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Chemical transportation of heavymetals in the constructed wetland impacted byacid drainage was investigated seasonallyusing a combination of the selective sequential extraction of the sediments with elemental analysis of the emergent vegetation in the wetland. Manganese was dissolved from sediments in the constructed wetland bythe contact with acid drainage, and then precipitated again as ionexchangeable forms. It was expected that a part of Mn and Fe bound to oxides were flown out of the wetland as suspended particulate matters. It was observed that there is passive absorption of Mn in leaves of Phragmites austlaris in the upstream of the wetland. The transportation of Cu clearlyshowed the seasonal variation: there was the decomposition of organic substances with high molecular weights bysoil microorganisms in summer. Therefore, Cu was complexed to the humic substances, and dramaticallyadosorbed onto the roots of Phragmites austlaris in down stream of the wetland. It was also observed that there is active absorption of Fe in roots and leaves of Phragmites austlaris. Most of the zinc was stronglybounded to the sediments, therefore, scarcelyuptaken to the vegetation. It was also found that there were heavymetal distributions between plant organs.

Chemical Transportation of Heavy Metals in the Constructed Wetland Impacted by Acid Drainage