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当前位置: 首页 > 文章 > 不同类型离子对铅在(土娄)土微团聚体中吸附解吸的影响 西北农业学报 2014,23 (7) 201-207
Position: Home > Articles > Effects of Different Types of Ions on the Sorption and Desorption of Pb~(2+) in Micro-Aggregates from a Loess Soil Acta Agriculturae Boreali-occidentalis Sinica 2014,23 (7) 201-207

不同类型离子对铅在(土娄)土微团聚体中吸附解吸的影响

作  者：
白鸽;孙慧敏;王益权;林宇华
单  位：
西北农林科技大学资源环境学院
关键词：
(土娄)土;微团聚体;Pb2+;吸附;解吸
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。
译  名：
Effects of Different Types of Ions on the Sorption and Desorption of Pb~(2+) in Micro-Aggregates from a Loess Soil
作  者：
BAI Ge;SUN Huimin;WANG Yiquan;LIN Yuhua;College of Natural Resources and Environment,Northwest A&F University;Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China,Ministry of Agriculture;
关键词：
Loess soil;;Micro-aggregates;;Pb2+;;Sorption;;Desorption
摘  要：
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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