Quantification of atmosphere - soil mercury fluxes by using a dynamic flux chamber: application at the Negro River basin, Amazon

Química Nova

Magarelli, Gabriella¹  Universidade Estadual de Campinas, Campinas¹  Fostier, Anne Hélène¹ 

关键词: mercury fluxes;    atmosphere-soil exchange;    flux chamber.;   

DOI  :  10.1590/S0100-40422005000600007

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Gaseous mercury sampling conditions were optimized and a dynamic flux chamber was used to measure the air/surface exchange of mercury in some areas of the Negro river basin with different vegetal coverings. At the two forest sites (flooding and non-flooding), low mercury fluxes were observed: maximum of 3 pmol m-2 h-1 - day and minimum of –1 pmol m-2 h-1 - night. At the deforested site, the mercury fluxes were higher and always positive: maximum of 26 pmol m-2 h-1 - day and 17 pmol m-2 h-1 - night. Our results showed that deforestation could be responsible for significantly increasing soil Hg emissions, mainly because of the high soil temperatures reached at deforested sites.

【 授权许可】

Unknown