研究报告

  • 徐珺,曾敏,王光军,周航,杨文弢,辜娇峰,廖柏寒.2种组配改良剂修复镉砷复合污染稻田土壤的研究[J].环境科学学报,2018,38(5):2008-2013

  • 2种组配改良剂修复镉砷复合污染稻田土壤的研究
  • Remediation of paddy soil complexly polluted with cadmium and arsenic using 2 combined amendments
  • 基金项目:国家自然科学基金(No.41501344);农业部财政部科研专项(No.农办财函2016);湖南省重点学科建设项目(No.2006180)
  • 作者
  • 单位
  • 徐珺
  • 中南林业科技大学生命科学与技术学院, 长沙 410004
  • 曾敏
  • 中南林业科技大学环境科学与工程学院, 长沙 410004
  • 王光军
  • 中南林业科技大学生命科学与技术学院, 长沙 410004
  • 周航
  • 中南林业科技大学环境科学与工程学院, 长沙 410004
  • 杨文弢
  • 中南林业科技大学环境科学与工程学院, 长沙 410004
  • 辜娇峰
  • 中南林业科技大学环境科学与工程学院, 长沙 410004
  • 廖柏寒
  • 中南林业科技大学环境科学与工程学院, 长沙 410004
  • 摘要:将2种复合改良剂LI(碳酸钙+铁粉)和HI(羟基磷灰石+铁粉)施加于镉、砷复合污染稻田土壤,设置投加比例分别为1∶2、1∶1、2∶1,通过分析熟化后土壤的pH值、毒性浸出(TCLP提取态)镉、砷含量及交换态镉和砷含量,研究了复合改良剂同时固定这两种污染元素的效果.结果表明,施加LI使土壤pH值提高了0.60~1.21,降低了土壤TCLP提取态镉、交换态镉含量,以及TCLP提取态砷和交换态砷含量;与对照相比,配比为2∶1的LI使土壤TCLP提取态镉含量降低了60.97%,效果较好;配比为1∶2和1∶1的LI分别使TCLP提取态砷含量降低了29.81%、29.85%;配比为1∶2的LI使交换态砷含量降低了55.18%.施加HI同样提高了土壤的pH值(升高了0.51~0.73),同时降低了土壤中97.05%~98.09%的TCLP提取态镉含量,效果显著;施加HI略微提高了土壤TCLP提取态砷含量,但却略微降低了土壤交换态砷含量.在本实验条件下,综合考虑土壤中镉和砷的稳定化效果,LI的效果明显好于HI.其中,从TCLP提取态镉和砷含量来评价,2∶1的LI施用效果最佳;从交换态镉和砷含量来评价,1∶2的LI施用效果最佳.
  • Abstract:Two combined amendments, LI (calcium carbonate + iron powder) and HI (hydroxyapatite + iron powder) with ratios of 1:2, 1:1 and 2:1, were applied to a paddy soil complexly polluted with Cd and As. Through comparison of soil pH values, TCLP extractable contents of soil Cd and As, and exchangeable contents (using 0.01 mol·L-1 CaCl2) of soil Cd and As, the simultaneous stabilization effect of soil Cd and As was evaluated. The results showed that application of LI increased the soil pH values (ranging 0.60~1.21), reduced the contents of TCLP extractable Cd and extractable Cd and the contents of TCLP extractable As and extractable As in soil. Compared with the control, application of LI (2:1) decreased the TCLP extractable soil Cd by 60.97% with a significant stabilization effect of soil Cd. Application of LI with ratios of 1:2 and 1:1 declined the TCLP extractable contents of soil As by 29.81% and 29.85%, respectively, and application of LI with ratios of 1:2 declined the extractable As by 55.18%. The same as LI, compared with the control, application of HI also increased the soil pH values (ranging 0.51~0.73) and decreased the TCLP extractable contents of soil Cd by 97.05%~98.09%. Application of HI slightly increased the TCLP extractable content of soil As, but declined the exchangeable content of soil As. Under the experiment conditions, the comprehensive stabilization effect of LI for soil Cd and As was obviously better than that of HI. For stabilizing TCLP extractable Cd and As in paddy soil, the effects of LI (2:1) were the best; and for stabilizing extractable Cd and As, the effects of LI (1:2) were the best.

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