两种离子液体对Cd<sup>2+</sup>在四种土壤上吸附的影响

宣亮; 王玉军; 刘海龙; 周东美; 孙庆业

文章摘要

宣亮,王玉军,刘海龙,周东美,孙庆业.两种离子液体对Cd²⁺在四种土壤上吸附的影响[J].农业环境科学学报,2016,35(6):1056-1063.

两种离子液体对Cd²⁺在四种土壤上吸附的影响

Effects of two ionic liquids on Cd²⁺ adsorption on four soils

投稿时间：2016-01-01

DOI：10.11654/jaes.2016.06.006

中文关键词: Cd²⁺ 2,3-吡啶二羧酸咪唑-4,5-二羧酸土壤吸附

英文关键词: Cd²⁺ 2,3-Pyridinedicarboxylic acid 4,5-Imidazoledicarboxylic acid soils adsorption

基金项目:国家环保部公益性项目(20140941);国家自然科学基金项目(41422105);江苏省自然科学基金项目(BK20130050)

作者	单位	E-mail
宣亮	安徽大学资源与环境工程学院, 合肥 230601 中国科学院南京土壤研究所土壤环境与污染修复重点实验室, 南京 210008
王玉军	中国科学院南京土壤研究所土壤环境与污染修复重点实验室, 南京 210008	yjwang@issas.ac.cn
刘海龙	中国科学院南京土壤研究所土壤环境与污染修复重点实验室, 南京 210008
周东美	中国科学院南京土壤研究所土壤环境与污染修复重点实验室, 南京 210008
孙庆业	安徽大学资源与环境工程学院, 合肥 230601	sunqingye@ahu.edu.cn

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中文摘要:

研究了2,3-吡啶二羧酸和咪唑-4,5-二羧酸两种离子液体阳离子部分对Cd²⁺在四种不同性质土壤上吸附的影响。结果表明,离子液体的存在显著影响了Cd²⁺在土壤中的吸附,与对照相比,添加1 mmol·L^-1 2,3-吡啶二羧酸使得Cd²⁺在武进漂洗型水稻土、吴县潴育型水稻土、南京黄褐土和宜兴棕红壤四种土壤上的最大吸附量分别降低209、834、667、509 mg·kg^-1,而添加1 mmol·L^-1咪唑-4,5-二羧酸使Cd²⁺最大吸附量分别降低226、54、124、81 mg·kg^-1,2,3-吡啶二羧酸对Cd²⁺在供试土壤上吸附量的影响显著大于咪唑-4,5-二羧酸。基于离子选择电极分析了平衡液中自由态Cd²⁺含量,发现两种离子液体都能与Cd²⁺络合,从而降低平衡液中Cd²⁺含量,其中2,3-吡啶二羧酸与Cd²⁺的络合能力大于咪唑-4,5-二羧酸。两种离子液体进入环境,会使Cd²⁺在土壤上的吸附量减少,从而增加Cd²⁺的移动性和环境风险。

英文摘要:

The effects of 2,3-Pyridinedicarboxylic acid and 4,5-Imidazoledicarboxylic acid on Cd²⁺ adsorption on four soils with different characteristics(Wujin, Wuxian, Nanjing and Yixing soils) were investigated. Results showed that the adsorption of Cd²⁺ on soils depended on the characteristics of soils. The presence of ionic liquids significantly affected the adsorption of Cd²⁺ on soils. Compared with the control, the presence of 1 mmol·L^-1 2,3-Pyridinedicarboxylic acid reduced the maximum adsorption of Cd²⁺ on Wujin, Wuxian, Nanjing and Yixing soils by 209, 834, 667 and 509 mg·kg^-1, respectively, whereas adding 1 mmol·L^-1 4,5-Imidazoledicarboxylic acid decreased the maximum Cd²⁺ adsorption by 226, 54, 124 and 81 mg·kg^-1 on Wujin, Wuxian, Nanjing, and Yixing soils, respectively. Therefore, 2,3-Pyridinedicarboxylic acid showed greater effects on Cd²⁺ adsorption on tested soils than 4,5-Imidazoledicarboxylic acid did. The free Cd²⁺ ions in the equilibrium solution measured by Cd ion selective electrode showed that both ionic liquids were able to complex with Cd²⁺, leading to decreased Cd²⁺ ion concentrations in soil solution, and consequently reduced Cd²⁺ adsorption on soils. The complexing capability of 2,3-Pyridinedicarboxylic was stronger than that of 4,5-Imidazoledicarboxylic acid, which resulted in greater inhibition of Cd²⁺ sorption on soils. Our results indicate that ionic liquids could decrease the adsorption of Cd²⁺ on soils, but increase the mobilization and environmental risk of soil Cd²⁺.

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