Since Suprunovichl first called attention to the usefulness of di-P-naphthylthiocarbazone as an analytical reagent for the detection and estimation of certain metals, this new reagent has been successfully employed in the determination of mercury $ and zinc3 in biological materials. The compound is not commercially available and therefore has now been synthesized in this labora-tory. Two methods were tried-that described by Suprunovich, la ...