Answer Posted / jayesh patel

In low pressure gradient elution mixing of solvent done
before the pumps and in high pressure gradient elution
mixing of solvents done after passing from pumps.

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

9988

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

2536

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What is rs test why we are performing rs test?

1851

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What is shaking level in GC?

786

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1)What's the meaning of Absorption,give a example. 2)What's the meaning of Adsorption,give a example. 2)what is the difference between Absorption and Adsorption.

2876

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In the HPLC Calibration done wavelength accuracy done between 200nm-280nm .but not done remaining 300-400nm not done ?

914

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As per ICH related substances stability trend limit from initial to shelf life

3242

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why we use glass fiber filters use in some situation?

787

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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

1588

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Tell me something about Vitamin A test method by HPLC

2668

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What is column in chromatography?

2232

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Why we use potassium dichromate in uv calibration Exact reason behind it??

1250

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What is the Formula for coreletion coefficient in plhplc calibration

1816

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How to start the dissolution development for unknown tab?

1675

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identification is for unknown? qualification for known? reporting for LOQ?

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