Busca avançada
Ano de início
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Combined analysis of trace elements and isotopic composition of particulate organic matter in suspended sediment to assess their origin and flux in a tropical disturbed watershed

Texto completo
Fernandes, Alexandre Martins ; Hissler, Christophe ; da Conceicao, Fabiano Tomazini ; Spatti Junior, Eder Paulo ; Mortatti, Jefferson
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: Environmental Pollution; v. 218, p. 844-854, NOV 2016.
Citações Web of Science: 0

Approximately 40% of the volume of domestic sewage generated in the Sao Paulo State is untreated and released into water bodies, causing serious pollution problems that affect the water quality and especially the suspended sediments transported by rivers. Thus, this paper investigates the seasonal influence on the origin and fluxes of Cu, Co, Cr, Zn, Cd, Ni, Sc and particulate organic matter (POM) in sediments transported by a disturbed watershed in the Sao Paulo State, i.e. the Sorocaba River basin. POM was characterized using particulate organic carbon, particulate organic nitrogen, C:N ratio and delta C-13 and delta N-15 stable isotopic composition. Eight sample collections of fine suspended sediments (FSS) were carried out at the mouth of the Sorocaba River from July 2009 to May 2010. During the study period, the discharge rate followed the seasonal variation trend of the past 25 years. Zn was the most abundant trace element in the FSS, followed by Cr, Cu, Ni, Co, Sc and Cd. There was a higher concentration of trace elements during the dry season, except for Sc and Co, which did not vary seasonally. The POM showed the same trend, with higher concentrations during the dry season. The calculated enrichment factors and geo-accumulation index indicated that most of the trace elements are of geogenic origin, except for Zn, which showed significant anthropogenic contributions (55%). The elemental and isotopic analysis of C and N and C:N ratio indicated that the anthropogenic origin of POM found in the FSS is related mainly to domestic sewage (97%), while the significant correlation found between the concentrations of Zn and POM indicates that the main anthropogenic source of Zn is related to this domestic sewage. The FSS load transported during the study period was of 373,194 t y(-1), of which 87% occurred during the rainy season. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 08/09369-9 - Características hidrogeoquímicas da bacia de drenagem do rio sorocaba, sp: processos erosivos mecânicos e químicos.
Beneficiário:Alexandre Martins Fernandes
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 08/57104-4 - Balanço da erosão na Bacia do Rio Sorocaba (SP): aspectos dinâmicos da hidrogeoquímica fluvial, processos e modelos de alteração de rochas
Beneficiário:Jefferson Mortatti
Linha de fomento: Auxílio à Pesquisa - Regular