This book deals with the introduction to heavy metals, pollution, sources and their toxic effects to living systems. The developed analytical protocol involved the production of catalytic hydrogen waves from metal-dithiocarbamate complexes at DME in presence of supporting electrolytic medium. The same principle was adopted for the quantification of Cr(VI), Mn(II) and Co(II) in various environmental samples. This book is highly useful to environmentalists and chemists for the routine analysis of heavy metal ions.