Answer Posted / dilip m patil

1)The gravimetric technique is used to perform the residue
ignition test or sulphated ash test. The residue obtained
after sulfuric acid treatemnt is chemically and thermally
stable and it fulfiles principles of gravimetric analysis
techique.
2)The residue obtained without use of sulphuric acid are
sensitive to carbon dioxide and moisture present in lab.
atomosphere. Hence the residues composition changes and
ultimately mass of residues changes during final weighing
of residue and the accuracy and precision of test will be
questionable.

Related substance method equivalency on control sample or spiked sample?

761

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if instrument calibration fails then what require to do?

977

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[3/30, 13:29] Manoj P Venkatpurwar: How hplc column selection according to structure? How mobile phase buffer selection on molecule structure?

781

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A ha tc is actual defination of retention time?

1617

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in which situation ion pair require to use?

813

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

2296

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before starting analytical method valodation what you checking? and how giving preference to start validation?

798

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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?

3353

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

2693

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What is diffrence between extractable volume and deliverable volume? Answer pls

4569

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WHY pKa value is more important than pH value of the mobile phase in HPLC?

1763

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what is the principle of UV Vis spectroscopy, AAS, ICP OES,ICPAES, ICP-MS and FTIR

9246

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if identification threshold crosses the limits then what next step?

858

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Which parameter require to do for analytical method equivalency?

773

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Which is the highly polar and highly non polar column in HPLC?

2304

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