Leaching Characteristics and Kinetic Mechanism of Heavy Metals in Urban Soil

LI Xiao-ping; XU Chang-lin; ZHANG Xu; LIU Xian-yu; LIU Jie; HOU Kang; WANG Ji-wen; YANG Rui

doi:10.13961/j.cnki.stbctb.2014.06.008

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Leaching Characteristics and Kinetic Mechanism of Heavy Metals in Urban Soil

- Leaching Characteristics and Kinetic Mechanism of Heavy Metals in Urban Soil
- Bulletin of Soiland Water Conservation Vol. 33, Issue 6, Pages: 6-12(2014)
- 作者机构：
  
  陕西师范大学旅游与环境学院,陕西,西安,710062
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.06.008
  CLC：
- Published：2014
- 稿件说明：
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LI Xiao-ping, XU Chang-lin, ZHANG Xu, et al. Leaching Characteristics and Kinetic Mechanism of Heavy Metals in Urban Soil[J]. Bulletin of Soiland Water Conservation, 2014, 33(6): 6-12.
DOI：

LI Xiao-ping, XU Chang-lin, ZHANG Xu, et al. Leaching Characteristics and Kinetic Mechanism of Heavy Metals in Urban Soil[J]. Bulletin of Soiland Water Conservation, 2014, 33(6): 6-12. DOI： 10.13961/j.cnki.stbctb.2014.06.008.

摘要

以典型工业城陕西省铜川市土壤为研究对象

采用BCR(欧共体标准物质局)连续形态分级法和Hakanson潜在风险指数法分别研究了人类活动性元素Pb

Zn的形态分布特征、环境迁移与生态风险;利用振荡浸提动力学试验(25℃平衡振荡24 h)探讨了人工合成低氨基多羧酸(APCAs)乙二胺四乙酸(EDTA)、二乙烯三胺五乙酸(DTPA)和低分子有机酸(LMWOAs)抗坏血酸(Vc)对重金属Pb

Zn的淋溶解吸特征与动力学机制。结果表明

铜川市工业区土壤重金属污染程度严重

总体潜在生态风险程度较强;重金属Zn和Cu的环境迁移趋势较大。淋溶动力学试验表明

不同类型有机酸对土壤Pb

Cu和Zn的淋溶解吸具有相似的动力学过程

但淋溶速率和解吸量随有机酸的不同各异。重金属Pb

Cu和Zn各形态量之和与有机酸EDTA和DTPA淋溶解吸量呈指数关系

而与低分子有机酸Vc淋溶解吸量成线性关系。从而进一步表明低分子有机酸Vc与氨基多羧酸类有机酸EDTA和DTPA对土壤重金属Pb

Zn淋溶解吸机制不同。

Abstract

Taking the typical urban soil of Tongchuan City of Shaanxi Province as the research object

the morphological distribution characteristics

environmental migration and potential ecological risk of anthropic elements Pb

Zn were investigated by the modified BCR(the European Community Bureau of Reference) sequential extraction method and Hakanson potential ecological index method

respectively. The desorption characteristics and leaching kinetics of Pb

Zn by EDTA

DTPA and Vc were conducted with batch experiments for 24 h at 25℃. The results showed that the pollution from heavy metals Pb

Zn in soil of Tongchuan City industrial park was serious

and potential ecological risk was strong. The trend of heavy metal Zn and Cu mobility was high. The leaching kinetics experiment indicated that there were the similar processes in leaching and desorption of Pb

Zn by organic acid EDTA

DTPA and Vc

however

the leaching speed and desorption quantity were different with different acid. The sum of Pb

Zn in soil had a exponential function with their corresponding leaching and desorption concentrations by APCAs EDTA and DTPA

but had the linear function with those of Vc. The results would further infer that the mechanisms of leaching kinetic were different between EDTA

DTPA and Vc.

关键词

Keywords

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