Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Distribution of mercury in different soils of Amazonia's mid-Negro River Basin: influence of organic matter on mercury's biogeochemical cycle

Full text
Author(s):
Luciana Camargo de Oliveira [1] ; Ricardo Lima Serudo [2] ; Wander Gustavo Botero [3] ; André Gustavo Ribeiro Mendonça [4] ; Ademir dos Santos [5] ; Julio Cesar Rocha [6] ; Fernando da Silva Carvalho Neto [7]
Total Authors: 7
Affiliation:
[1] Universidade Estadual Paulista. Instituto de Química de Araraquara - Brasil
[2] Universidade Estadual Paulista. Instituto de Química de Araraquara - Brasil
[3] Universidade Estadual Paulista. Instituto de Química de Araraquara - Brasil
[4] Universidade Estadual Paulista. Instituto de Química de Araraquara - Brasil
[5] Universidade Estadual Paulista. Instituto de Química de Araraquara - Brasil
[6] Universidade Estadual Paulista. Instituto de Química de Araraquara - Brasil
[7] Universidade Estadual Paulista. Instituto de Química de Araraquara - Brasil
Total Affiliations: 7
Document type: Journal article
Source: Química Nova; v. 30, n. 2, p. 274-280, 2007-04-00.
Field of knowledge: Physical Sciences and Mathematics - Chemistry
Abstract

Soils play an important role in the biogeochemical cycle of mercury as a sink for and source of this metallic species to atmospheric and hydrological compartments. In the study reported here, various types of soil were evaluated to ascertain the influence of parameters such as pH, organic matter content, Fe, Al, sand, silt, clay, C/H, C/N, C/O atomic ratios, and cation exchange capacity on the distribution of Hg in Amazonia's mid-Negro River basin. The data obtained were interpreted by multivariate exploratory analyses (hierarchical cluster analysis and principal component analysis), which indicated that organic matter plays an important role in mercury uptake in the various soils studied. The soils in floodable areas were found to contain 1.5 to 2.8-fold higher Hg concentrations than those in non-floodable areas. Since these soils are flooded almost year-round, they are less available to participate in redox processes at the soil/atmosphere interface. Hence, floodable areas, which comprise humic-rich soils, accumulate more mercury than non-floodable soils, thus playing an important role in the biogeochemical cycle of Hg in Amazonia's mid-Negro River basin. (AU)

FAPESP's process: 00/13517-1 - Mercury fluxes in the Rio Negro Basin, Amazon
Grantee:Wilson de Figueiredo Jardim
Support Opportunities: Research Projects - Thematic Grants