| 土层性质对铜和铅在土壤中保持和迁移的影响 |
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| 作者姓名： | B. CERQUEIRA E. F. COVELO M. L. ANDRADE F. A. VEGA |
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| 作者单位： | Department of Plant Biology and Soil Science;University of Vigo; |
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| 基金项目： | Supported by the Ministry of Science and Innovation of Spain (No.CGL2010-16765/BTE); the FEDER and the Xuntade Galicia in partnership with the University of Vigo through “Angeles Alvarino” and “Parga Pondal” research grants to F. A. Vega and E. F. Covelo,respectively |
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| 摘 要： | The mobility and bioavailability of heavy metals in soils is largely governed by sorption and desorption phenomena.Cu2+ and Pb2+ are among the most potentially toxic heavy metals and they are present,often concomitantly,in many polluting spills and in agrochemicals.The objective was to assess and compare the competitive sorption and desorption capacities and sorption hysteresis of Cu2+ and Pb2+,as well as their migration through the profiles of four natural soils:a Humic Umbrisol,an Umbric Cambisol,an Endoleptic Luvisol and a Humic Cambisol.In all horizons Pb2+ was invariably sorbed and retained to a greater extent than Cu2+.The sorption and retention of Cu2+ were most in?uenced by pH,e?ective cation exchange capacity(CECe) and Mn oxide content.On the other hand,the fixation capacity of Pb2+ was most in?uenced by pH,CECe,and Mn oxide and organic matter contents.pH and CECe were the individual soil properties most markedly in?uencing Cu2+ and Pb2+ sorption and retention.In all the horizons Pb2+ exhibited greater hysteresis than Cu2+.In each soil the hysteresis in the A horizon was greater than that in the B horizon,except in the Bt horizon of the Endoleptic Luvisol,due to its high pH and vermiculite content.Based on migration indices,Pb2+ was less mobile than Cu2+ in the studied soils.
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| 关 键 词： | desorption heavy metal hysteresis migration sorption |
| 收稿时间： | 25 March 2011 |
Retention and mobility of copper and lead in soils as influenced by soil horizon properties |
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| B. CERQUEIRA,E. F. COVELO,M. L. ANDRADE,F. A. VEGA.Retention and mobility of copper and lead in soils as influenced by soil horizon properties[J].Pedosphere,2011,21(5):603-614. |
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| Authors: | B CERQUEIRA E F COVELO M L ANDRADE and F A VEGA |
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| Institution: | Department of Plant Biology and Soil Science, University of Viga, 36310 Vigo (Spain);Department of Plant Biology and Soil Science, University of Viga, 36310 Vigo (Spain);Department of Plant Biology and Soil Science, University of Viga, 36310 Vigo (Spain);Department of Plant Biology and Soil Science, University of Viga, 36310 Vigo (Spain) |
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| Abstract: | The mobility and bioavailability of heavy metals in soils is largely governed by sorption and desorption phenomena. Cu2+ and Pb2+ are among the most potentially toxic heavy metals and they are present, often concomitantly, in many polluting spills and in agrochemicals. The objective was to assess and compare the competitive sorption and desorption capacities and sorption hysteresis of Cu2+ and Pb2+, as well as their migration through the profiles of four natural soils: a Humic Umbrisol, an Umbric Cambisol, an Endoleptic Luvisol and a Humic Cambisol. In all horizons Pb2+ was invariably sorbed and retained to a greater extent than Cu2+. The sorption and retention of Cu2+ were most influenced by pH, effective cation exchange capacity (CECe) and Mn oxides content. On the other hand, the fixation capacity of Pb2+ was most influenced by pH, CECe, and Mn oxide and organic matter contents. pH and CECe were the individual soil properties most markedly influencing Cu2+ and Pb2+ sorption and retention. In all the horizons Pb2+ exhibited greater hysteresis than Cu2+. In each soil the hysteresis in the A horizon was greater than that in the B horizon, except in the Bt horizon of Endoleptic Luvisol, due to its high pH and vermiculite content. Based on migration indices, Pb2+ was less mobile than Cu2+ in the studied soils. |
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| Keywords: | desorption heavy metal hysteresis migration sorption |
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