| 钟来元,钟燕彬,杨杰文.六价铬在砖红壤中淋溶特征的模拟研究[J].农业环境科学学报,2016,35(5):901-906. |
| 六价铬在砖红壤中淋溶特征的模拟研究 |
| Characteristics of Cr(Ⅵ) leaching in oxisol under simulated column experiment |
| 投稿时间：2015-12-08 |
| DOI：10.11654/jaes.2016.05.012 |
| 中文关键词: 六价铬 砖红壤 淋溶-迁移 |
| 英文关键词: hexavalent chromium latosol leaching |
| 基金项目:国家自然科学基金面上项目(41371316);广东海洋大学大学生创新创业训练计划项目(CXXL2015059) |
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| 中文摘要: |
| 通过室内土柱淋溶实验,研究了六价铬在砖红壤中淋溶特征以及有机肥和陪伴离子[Cu(Ⅱ)、磷酸根]对该过程的影响,并探讨了模拟酸雨条件下,土壤中六价铬溶出特征。结果表明:高氧化铁含量砖红壤对Cr(Ⅵ)有很强吸附能力,当Cr(Ⅵ)输入量小于240 mg·kg-1水平,其在淋溶液中浓度低于二苯碳酰二肼比色法检测限。土壤添加有机肥后,初始阶段淋溶液Cr(Ⅵ)浓度较对照处理高,但经历一段时间后,则较对照处理小,这表明有机肥一定程度上可减少Cr(Ⅵ)淋溶量。Cu(Ⅱ)能提高土壤表面ζ-电位和促进Cr(Ⅵ)吸附,并降低砖红壤Cr(Ⅵ)淋溶量;磷酸根可减小土壤表面ζ-电位和土壤对Cr(Ⅵ)吸附量,从而促进Cr(Ⅵ)淋溶。模拟酸雨条件下,土壤中Cr(Ⅵ)淋溶量呈现出先逐渐增加后减少特征。当Cu(Ⅱ)存在时,尽管土壤中Cr(Ⅵ)保持量最大,但其在淋溶液中浓度却较对照低,说明Cu(Ⅱ)与Cr(Ⅵ)之间的相互作用有助于降低后者淋溶量。 |
| 英文摘要: |
| Understanding Cr(Ⅵ) leaching is important for assessments of groundwater and health risk of soil Cr. A simulated soil column experiment was conducted to examine the effects of organic fertilizer and coexisting ions on the release of soil Cr(Ⅵ) under simulated acid rain condition, using an oxisol. At Cr(Ⅵ) inputs less than 240 mg·kg-1, concentrations of Cr(Ⅵ) in leachate were below the detection limit of diphenylcarbazide colorimetric spectrophotometic method used in this study, which was attributed to the large adsorption capacity of Fe-rich soil for Cr(Ⅵ). In amendment of organic fertilizer, leaching of Cr(Ⅵ) was enhanced at the early stage, but reduced at the later stage, in comparison with the control, partially ascribed to the reduction of Cr(Ⅵ) to less mobile Cr(Ⅲ) on the soil surface by organic fertilizer. At the coexistence of Cu(Ⅱ), the mobility of Cr(Ⅵ) in the soil was inhibited because soil surface ζ-potential became more positive under the presence of Cu(Ⅱ) and Cr(Ⅵ) adsorption was then promoted. On the contrary, more Cr(Ⅵ) was leached out of the soil in the presence of phosphate because of competition for surface adsorption sites. Acidic rain increased the release of Cr(Ⅵ) in the soil during the initial period but decreased as the experiment prolonged. Overall, this study would be helpful for us to understand the mobility of Cr(Ⅵ) in oxisol and to assess the environmental risk of Cr(Ⅵ)-polluted soil. |
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