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岩溶区石灰性土壤对Cd2+吸附的解吸特性及滞后效应

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朱丹尼, 邹胜章, 周长松, 李录娟. 岩溶区石灰性土壤对Cd2+吸附的解吸特性及滞后效应[J]. 环境化学, 2016, 35(7): 1407-1414. doi: 10.7524/j.issn.0254-6108.2016.07.2015120402
引用本文: 朱丹尼, 邹胜章, 周长松, 李录娟. 岩溶区石灰性土壤对Cd2+吸附的解吸特性及滞后效应[J]. 环境化学, 2016, 35(7): 1407-1414. doi: 10.7524/j.issn.0254-6108.2016.07.2015120402
shu
ZHU Danni, ZOU Shengzhang, ZHOU Changsong, LI Lujuan. Desorption characteristics and hysteresis of adsorbed cadmium in calcareous soils on karst area[J]. Environmental Chemistry, 2016, 35(7): 1407-1414. doi: 10.7524/j.issn.0254-6108.2016.07.2015120402
Citation: ZHU Danni, ZOU Shengzhang, ZHOU Changsong, LI Lujuan. Desorption characteristics and hysteresis of adsorbed cadmium in calcareous soils on karst area[J]. Environmental Chemistry, 2016, 35(7): 1407-1414. doi: 10.7524/j.issn.0254-6108.2016.07.2015120402
shu

岩溶区石灰性土壤对Cd2+吸附的解吸特性及滞后效应

  • 1.

    中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室, 桂林, 541000

  • 基金项目:

    国土资源部地质调查项目（1212011121166），973计划课题项目（2011CB201001），中国地质科学院岩溶地质研究所基本科研业务费项目（2014030）共同资助.

Desorption characteristics and hysteresis of adsorbed cadmium in calcareous soils on karst area

  • 1.

    Institute of Karst Geology, Chinese Academy of Geological Sciences/Key Laboratory of Karst Dynamics, Ministry of Land and Resources & Guanxi Zhuang Autonomous Region, Guilin, 541000, China

  • Fund Project: Supported by the Geological Survey Project of Ministry of Land and Resources(1212011121166), National Basic Research Program of China(2011CB201001), Basic Scientific Research Operating Expenses of IKG(2014030).

  • 摘要: 采用一次平衡法对Cd2+在岩溶区典型石灰性土壤（棕色石灰土和黑色石灰土）中的解吸特性及滞后效应进行研究.结果表明，Cd2+在两种石灰性土壤中的解吸量及解吸率均随初始Cd2+浓度和吸附量的增加而增大，解吸量与吸附量呈极显著二次幂函数关系；Cd2+于两种土壤中的解吸率均较小，分别为4.64%-28.93%（棕色石灰土）和2.27%-10.02%（黑色石灰土），显然黑色石灰土对Cd2+的固持性较好.Linear模型是描述Cd2+在2种石灰性土壤中解吸等温模型的最佳方程.Cd2+吸附-解吸等温线不重合，解吸等温线明显滞后于吸附等温线，表明滞后效应的存在.基于Freundlich系数、Cd2+分配系数及吸附量与解吸量间的差异3种方法计算滞后指数，计算结果表明，石灰土中Cd2+初始浓度越高则解吸滞后程度越大，且黑色石灰土中Cd2+的滞后程度略高于棕色石灰土.
    Abstract: Cadmium desorption characteristics and hysteresis by calcareous soils on karst area were investigated in batch sorption experiments. The results showed that the amount and rate of Cd2+ desorption increased with the initial concentration of cadmium and the amount of adsorbed Cd in the two calcareous soils.The relationship between amount of desorbed Cd2+ and sorbed Cd2+ was significantly quadratic power function. The quantity of Cd2+ desorbed from the soils after three desorption runs was small, varying between 4.64% to 28.93% for Brown rendzina, and 2.27% to 10.02% for Rendizina.Obviously the latter had higher retention for Cadmium. Both Cd2+ desorption isotherms were adequately described by Linear equation.In particular,there was an apparent sorption-desorption hysteresis of Cd2+ in soils. The extent of hysteresis was quantified based on the Freundlich exponent, the Cd2+ distribution coefficient,and the differences obtained from sorption and desorption amount of Cd2+. The results revealed that hysteresis indices significantly increased as the amount of Cd2+ in the systems increased.Higher hysteretic degree was obtained for Rendizina.
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  • 收稿日期:  2015-12-04
  • 刊出日期:  2016-07-15
朱丹尼, 邹胜章, 周长松, 李录娟. 岩溶区石灰性土壤对Cd2+吸附的解吸特性及滞后效应[J]. 环境化学, 2016, 35(7): 1407-1414. doi: 10.7524/j.issn.0254-6108.2016.07.2015120402
引用本文: 朱丹尼, 邹胜章, 周长松, 李录娟. 岩溶区石灰性土壤对Cd2+吸附的解吸特性及滞后效应[J]. 环境化学, 2016, 35(7): 1407-1414. doi: 10.7524/j.issn.0254-6108.2016.07.2015120402
shu
ZHU Danni, ZOU Shengzhang, ZHOU Changsong, LI Lujuan. Desorption characteristics and hysteresis of adsorbed cadmium in calcareous soils on karst area[J]. Environmental Chemistry, 2016, 35(7): 1407-1414. doi: 10.7524/j.issn.0254-6108.2016.07.2015120402
Citation: ZHU Danni, ZOU Shengzhang, ZHOU Changsong, LI Lujuan. Desorption characteristics and hysteresis of adsorbed cadmium in calcareous soils on karst area[J]. Environmental Chemistry, 2016, 35(7): 1407-1414. doi: 10.7524/j.issn.0254-6108.2016.07.2015120402
shu

岩溶区石灰性土壤对Cd2+吸附的解吸特性及滞后效应

  • 1. 中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室, 桂林, 541000
  • 收稿日期:  2015-12-04
基金项目:

国土资源部地质调查项目（1212011121166），973计划课题项目（2011CB201001），中国地质科学院岩溶地质研究所基本科研业务费项目（2014030）共同资助.

摘要: 采用一次平衡法对Cd2+在岩溶区典型石灰性土壤（棕色石灰土和黑色石灰土）中的解吸特性及滞后效应进行研究.结果表明，Cd2+在两种石灰性土壤中的解吸量及解吸率均随初始Cd2+浓度和吸附量的增加而增大，解吸量与吸附量呈极显著二次幂函数关系；Cd2+于两种土壤中的解吸率均较小，分别为4.64%-28.93%（棕色石灰土）和2.27%-10.02%（黑色石灰土），显然黑色石灰土对Cd2+的固持性较好.Linear模型是描述Cd2+在2种石灰性土壤中解吸等温模型的最佳方程.Cd2+吸附-解吸等温线不重合，解吸等温线明显滞后于吸附等温线，表明滞后效应的存在.基于Freundlich系数、Cd2+分配系数及吸附量与解吸量间的差异3种方法计算滞后指数，计算结果表明，石灰土中Cd2+初始浓度越高则解吸滞后程度越大，且黑色石灰土中Cd2+的滞后程度略高于棕色石灰土.

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