Answer Posted / ankur dwivedi

As we generally check the inorganics by this test by
converting it into their sulphates with the treatment of
H2SO4 and sulphates are very stable at high temperature
(about up to 800-1000). while nitrates and chlorides are
not stable at high temperature. Hence it is recommended to
go for sulphated ash instead of nitrates and chlorides.

Ankur Dwivedi
ZCL Chemicals, Ankleshwar

please explian me about area normalisation method,diluted standard method,impurity vs impurity and which one has to be selected in method development

1637

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how pda detector works over uv?

742

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Why only 1.2 million lux hours require in photostability study?

1039

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How doing qbd practically?

980

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Tell me something about Vitamin A test method by HPLC

2680

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is it nessesary to do solution stability for 7 days?

777

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what is the extinction coefficient for Indomethacin or at 319nm wave length.

4073

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2. Two grams of Benzoic acid are dissolved in 200 ml of water and extracted with 200 ml of diethyl ether. The distribution coefficient of benzoic acid is 100, and its dissociation constant is 6.5 10-5. Calculate the distribution ratio (D) of benzoic acid at pH 2, 5, and 6. 3. Calculate D at pH 2 to 10 (1 unit apart) in the above problem, and plot D versus pH.

2224

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give clarity of linearity and range in method validation

2420

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Difference between hlaf and rlaf

2115

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how you determine moist.of NaOH sol or NaOH flacks

2222

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which are the sizes of capsules?

972

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How to set analyticl specification for combination products?

748

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Why use only methanol,used determinationof moisture content not use other solvents

1414

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we are performed SOR for a particular product the limit is -6 to -10.We face particular bathes it is not meeting the specification.we performed diffrent instrument diffrent analyst we are getting diffrent diffrent results.solvent is dimethyl sulfoxide what could be the reasion

1872

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