| 不同类型离子对铅在(土娄)土微团聚体中吸附解吸的影响 |
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| 引用本文： | 白 鸽,孙慧敏,王益权,林宇华.不同类型离子对铅在(土娄)土微团聚体中吸附解吸的影响[J].西北农业学报,2014,23(7):201-207. |
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| 作者姓名： | 白 鸽 孙慧敏 王益权 林宇华 |
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| 作者单位： | （1.西北农林科技大学 资源环境学院，陕西杨凌 712100；2.农业部西北植物营养与农业环境重点实验室，陕西杨凌 712100） |
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| 基金项目： | 国家自然科学基金（21207106）；中央高校科研专项基金（QN2011151）。 |
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| 摘 要： | 采用等温平衡吸附法研究((土娄))土不同粒径微团聚体在Na+和Ca2+作为共存离子条件下对Pb2+的吸附和解吸特点。结果表明,Freundlich方程能够较好地拟合不同共存离子条件下各粒径微团聚体对Pb2+的吸附特征,Na+作为共存离子的环境下,更有助于(土娄)土微团聚体对铅的吸附,并且最大吸附量随比表面积、CEC及有机质含量增加而增大,而在共存离子为Ca2+的情况下无此现象。在中偏碱的土壤环境下,Ca(NO3)2作为解吸液比NaNO3更能大量地解吸(土娄)土微团聚体中吸附的Pb2+。随着Pb2+吸附量的增加,以NaNO3为解吸液的微团聚体对Pb2+的解吸率不断下降,但以Ca(NO3)2为解吸液时解吸率不断上升。所以土壤环境中,共存离子为Ca2+时,(土娄)土微团聚体对Pb2+的吸附率低,解吸率却高;共存离子为Na+时,对Pb2+的吸附率高,解吸率却低。
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| 关 键 词： | 土娄土 微团聚体 Pb2+ 吸附 解吸 |
Effects of Different Types of Ions on the Sorption and Desorption of Pb2+ in Micro- Aggregates from a Loess Soil |
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| BAI Ge,SUN Huimin,WANG Yiquan and LIN Yuhua.Effects of Different Types of Ions on the Sorption and Desorption of Pb2+ in Micro- Aggregates from a Loess Soil[J].Acta Agriculturae Boreali-occidentalis Sinica,2014,23(7):201-207. |
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| Authors: | BAI Ge SUN Huimin WANG Yiquan and LIN Yuhua |
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| Abstract: | Different particle size of soil micro-aggregates were separated from undisturbed soil samples from a loess soil in Yangling Shaanxi, China. The sorption and desorption characteristics of Pb2+ by the particle separates under the Na+and Ca2+ co-existing ions were studied by the isothermal balance adsorption method. The results show that adsorption characteristics of Pb2+ by different size fractions of the micro-aggregates under the different co-existing ions fit well the Freundlich isotherm. Na+is more helpful to the adsorption of Pb2+ by the size fractions than Ca2+ as the co-existing ion, and in addition to Ca2+, the specific surface area, CEC and organic matter content are increasing with the increase in the maximum adsorption capacity of Pb2+. Ca2+ can desorb the Pb2+ on micro- aggregate better than Na+as desorption solution in the alkali soil environment. Along with the increase of the adsorption amount of Pb2+, the desorption rate of Pb2+ of micro-aggregates is declining for NaNO3, while rising for Ca(NO3)2. So in the soil environment, the adsorption of Pb2+ rate for micro-aggregates from a loess soil is low, and the desorption rate is high when Na+as the co-existing ion.Whereas Ca2+ is just the opposite. |
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