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Distribuição Espacial De Mercúrio Total E Elementar E Suas Interações Com Carbono Orgânico, Área Superficial E Distribuição Granulométrica Em Sedimentos Superficiais Da Bacia Inferior Do Rio Paraíba Do Sul, Rj, Brasil
| Content Provider | Semantic Scholar |
|---|---|
| Author | Almeida, Marcelo Gomes De Souza, Cristina Maria Magalhães |
| Copyright Year | 2008 |
| Abstract | The identification of total mercury content in bottom sediments is useful to determine levels of environmental contamination and to identify contaminant sources. Meanwhile, the remobilization capacity of Hg is determined by its chemical form or the specific type of association with geochemical supports. The main objectives of the present study was to verify the distribution of total Hg and Hg in bottom sediments of the Paraíba do Sul River, and to identify the processes associated to its mobility using geochemistry tools such as grain size distribution, surface area and organic carbon concentration. Past anthropogenic sources of Hg in the lower portion of the Paraíba do Sul river were mainly related to gold mining at the Pomba, Muriaé and Paraíba do Sul rivers, and to the use of organic mercurial fungicides in sugarcane fields. The analyzed parameters presented the following results for the four studied sections: secondary estuary (102 ± 23.5 ng.g; 23.4 m.g; 1.69% and 26%), flooded areas (95.5 ± 38.2 ng.g; 22.7 m.g; 1.61% and 41%), main estuary (54.9 ± 102 ng.g; 9.12 m.g; 0.55 and 55%), and fluvial portion-RPS (49.9 ± 72.4 ng.g; 10.0 m.g; 0.71% and 62%). Data correlation analysis indicated that total Hg concentration is directly associated to the silt-clay fraction, surface area and organic carbon. The percentage distribution of Hg and total Hg in the different sections indicated that three major processes are controlling the immobilization and transport of mercury in the environment. Therefore, the largest Hg concentrations occur closer to their main source (since gold mining activities were mostly located in the fluvial portion); the diffuse input of Hg (e.g. runoff), and/or inputs from flooded areas and the secondary estuary, where oxic sediments contributed to a process of change from Hg to HgS or methylation. |
| File Format | PDF HTM / HTML |
| DOI | 10.21715/gb.v22i3.285 |
| Volume Number | 22 |
| Alternate Webpage(s) | http://www.geobrasiliensis.org.br/geobrasiliensis/article/download/285/pdf |
| Alternate Webpage(s) | https://doi.org/10.21715/gb.v22i3.285 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
