3 documents found, page 1 of 1
Mercury speciation changes in waters of the sepetiba Bay, SE Brazil during tida...
Paraquetti, Heloísa Helena M.; Lacerda, Luiz Drude de; Almeida, Marcelo D.; Marins, Rozane Valente; Mounier, StephaneThis work describes changes in Hg speciation in water along the transport from Sepetiba Bay, SE Brazil, to the adjacent continental platform during tide events and in different seasons. The chemical evaluation of Sepetiba Bay waters showed that the bay exports suspended particulate material (SPM) impoverish in organic carbon to adjacent continental platform areas, mainly during the wet season and imports SPM en...
Mercury loss from soils following conversion from forest to pasture in Rondônia...
Almeida, Marcelo D.; Lacerda, Luiz Drude de; Bastos, Wanderley R.; Herrmann, João CarlosThis work reports on the effect of land use change on Hg distribution in Amazon soils. It provides a comparison among Hg concentrations and distribution along soil profiles under different land use categories; primary tropical forest, slashed forest prior to burning, a 1-year silviculture plot planted after 4 years of forest removal and a 5-year-old pasture plot. Mercury concentrations were highest in deeper (6...
Degassing de mercúrio em solo de floresta e pastagem em candeia do Jamari
Almeida, Marcelo D.; Lacerda, Luiz Drude de; Almeida, Ronaldo de; Oliveira, R. C.; Bastos, Wanderley Rodrigues; Marins, Rozane ValenteErosion and leaching are important processes of mercury release from superficial soil. However, experimental studies have shown that mercury emissions by degassing of contaminated and non-contaminated soils play an important role on mercury transfer from soil to air. Therefore, the objective of this work was to estimate the emission of Hg0 from soils under different uses (pasture and forest). And yet, compare t...