湖北农业科学 ›› 2018, Vol. 57 ›› Issue (6): 43-46.doi: 10.14088/j.cnki.issn0439-8114.2018.06.010

• 资源·环境 • 上一篇    下一篇

低分子有机酸对石灰性土壤中Pb、Cd的淋洗效应

刘桂华1, 任婧1, 胡岗1, 秦松1, 2, 3, 范成五1, 2   

  1. 1.贵州省农业科学院土壤肥料(农业资源与环境)研究所,贵阳 550006;
    2.贵州省农业资源与环境工程技术研究中心,贵阳 550006;
    3.农业部贵州耕地保育与农业环境科学观测实验站,贵阳 550006
  • 收稿日期:2017-10-30 出版日期:2018-03-25 发布日期:2020-01-06
  • 通讯作者: 范成五,副研究员,主要从事农业资源利用与环境研究,(电子信箱)gzfcw@163.com
  • 作者简介:刘桂华(1989-),女,贵州铜仁人,助理研究员,硕士,主要从事农业环境重金属污染治理研究,(电话)15185071003(电子信箱)740768802@qq.com。
  • 基金资助:
    贵州省科学技术基金项目(黔科合J字[2013]2174号); 贵州省农业科学院青年基金[2017]13号; 贵州省科研机构服务企业行动计划项目(黔科合服企[2015]4007)

Effects of Low Molecular Organic Acids on the Removing of Pb,Cd in Calcareous Soils

LIU Gui-hua1, REN Jing1, HU Gang1, QIN Song1,2,3, FAN Cheng-wu1,2   

  1. 1.Institute of Soil and Fertilizer(Resources and Environment for Agriculture), Guizhou Academy of Agricultural Sciences,Guiyang 550006,China;
    2.Guizhou Research Center for Agricultural Resources and Environmental Engineering Technology,Guiyang 550006,China;
    3.Field Monitoring Experimental Station for Cultivated Land Preservation and Agro-environment in Guizhou, Ministry of Agriculture of China,Guiyang 550006,China
  • Received:2017-10-30 Online:2018-03-25 Published:2020-01-06

摘要: 采用振荡淋洗方法研究柠檬酸、苹果酸、酒石酸3种常见低分子有机酸对污染石灰土壤中Pb、Cd的淋洗净化效应。结果表明,与对照(CK)相比,随着3种有机酸添加浓度的增加,均可显著增加土壤中Cd的解吸量(P<0.05);而苹果酸、酒石酸在各添加浓度下均能不同程度抑制土壤中Pb的解吸,柠檬酸在较低添加浓度下抑制,而在较高浓度下(>10.0 mmol/L)又能促进Pb的解吸。Pb、Cd的解吸率曲线表明,同一有机酸对土壤中不同重金属(Cd、Pb)的解吸规律(促进解吸、抑制解吸)存在明显差异,不同有机酸对土壤中同一重金属(Cd或Pb)的解吸量也存在明显差异。Pb的解吸分配系数(Kd)呈钟形分布,而Cd的Kd则随有机酸浓度的增加呈减小趋势。

关键词: 低分子有机酸, 解吸, 石灰性土壤, 镉,

Abstract: The effects of citric acid, malic acid and tartaric acid on leaching of Pb,Cd in contaminated soil were researched by oscillating methods. The results showed that compared with the control,desorption amount of Cd significantly increased with the addition of citric acid,malic acid and tartaric acid(P<0.05). Malic acid and tartaric acid inhibited the desorption of Pb in different degree. Citric acid in low concentration inhibited but promoted in high concentration(>10.0 mmol/L) the desorption of Pb. The desorption rate curve indicated that the effect of the same or different organic acid on different heavy metal or the same heavy metal(promotion and inhibition) varied obviously. The desorption distribution coefficient of Pb(Kd) presented bell-shaped distribution,but the Kd of Cd decreased with organic acid increasing.

Key words: low molecular organic acids, leaching desorption, calcareous soil, Cd, Pb

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