Abstract
Abstract Peroxydisulfate salts are effective oxidants for refractory organic material, including humic substances, but their usefulness in trace metal determinations is limited by the presence of impurities in commercial preparations. Peroxydisulfates were synthesized chemically and electrolytically, and assayed accurately in admixture with side products and starting materials. Even without elaborate environmental controls, the non-electrochemical route was adapted readily to the preparation of potassium Peroxydisulfate containing < 6ngg−1 of Zn, and < 3ngg−1 of Cu and Pb. A key step in the synthesis was the purification of H2O2 by fractional recrystallization.
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