Pedosphere 21(5): 603--614, 2011
ISSN 1002-0160/CN 32-1315/P
©2011 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Retention and mobility of copper and lead in soils as influenced by soil horizon properties |
B. CERQUEIRA, E. F. COVELO, M. L. ANDRADE and F. A. VEGA |
| Department of Plant Biology and Soil Science, University of Vigo (Spain) |
| 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 oxide 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 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. |
| Key Words: desorption, heavy metal, hysteresis, migration, sorption |
| Citation: Cerqueira, B., Covelo, E. F., Andrade, M. L. and Vega, F. A. 2011. Retention and mobility of copper and lead in soils as influenced by soil horizon properties. Pedosphere. 21(5): 603-614. |
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