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Type: Artigo de periódico
Title: Sedimentation Rates In Estuary In The Southeastern Brazil Based On Geochemical Signature And Industrial History [taxas De Sedimentação Em Estuário Do Sudeste Do Brasil, Baseadas Em Assinatura Geoquímica E Histórico Industrial]
Author: Luiz-Silva W.
Matos R.H.R.
Machado W.
Nizoli E.C.
Abstract: Iron analyses and steel production records were combined to establish a historical profile of pollutant levels in sediments from the Santos-Cubatão estuarine system (São Paulo-Brazil) over past 45 years (1959 to 2004). Iron signature through a sediment core (260-cm long) showed a strong correlation with steel plant activities in the Morrão River. The deeper sediments (>90 cm), which were deposited before 1976, contain lower iron concentrations (5.26 ± 0.69%) and average sedimentation rate of 7.6 cm y -1. This could be related to a period of low industrial production and increasing construction in the Cubatão industrial complex. Sediments at 90-40 cm depth show higher concentrations of iron (up to 32.52%) and average sedimentation rate of 6.6 cm y -1. This evidenced the increasing steel production and the discharge of industrial waste between 1977 and 1983. In the sediments related to periods after 1984, we verified a sudden decrease in both Fe levels (8.43-22.35%) and sedimentary rate (average of 1.7 cm y -1). It was thought to be a result of anti-pollution government program initiated on that year and reforestation of the "Serra do Mar" mountain range, which reduced erosion in the drainage basin. This study showed that metal signature recorded in the sediment can be explained by known activities in the watershed and can be an alternative technique to evaluate the sedimentation history.
Rights: fechado
Identifier DOI: 
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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