Answer Posted / ravi kumar tummala

yes, we r injecting std injection at low concentrtion,one reason is impurity specification level and another one is to calculate the imp's against std area.

How to decide assay range for non pharmacopeial API analysis by HPLC? Could you give me any reference for same e.g Guidelines or Paper publications?

2873

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how you start RS method development when for new product?

295

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is it nessesary to do solution stability for 7 days?

322

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for which product require to do content uniformity? what is limit of cu?

323

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How we can identify process related and degradation impurity in single method with short period?

340

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please explain about aluminium hydroxide assay

713

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when we talk about change in entropy we consider total entropy means of surround +entropy of system but when we talk about change in Gibss free energy we consider entropy of system.explain with reason.

1526

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UV and PDA detector, which have less signal to noise ratio?

652

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We use hicrome 10 cxs column in hplc analysis....pls tell me.. what is the meaning of 10 cxs?

1163

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WHY given much noise PDA dector then VWD Dector

1508

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What is rs test why we are performing rs test?

1310

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Why perchloric acid used for potentiometric titration

2172

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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?

2984

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In HPLC (Waters) software Empower1,2 &3 what is the updation for each version

2475

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

1842

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