The leaching behavior of heavy metals from coal into aqueous phases containing various substances, such as acids, chelating agents, and surfactants. When a powdery coal was shaken with an acidic solution containing 0.1M HNO_3, 85% of Mn was leached out, while Cu, Ni, Pb, and Zn were considerably leached. The use of 5mM EDTA solution resulted in a considerable leaching of Cu, Mn, Pb, and Zn.
