土壤中铅铜锌镉的吸附特性

Adsorption Characteristics of Soils for Lead,Copper,Zinc and Cadmium

以徐州王庄矿(WZK)、奎河(KH)、背景-1(BG-1)和背景-2(BG-2)等4个土壤样品为供试对象,加入不同浓度梯度的铅、铜、锌、镉离子,通过静态实验研究了铅、铜、锌、镉的吸附特性。结果表明,土壤对4个重金属的吸附量与加入到土壤中的重金属离子浓度呈正相关性,它们之间大部分满足线性相关关系。在4个土壤样品中加入铅、铜、锌、镉离子的初始浓度比为10∶10∶10∶1时,平衡浓度为CZn>CCu>CPb>CCd,吸附量为SCd>SPb>SCu>SZn,4个土壤样品对铅、铜、锌、镉离子的吸附能力依次为WZK>KH>BG-2>BG-1。在所选实验条件下,土壤对铅、铜、锌、镉的吸附能力受土壤中铅、铜、锌、镉的含量、土壤有机质含量、阳离子交换量、土壤饱和含水量和土壤的pH值影响较大。

Four kinds of soils, namely KH （rice-growing soil from coal mining area）, WZK （vegetable soil from polluted irrigation area）, BG-1 （background for vegetable soil） and BG-2 （background for rice-growing soil） were collected from Xuzhou city for this adsorption experiment. The heaW metals of Pb^2＋ , Cu^2＋ , Zn^2＋ , Cd^2＋ with concentration ratios of 10 ： 10 ： 10 ： 1 in different concentration gradients were added to the soils to study the static adsorption characteristics for these heaW metals. The results show that the adsorption capacity of these 4 kinds of soils for Pb^2＋ , Cu^2＋ , Zn^2＋ , Cd^2＋ is in the order of WZK 〉 KH 〉 BG-2 〉 BG-1. And the results also indicate that adsorption of Pb, Cu, Zn, Cd by the soils are greatly affected by the factors of Pb, Cu, Zn, Cd and organic matter contents in soils, cation change capacity of the soils, saturation moisture contents of soils and soil pH values.