Characteristics of Copper Adsorption-Desorption by Soils and Its Responses to Land Use

LIU Qing; ZHAO Xi-mei; SHU long; LU Zhao-hua

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Characteristics of Copper Adsorption-Desorption by Soils and Its Responses to Land Use

- Characteristics of Copper Adsorption-Desorption by Soils and Its Responses to Land Use
- Bulletin of Soiland Water Conservation Vol. 31, Issue 5, Pages: 128-131(2012)
- 作者机构：
  
  1. 滨州学院/山东省黄河三角洲生态环境重点实验室,山东,滨州,256603
  2. 博兴县农业局能源环保站, 山东博兴,256500
  3. 中国矿业大学恢复生态学研究所,北京,100083
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2012
- 稿件说明：
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LIU Qing, ZHAO Xi-mei, SHU long, et al. Characteristics of Copper Adsorption-Desorption by Soils and Its Responses to Land Use[J]. Bulletin of Soiland Water Conservation, 2012, 31(5): 128-131.
DOI：

LIU Qing, ZHAO Xi-mei, SHU long, et al. Characteristics of Copper Adsorption-Desorption by Soils and Its Responses to Land Use[J]. Bulletin of Soiland Water Conservation, 2012, 31(5): 128-131. DOI：

摘要

用吸附平衡法研究黄河三角洲地区土壤对Cu

的吸附和解吸特征

对比了农田和未利用地土壤吸附与解吸能力的差异

并分析了差异形成的原因。结果表明

土壤对Cu

的吸附量随着平衡液Cu

质量浓度的增加而增加

其吸附作用可用Langmuir

Temkin和Freundlich方程来拟合

以Langmuir方程拟合结果最佳。根据Langmuir方程计算出的两种土壤最大吸附量分别为3 961mg/kg和3 521mg/kg

农田土壤对Cu

的吸附能力强于未利用地土壤;土壤Cu2+的解吸量远远小于土壤对Cu

的吸附量

与农田土壤相比

未利用地土壤Cu

的解吸有滞后现象;农田土壤和未利用地土壤Cu

的解吸率变化范围分别为0.1%～0.35%和0.15%～1.8%

农田土壤的解吸率明显低于未利用地土壤。综合分析认为

两种土壤吸附-解吸特征的差异与农田土壤具有较高的有机质含量

从而在土壤胶体表面形成较多的吸附位点有关。

Abstract

The characteristics of Cu2+ adsorption-desorption by soils in the Yellow River Delta were studied using isothermal equilibrium adsorption method.Differences in the adsorption-desorption capacity of soils in farmland and unused land were compared and the reasons for the differences were analyzed. Results showed that the adsorption capacity for the two types of soils increased with Cu2+ equilibrium concentration. he adsorption characteristics could be simulated by Langmiur

Freundlich and Temkin models.Langmuir model was found to be the best one. The maximum adsorption capacity of soil was 3961mg/kg for farmlandand 3 521mg/kg for unused land

respectively. The Cu2+ adsorption capacity of soil in farmland was much higher than that in unused land. The Cu2+ desorption capacity was far lower than the Cu2+adsorption capaci-ty. There was an obvious lag period of the Cu2+ desorption by soil in unused land

as compared with that in farmland. The Cu2+ desorption ratio for soil in unused land was greater than that in farmland

and the de-sorption ratio was between 0.1% and 0.35%in farmland and between 0.15% and 1.8%in unused land

respectively. The results from the comprehensive analysis suggest that the differences in the adsorption-desorption for the two types of soils are related with soil organic matter content which leads to more adsorp-tion points on the soil colloid surface in farmland.

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