Answer Posted / mahdi

because because sharp absorbance bands and good solution stability of caffeine, this substance used for calibration of UV detector.

Why Ethanol is Used for Standardization of GC Head space?

4225

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what is %labelled amount in content uniformity of dosage unit and its calculation?

5215

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how require to set assay concentration for standard and sample?

915

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could negative ions be produced by bombardment process in mass spectrometry?

1773

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can i use hplc detector to uplc and why?

2278

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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?

3534

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What is the main difference between ODS1 and ODS2 Hplc column.

5207

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

1149

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How we choose the mobile phase for method development.?

1205

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if you have given one product then how you determine the impurity in that?

732

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what is the origin to prepare standard operating procedure

2318

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for inorganic molecules require to do RS, Assay and disso?

729

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we can use expired sample for validation and analyst qualification?

799

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

2537

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We use Potassium Dichromate solution for the calibration of UV-Visible Spectrophotometer in UV region. My question is to calibrate visible region which solution could be used in photometric accuracy

1902

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