Interactions of Heavy Metal Ions with Paddy Soils as Inferred from Wien Effect Measurements in Dilute Suspensions

JIANG Jun; LI Cheng-Bao; ZHAO An-Zhen; XU Ren-Kou; WANG Yu-Jun; S. P. FRIEDMAN

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Interactions of Heavy Metal Ions with Paddy Soils as Inferred from Wien Effect Measurements in Dilute Suspensions

机译：从稀悬浮液的维恩效应测量推论出重金属离子与水稻土的相互作用。

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Interactions of three heavy metal ions, Cu2+, Cd2+, and Pb2+, and, for comparison, Na+ with electrodialytic clay fractions (less than 2 pm in diameter) of four paddy soils as well as a yellow-brown soil as a control soil were evaluated based on measurements of the Wien effect in dilute suspensions with a clay concentration of 10 g kg-1 in four nitrate solutions of 2 × 10-4/z mol L-1, where z is the cation valence, and a nitric acid solution of 3 × 10-5 mol L-1. Field strengths ranging from 15 to 230 kV cm-1 were applied for measuring the electrical conductivities (ECs) of the suspensions. The mean free binding energies between the various cations and all of the soils determined from exchange equilibrium increased in the order: Na+ ＜ Cd2+ ＜ Cu2+ ＜ Pb2+. In general, the ECs of the suspensions in the sodium nitrate solution were smaller than those of the suspensions in the heavy metal solutions because of the lower electrophoretic mobility of sodium compared to the divalent cations. In terms of relative electrical conductivity-field strength relationships, relative electrical conductivity (REC) of suspensions containing various cations at field strengths larger than about 50 kV cm-1 were in the descending order: Na+ ＞ Cu2+ ＞ Cd2+ ＞ Pb2+ for all tested soils. A characteristic parameter of the REC-field strength curves, AREC200, REC at a field strength of 200 kV cm-1 minus that at the local minimum of the concave segment of the REC-field strength curves, characterized the strength of adsorption of the cations stripped off by the applied strong electrical field, and for all soils the values of AREC200 were generally in the order: Na+ ＜ Cu2+ ＜ Cd2+ ＜ Pb2+.

机译：评价了三种重金属离子Cu2 +，Cd2 +和Pb2 +的相互作用，并比较了Na +与四种稻田土壤以及作为对照土壤的黄棕色土壤中电渗析粘土级分（直径小于2 pm）的相互作用。基于在两种浓度为2×10-4 / z mol L-1的硝酸盐溶液中，粘土浓度为10 g kg-1的稀悬浮液中的维恩效应的测量结果，其中z为阳离子化合价，硝酸溶液为3×10-5摩尔L-1。施加15至230 kV cm-1的场强来测量悬浮液的电导率（ECs）。由交换平衡确定的各种阳离子与所有土壤之间的平均自由结合能按以下顺序增加：Na + ＜Cd2 + ＜Cu2 + ＜Pb2 +。通常，硝酸钠溶液中悬浮液的ECs比重金属溶液中悬浮液的ECs小，这是因为钠的电泳迁移率低于二价阳离子。就相对电导率-场强关系而言，场强大于约50 kV cm-1的含各种阳离子的悬浮液的相对电导率（REC）降序排列：所有测试土壤的Na +＞ Cu2 +＞ Cd2 +＞ Pb2 + 。 REC场强曲线的特征参数AREC200，REC在200 kV cm-1的场强减去REC场强曲线的凹形部分的局部最小值时的特征参数，表示阳离子的吸附强度通过施加强电场剥离，对于所有土壤，AREC200的值通常按以下顺序排列：Na + ＜Cu2 + ＜Cd2 + ＜Pb2 +。

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来源
《土壤圈（英文版）》 |2006年第6期|718-725|共8页
作者
JIANG Jun; LI Cheng-Bao; ZHAO An-Zhen; XU Ren-Kou; WANG Yu-Jun; S. P. FRIEDMAN;
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作者单位

Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China);

Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China);

Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China);

Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China);

Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China);

Institute of Soil, Water, and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Daganl Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250 (Israel);

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
binding energy; electrical conductivity; field strength; heavy metal ions; paddy soils;

机译：结合能;电导率;场强;重金属离子;水稻土;

Interactions of Heavy Metal Ions with Paddy Soils as Inferred from Wien Effect Measurements in Dilute Suspensions

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