Effect of dissolved organic matter on mercury release from water body |
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Authors: | Xi Chen Yongkui Yang Dingyong Wang and Xiao Liu |
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Institution: | 1. Key Laboratory of Eco-Environments in Three Gorges Reservoir Region(Ministry of Education), College of Resources and Environment,Southwest University, Chongqing 400715, China;Department of Chemistry, Biology and Agriculture in Anshun College, Anshun 56100 2. Key Laboratory of Eco-Environments in Three Gorges Reservoir Region(Ministry of Education), College of Resources and Environment,Southwest University, Chongqing 400715, China 3. Key Laboratory of Eco-Environments in Three Gorges Reservoir Region(Ministry of Education), College of Resources and Environment,Southwest University, Chongqing 400715, China;Chongqing Engineering Research Center for Agricultural Non-Point Source Pollutio |
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Abstract: | Dissolved organic matter (DOM) plays an important role in the process of mercury release from water body. In this study, the
influence of DOM from different sources (DOMR, DOMS and DOMH, extracted from rice straw, compost and humic soil respectively)
on mercury reduction was investigated. The molecular weight distribution and chemical composition of DOM from each source were
determined using ultrafiltration membrane technique and elemental analysis respectively. The result showed that mercury release from
DOM-added samples was much lower than the control; the lowest mercury release flux was observed in the treatment of DOMH,
25.02% of the control, followed by DOMS and DOMR, 62.46% and 64.95% of the control, respectively. The higher saturation degree
and lower molecular weight of DOMH was responsible for the highest inhibition degree on the mercury release. The link between
DOMH, concentration and mercury flux was also estimated and the result showed that mercury flux was increased with DOMH at lower
concentration, while decreased with DOMH at higher concentration. Different mechanism dominated the influence of DOM on mercury
release with variation of DOM concentration. |
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Keywords: | dissolved organic matter mercury release inhibition molecular weight |
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