassium ortho phosphate mix with acetone use for sample preparation for hplc

1503

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

4371

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Describe your field experience sample type collected,sample techniques,field measurements taken and equipment used?

2746

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in gas chromatography what is the difference between gas flow rate and average linear velocity ?

2654

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