63088 Evaluation of Heavy Metals In Mangrove Soil of the Graciosa River In Bahia, Brazil.

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Sunday, October 31, 2010
Long Beach Convention Center, Outside Room 204, Second Floor, Virtual Posters
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Quintino R. ARAUJO1, Raquel Krause2, Sandoval Santana1, Taiana Araujo3, José R. Mendonça1 and Aldo V. Trindade4, (1)Soil Section and Dept. of Agrarian and Environmental Sciences, Cocoa Research Center - Cepec / Ceplac and State University of Santa Cruz, Itabuna, BA, Brazil
(2)Agronomy, State University of Santa Cruz, Ilhéus, BA, Brazil
(3)Oceanography, State University of Santa Cruz and Federal University of Paraná, Ilhéus, BA and Pontal do PR, Brazil
(4)Brazilian Agricultural Research Corporation, Cruz da Almas, BA, Brazil

Mangrove soils are developed from marine and fluvial sediments and are predominantly characterized by high salt and organic matter concentrations. They are distributed along coastal areas with smooth topography and under constant influence of both, marine and fresh waters. Mangrove soils have specific physical, chemical and biological properties, as well as some heavy metals that in high concentrations become toxic to the environment. This work aimed to characterize a mangrove soil in South Bahia, Brazil, with focus on heavy metals. Samples of 5 layers from a profile (125 cm depth) were evaluated. In a first phase it was done the characterization of soil samples collected in a deforested (anthropic) riverine area, in 2002. For the superficial layer C1 (0-20 cm) samples of an adjacent and non impacted area (under natural conditions) had been also collected. Secondarily, data from both superficial layer samples (natural and anthropic) were compared, considering samples of 2002 (deforested situation) and 2007 (regenerated situation). Heavy metals concentration on the samples of 2002 were significantly different among the layers and exhibited, in general, low levels in relation to those found in no polluted soils, except for Cd and Pb that presented intermediate level. In the period between 2002 and 2007, for the superficial layers, natural and anthropic, a decrease in metals concentrations was observed, except to Ni.

Key Words: Gleysol; Soil properties; Trace elements.

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