Effect of dissolved organic matter on adsorption and desorption of mercury by soils

文献类型： 外文期刊

第一作者： Yang Yongkui

作者： Yang Yongkui;Liang Li;Wang Dingyong;Wang Dingyong

作者机构：

关键词： Mercury (Hg);Dissolved organic matter (DOM);Adsorption;Desorption

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.9； 五年影响因子：5.6 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Effects of dissolved organic matter (DOM) on adsorption and desorption of Hg were investigated in two kinds of soils, Xanthi-Udic Ferralosols (XUF) and Typic Purpli-Udic Cambosols (TPUC). The DOM was obtained from humus soil (DOM{sub}H), rice straw (DOM{sub}R), and pig manure (DOM{sub}p). The presence of DOM obviously reduced Hg maximum adsorption capacity with up to 40% decreases over the control, being an order of DOM{sub}H (250.00 mg/kg)< DOM{sub}R (303.03 mg/kg) < DOM{sub}P (322.58 mg/kg) < CK (control 416.67 mg/kg) for the XUF and DOM{sub}H (270.27 mg/kg) < DOM{sub}R (312.50 mg/kg) < DOM{sub}P (324.23 mg/kg) < CK (476.11 mg/kg) for the TPUC, respectively. The inhibition of DOM on Hg adsorption was slightly weaker in XUF than in TPUC. Meanwhile, the DOM promoted Hg desorption from the soils. The kinetic models, the Two-constant equation and Elovich equation, were applicable to describe the adsorption and desorption processes of Hg in soils. The speed of Hg adsorption was consistently slowed down by the existence of DOM.

分类号： X21

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