Is there any manual/methodology available for analyzing heavy metals (Cd, Pb and Cr) by using UV-VIS spectroscopy in aqueous solution?

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C.A. (Kees) Kan

Consult the EPA website for this

David Beveridge

If you have reasonable access to analytical chemistry textbooks published in the last 60 years or so, you should be able to find methods. Briefly, I expect these would be: for Cd and Pb, dithizone (probably extraction); for Cr, oxidise to chromate and determine that.

Aghilas Brahmi

You can use isobutyl ketone (MIBK) for copper and cadmium .