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1 February 2003 Mercury in the Moji-Guaçu River Basin, S.P—Brazil: The Link between Marginal Lagoons and River Contribution, Assessed by 210Pb Dating Profiles
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Abstract

Total mercury content was evaluated in water and suspended sediment samples of the Moji-Guaçu river and in water and bottom sediment of its 3 marginal lagoons (Catingueiro, Barrinha, and Rio das Pedras), located down-stream of the sampling point in the main channel. In all situations, low Hg concentrations were found in suspended and bottom sediments. Aluminum was used as a geo-chemical tracer to normalize the Hg concentrations in the sediment cores from the Rio das Pedras lagoon (r = 0.92). It was estimated that the Moji-Guaçu river transports up to 19 kg Hg yr−1, 65% in the dissolved form and 35% adsorbed onto particulate matter. Following an acute toxic stage observed in the years 1970–1980, the basin has been restored to its original conditions mainly by natural recovery and a general reduction in Hg input to the eco-system.

Glauco Arnold Tavares, José Roberto Ferreira, Carlos Emanuel de Carvalho Magalhães, Nivaldo Carlos da Silva, and Maria Helena Tirollo Taddei "Mercury in the Moji-Guaçu River Basin, S.P—Brazil: The Link between Marginal Lagoons and River Contribution, Assessed by 210Pb Dating Profiles," AMBIO: A Journal of the Human Environment 32(1), (1 February 2003). https://doi.org/10.1579/0044-7447-32.1.47
Received: 1 October 2001; Accepted: 1 February 2002; Published: 1 February 2003
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