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| 有机酸对几种土壤胶体吸附解吸镉离子的影响 | |
| 引用本文： | 张桂银,董元彦,李学垣,李瑛,李洪军.有机酸对几种土壤胶体吸附解吸镉离子的影响[J].土壤学报,2004,41(4):558-563. |
| 作者姓名： | 张桂银 董元彦 李学垣 李瑛 李洪军 |
| 作者单位： | 1. 河北农业大学资源与环境科学学院,河北,保定,071001;华中农业大学资源与环境科学学院,武汉,430070 2. 华中农业大学资源与环境科学学院,武汉,430070 3. 河北农业大学资源与环境科学学院,河北,保定,071001 |
| 基金项目： | 河北省自然科学基金(编号:399107)和国家自然科学基金(编号:49871043)项目资助 |
| 摘 要： | 用平衡法研究了有机酸对土壤胶体吸附 解吸Cd2 的影响。结果表明 ,黄棕壤、红壤、砖红壤胶体Cd2 最大吸附容量 (Qm)分别为 4 3 7、16 8、1 5 8mmolkg-1。在加入Cd2 浓度相同的条件下 ,土壤胶体Cd2 吸附量随有机酸浓度的升高呈峰形曲线变化。当有机酸与Cd2 共存时 (竞争吸附 ) ,低浓度的草酸 (小于0 5～ 2mmolL-1)或柠檬酸 (小于 0 0 2 5～ 0 2mmolL-1)提高Cd2 吸附量 ,高浓度的草酸或柠檬酸能降低Cd2 吸附量。吸附有机酸后的土壤胶体 (次级吸附 )对Cd2 次级吸附量的影响与竞争吸附一致 ,但两者的Cd2 吸附量变化幅度不一样。这是由于两种吸附体系液相中有机酸残留浓度不同所致。土壤胶体吸附态Cd2 的解吸结果表明 ,草酸浓度不仅影响Cd2 的总解吸量、总解吸率 ,还影响土壤胶体表面KNO3 解吸态与DTPA解吸态Cd2 的分配比例 |
| 关 键 词： | 草酸 柠檬酸 镉离子 土壤胶体 吸附与解吸 |
| 收稿时间： | 2003/6/26 0:00:00 |
| 修稿时间： | 2003/11/3 0:00:00 |
SORPTION-DESORPTION OF Cd2+ ION IN SEVERAL SOIL COLLOIDS IN THE PRESENCE OF OXALIC ACID AND CITRIC ACID |
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| Zhang Guiyin,Dong Yuanyan,Li Xueyuan,Li Ying and Li Hongjun.SORPTION-DESORPTION OF Cd2+ ION IN SEVERAL SOIL COLLOIDS IN THE PRESENCE OF OXALIC ACID AND CITRIC ACID[J].Acta Pedologica Sinica,2004,41(4):558-563. | |
| Authors: | Zhang Guiyin Dong Yuanyan Li Xueyuan Li Ying and Li Hongjun |
| Affiliation: | Zhang Guiyin 1,2 Dong Yuanyan 2 Li Xueyuan 2 Li Ying 1 Li Hongjun 1 |
| Abstract: | The effects of organic acids on Cd2+ sorption desorption in testing soil colloids were studied by batch meth ods.The results showed the maximum amount of Cd2+ sorption by yellow brown soil,red soil and latosol was 43.7,16.8 and 1.58 mmol kg-1 respectively.At the same concentration of Cd2+ added,the amount of Cd2+ sorption was generally characterized as peak like curves with the increase of organic acids concentration.When organic acids and Cd2+ simultaneously were intro duced in testing systems(competitive sorption),lower concentration of oxalic acid(<0.5~2 mmol L-1) or citric acid(<0.025~0.2 mmol L-1) promoted Cd2+ sorption,and higher concentration of them decreased the Cd2+ sorption amount.The effect of Cd2+ sequential sorption on the soil colloids previously adsorbed organic acids(sequential sorption) was almost same as that of competitive sorption,however,the variation of both amount of Cd2+ competitive sorption and sequential sorption were not same.Its reason was related to content of residual organic acids in both sorption systems.The results of desorption tests demonstrated that the concentration of oxalic acid impacted total amount and total rate of Cd2+ desorption as well as distribution ratio of Cd2+ desorbed by KNO3 and by DTPA on surfaces of testing soil colloids. |
| Keywords: | Oxalic acid Citric acid Cadmium ion Soil colloids Sorption desorption |
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