期刊论文详细信息
Química Nova
The attenuation of concentrations model: a new method for assessing mercury mobility in sediments
Wasserman, Julio C.1  Queiroz, Everaldo L.1  Universidade Federal Fluminense, Niterói1  Universidade Federal da Bahia, Salvador1 
关键词: mercury;    mobility;    sediments.;   
DOI  :  10.1590/S0100-40422004000100004
学科分类:化学(综合)
来源: Sociedade Brasileira de Quimica
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【 摘 要 】

In this work we propose a new approach for the determination of the mobility of mercury in sediments based on spatial distribution of concentrations. We chose the Tainheiros Cove, located in the Todos os Santos Bay, Brazil, as the study area, for it has a history of mercury contamination due to a chloro-alkali plant that was active during 12 years. Twenty-six surface sediment samples were collected from the area and mercury concentrations were measured by cold vapour atomic absorption spectrophotometry. A contour map was constructed from the results, indicating that mercury accumulated in a "hot spot" where concentrations reach more than 1 µg g-1. The model is able to estimate mobility of mercury in the sediments based on the distances between iso-concentration contours that determines an attenuation of concentrations factor. Values of attenuation ranged between 0.0729 (East of the hot spot, indicating higher mobility) to 0.7727 (North of the hot spot, indicating lower mobility).

【 授权许可】

Unknown   

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