| Grant number: | 00/13517-1 |
| Support Opportunities: | Research Projects - Thematic Grants |
| Start date: | May 01, 2001 |
| End date: | August 31, 2004 |
| Field of knowledge: | Physical Sciences and Mathematics - Chemistry - Analytical Chemistry |
| Principal Investigator: | Wilson de Figueiredo Jardim |
| Grantee: | Wilson de Figueiredo Jardim |
| Host Institution: | Instituto de Química (IQ). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil |
| City of the host institution: | Campinas |
Abstract
This thematic project is of strategic importance for Brazil since it intends to generate detailed knowledge about the dynamics of the chemical element mercury in the Negro River basin of the Amazon region. To attain this principal objective, the project unites a multi-institutional team from UNICAMP, UNESP and PUC-Campinas, which is engaged in quantifying the chemical componentes in the several potential reservoirs for mercury, as well as in measuring the flux of these species between water and the mechanisms and the controlling agents of these processes. To attain this principal objective, the team proposes the following activities: a) validation of analytical methods to determine mercury in the several matrices of interest, followed by quantification of mercury in the several reservoirs and determination of the metal flux between these reservoirs; b) study of the dynamics of transfer of mercury in the water/atmosphere interface, identifying and quantifying the fluxes between these matrices as well as the role played by such environmental parameters as the pH of the water, the intensity of solar radiation, the quantity of dissolved organic matter and the presence of natural oxidizing agents, in order to establish mechanisms which explain the formation and transfer of gaseous mercury; c) study of the dynamics of the transfer of mercury present in the soil to the atmosphere, identifying and quantifying the emission and deposition of gaseous mercury between these interfaces ande determining their dependence on the type of soil and the amount of plant coverage, as well as the influence of factors such as the humidity and temperature of the soil, the intensity of light and the temperature and humidity of the air; d) quantify the distribution of mercury in the river basin as a function of the type of soil, to establish the role that humic material has in the speciation of mercury in the soil and its leaching into the aquatic system. (AU)
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