Distribution of heavy metals in the geochemical phases of sediments from the Tiete River, Brazil

作者：Mortatti Jefferson^*; de Oliveira Helder; de Moraes Graziela Meneghel; Vendramini Diego; Fernandes Alexandre Martins

来源：Chemical Speciation and Bioavailability, 2013, 25(3): 194-200.

DOI：10.3184/095422913X13785624164620

• heavy metal
• Tiete River
• riverbed sediment
• sequential extraction
• geochemical phases

The fractionation of heavy metals in riverbed sediments along the Tiete River basin, a highly polluted river in southeast region of Brazil, was investigated using a four-step sequential extraction procedure, in order to determine the concentration and distribution of Cu, Co, Cr, Cd, Zn, Ni and Pb, in the river bottom sediments, related to the potential mobility of geochemical phases. Around the metropolitan area of the City of Sao Paulo, which has 25 million people, the pollution is associated with municipal wastes and industrial effluents. Potentials of high mobility were observed for Cu and Zn along the entire river basin, associated mainly to the organic fraction, while at the Pirapora and Anhembi stations (upper and middle parts of the basin, respectively) the reactive forms of Ni and Pb were more associated to the Fe and Mn oxides. Near the mouth of the Tiete River, no significant contaminations caused by Cr and Ni in riverbed sediments was verified confirming the presence of these metals in the residual or lithogenous phase.

• 出版日期2013-9