| Texto completo | |
| Autor(es): |
da Silva, Gilmar Silverio
[1]
;
Bisinoti, Marcia Cristina
[2]
;
Fadini, Pedro Sergio
[3]
;
Magarelli, Gabriela
[4]
;
Jardim, Wilson F.
[5]
;
Fostier, Anne Helene
[5]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Inst Fed Educ Ciencia & Tecnol Maranhao, Dept Acad Quim, BR-65025000 Sao Luis, MA - Brazil
[2] Univ Estadual Paulista, Inst Biociencias Letras & Ciencias Exatas, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
[3] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil
[4] Nucleo Seguranca Biol, BR-70770900 Brasilia, DF - Brazil
[5] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of the Brazilian Chemical Society; v. 20, n. 6, p. 1127-1134, 2009. |
| Citações Web of Science: | 13 |
| Resumo | |
Despite the low level of industrial activity and human density, Hg concentration in the Negro River basin is relatively high. Soil enriched with naturally high Hg concentrations and atmospheric deposition are the main sources of the metal in this watershed. Differences between invasive and evasive fluxes at the water/air and soil/air interfaces indicate Hg accumulation in the basin at a rate of 39.9 t y(-1). The type of soil, which is the main source of mercury for the water bodies, the hydrological cycle with floods and dry periods, act markedly on the water redox chemistry. A complex interaction between many seasonable variables such as solar intensity, water pH, age of the naturally occurring organic matter and the hydrological cycle alter the redox characteristics of these black water bodies, thus markedly affecting the consumption of Hg(0) and the degradation of methylmercury present in the water. Although methylation is favored in black waters, photodegradation counterpoints this formation, thus regulating the methylmercury burden in the water column. (AU) | |
| Processo FAPESP: | 00/13517-1 - Fluxos de mercúrio na bacia do Rio Negro, Amazônia |
| Beneficiário: | Wilson de Figueiredo Jardim |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 02/03395-1 - Avaliação da contaminação da Bacia do Rio Negro por compostos organomercuriais |
| Beneficiário: | Márcia Cristina Bisinoti |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |