STP1442

    Study of the Geochemical Distribution of Heavy Metals in Sediments in Areas Impacted by Coal Mining

    Published: Jan 2003


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    Abstract

    This study evaluated the geochemical distribution and potential mobility of heavy metals in sediments impacted by coal extraction in the Candiota Region of Brazil. Sampling was performed in Candiota stream and tributaries, at eleven sites, in February and June 2000. The silt/clay fraction of sediments was analyzed by total and sequential extraction schemes established by the EPA and European Commission, respectively. The results indicated higher mobility for manganese, intermediary for nickel, zinc, copper, and lower for iron, chromium, and aluminum. The mouth of Poacá Stream, most affected by mining activities, presented an increase of iron in the oxidizable fraction, as well as zinc, nickel, and copper, suggesting association with sulfides and presence of pyrite in the sediments. The same behavior was observed in the Candiota Stream, after the entrance of the Poacá. Due to a lower pH (4.3) caused by mining acid drainage, at the mouth of Poacá Stream, manganese content decreased in sediments and increased ten times in the water column.

    Keywords:

    sequential extraction, geochemical distribution, sediments, heavy metals, coal


    Author Information:

    Teixeira, EC
    Research Scientist and Chemist, FEPAM, Porto Alegre, RS

    Rodrigues, MLK
    Research Scientist and Chemist, FEPAM, Porto Alegre, RS

    Alves, MFC
    Research Scientist and Chemist, FEPAM, Porto Alegre, RS

    Barbosa, JR
    Research Scientist and Chemist, FEPAM, Porto Alegre, RS


    Paper ID: STP11555S

    Committee/Subcommittee: D18.25

    DOI: 10.1520/STP11555S


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