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Product Description This digital document is a journal article from Atmospheric Environment, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser. Description: An investigation of air/surface exchange of mercury, performed at the Negro River Basin, (Amazonian region) in January 2003 and January 2004, is presented. Five sites were investigated: a flooding primary forest, a non-flooding primary forest and three deforested areas. The fluxes were estimated by using a dynamic flux chamber with sampling times varying between 6 and 12h. The average mercury flux in deforested sites (13.7+/-10.3pmolm^-^2h^-^1) was significantly higher than in forest sites (0.1+/-1.8pmolm^-^2h^-^1). Our results showed that deforestation could be responsible for significantly increasing soil Hg emissions, mainly because of the high soil temperatures reached in deforested sites. Atmospheric gaseous mercury concentrations were generally low when compared with background areas from the Northern hemisphere. The average atmospheric Hg concentrations were 1.4+/-0.9 and 0.4+/-0.2ngm^-^3 for forest and deforested sites, respectively.