Answer Posted / m.g. madhu babu

1. Assay will vary w.r.t. the sample quantity.
Irrespective of sample quantity final result should be the
same. (No change in the result).
2. For assay, reference std. must. No ref. std. will be
used for purity.
3. Assay can be calculated by chemical, HPLC, UV, IC, etc.,
where as purity by using chromatography only.
4. Mainly assay will be calcluated for API's, where as
purity for RM's & IM's.

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