Is complete dissolution by microwave digestion is necessary for determination of heavy metals from paint chips by ICP-OES?

22 December 2015 0 2K Report

I digested a paint sample using nitric acid,hydrgen peroxide and hyfrofluoric acid in which complete dissolution was not obtained. (But centrifuged the sample solution and aspirated the supernatant solution.)

Also studied pre digestion recovery in sample solution and post digestion recovery by fortifying the blank acid solution.

But the recovery obtained in pre digestion was 86% and in sample solution 75%.

My question is it because paint chip digestate was not clear after micro digestion?

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