36. Analysis of Hazardous Heavy Metals in Coal and Fly Ash, and Their Removal by Aqueous Chelating Agents

Abstract

For several standard coals, the contents of trace heavy metals were determined by use of microwave-digestion and ICP-AES. When powdery coals were shaken with an aqueous solution containing EDTA, some heavy metals, such as Mn, Pb, and Zn, were efficiently leached. When a coal fly ash was shaken with an aqueous solution of gluconic acid, As was favorably removed.