Effect of dissolved organic matter on adsorption and desorption of mercury by soils.
Effect of dissolved organic matter on adsorption and desorption of mercury by soils.
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DOI：
10.1016/s1001-0742(08)62155-5
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发表时间：
2008
影响因子：
6.9
通讯作者：
Yong-kui Yang;L. Liang;Ding-yong Wang
中科院分区：
文献类型：
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作者：
Yong-kui Yang;L. Liang;Ding-yong Wang
研究了不同溶解性有机质（DOM）对黄育铁土（XUF）和典型紫色土（TPUC）中Hg吸附和解吸的影响。从腐殖土、稻草和猪粪中提取DOM。DOM的存在明显降低了土壤对Hg的最大吸附量，最大吸附量比对照降低了40%，作为DOMH的命令（250.00 mg/kg）< DOMR（303.03 mg/kg）< DOMP XUF（322.58 mg/kg）< CK（对照416.67 mg/kg），TPUC（270.27 mg/kg）< DOMR（312.50 mg/kg）< DOMP（324.23 mg/kg）< CK（476.11 mg/kg）。DOM对Hg吸附的抑制作用在XUF中略弱于TPUC。同时，DOM促进了土壤中Hg的解吸。双常数方程和Elovich方程适用于描述汞在土壤中的吸附和解吸过程。DOM的存在使土壤对Hg的吸附速率降低。
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 (DOMH), rice straw (DOMR), and pig manure (DOMP). The presence of DOM obviously reduced Hg maximum adsorption capacity with up to 40% decreases over the control, being an order of DOMH(250.00 mg/kg)< DOMR(303.03 mg/kg) < DOMP(322.58 mg/kg) < CK (control 416.67 mg/kg) for the XUF and DOMH(270.27 mg/kg) < DOMR(312.50 mg/kg) < DOMP(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.