首页> 中文期刊> 《生态环境学报》 >砷和磷在不同污染类型土壤中的竞争吸附动力学

砷和磷在不同污染类型土壤中的竞争吸附动力学

         

摘要

Characteristics of adsorption/competitive adsorption of As and P in farmland soil (CK) and the soils contaminated by chemical pollutions (HG) and steelmaking (GT) were investigated in this paper. The results revealed the differences in adsorption/competitive adsorption mechanisms of As and P in different contaminated soils, which provided a solid theoretical support for the application of P fertilizer in hyperaccumulator remediation grounds. The results showed that: The adsorption/competitive adsorption process of As and P varies in different contaminated soils. The maximum adsorption amount of As in the HG, GT, and CK soils was 95.1, 100, and 95.9 mg·kg-1, respectively. The maximum adsorption amount of P was 148, 103, and 100 mg·kg-1, respectively. The existence of P inhibited the adsorption of As in those three kinds of soils. The reduction percentage of As in HG, GT, and CK soils is 45.6%, 57.3%, and 69.5%. On the contrary, as had a very slight inhibiting effect on the adsorption of P. The reduction percentage of P in HG, GT, and CK soils is 7.43%, 6.41%, and 16.0%. Due to the different content of Fe, Al, P in those three kinds of soils, the adsorption/competitive adsorption of As and P appeared to be different. Moreover, ligand exchange of As in contaminated soils were readily controlled by P.%采用吸附实验研究了化工污染土壤(HG)、钢铁冶炼污染土壤(GT)和未受污染的农田土壤(CK)中的砷和磷吸附及竞争吸附特征,以期解释不同污染土壤此种吸附的动力学差异,为应用超富集植物修复场地污染土壤时合理施用磷肥提供理论依据。结果表明,在HG、GT和CK土壤中砷和磷的吸附特征有所差异,砷的最大吸附量分别为95.1、100、95.9 mg·kg-1,磷的最大吸附量分别为148、103、100 mg·kg-1。磷的存在能明显抑制土壤对砷的吸附,HG、GT、CK土壤在添加磷后,对砷的吸附量降低幅度分别为45.6%、57.3%、69.6%。而砷的存在对磷的吸附的影响不大,HG、GT、CK土壤在添加砷后,对磷的吸附量降低幅度分别为7.43%、6.41%、16.0%。3种土壤中铁、铝和磷的含量不同造成了砷、磷吸附和竞争吸附的差异,并且污染土壤上砷的配位体交换作用更容易受到磷的抑制。

著录项

  • 来源
    《生态环境学报》 |2015年第4期|694-699|共6页
  • 作者单位

    广西大学农学院;

    广西南宁 530004;

    中国科学院地理科学与资源研究所;

    北京 100101;

    中国科学院地理科学与资源研究所;

    北京 100101;

    中国地质大学 北京 生物地质和环境地质国家重点实验室;

    北京 100083;

    中国地质大学 北京 水资源与环境学院;

    北京 100083;

    广西大学农学院;

    广西南宁 530004;

    中国科学院地理科学与资源研究所;

    北京 100101;

    广西大学农学院;

    广西南宁 530004;

    中国科学院地理科学与资源研究所;

    北京 100101;

    中国科学院地理科学与资源研究所;

    北京 100101;

    中国科学院地理科学与资源研究所;

    北京 100101;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 环境污染化学;
  • 关键词

    污染土壤; 砷; 磷; 吸附动力学; 竞争吸附;

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