Effects of cement or lime on Cd, Co, Cu, Ni, Pb, Sb and Zn mobility in field-contaminated and aged soils

被引:132
作者
Hale, Beverley [1 ]
Evans, L. [1 ]
Lambert, R. [1 ]
机构
[1] Univ Guelph, Sch Environm Sci, Guelph, ON N1G 2W1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Soil; Trace elements; Cement; Lime; Mobility; ORGANIC-MATTER; HEAVY-METALS; LEACHING BEHAVIOR; CADMIUM SORPTION; TRACE-METALS; SANDY SOIL; WASTE; PH; ANTIMONY; ASH;
D O I
10.1016/j.jhazmat.2011.10.065
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Cement or lime can be used to treat trace element contaminated soils, reducing their mobility due to increased soil pH which enhances precipitation and adsorption, and also due to pozzolanic reactions and cementation. In the present work, an alkaline and an acidic soil both containing Cd, Co, Cu, Ni, Pb, Sb and Zn from either geogenic or geogenic and anthropogenic origin were treated with cement or calcium hydroxide. Soils were then extracted with dilute HNO3 or NaOH solution of different concentrations to obtain extracts of different pH (pH 4-12). In untreated soils, Co, Cu, Ni and Pb in solutions were detected at alkaline pH. The addition of cement or Ca(OH)(2) reduced the mobility of every trace element at high pH, but enhanced the mobility of Cd, Co, Cu, Ni, Pb and Zn at low pH. Metal mobilisation at high pH was observed for Cu in the acidic soil due to the liberation of dissolved organic matter. Below pH 6, Sb mobility was lower in the cement-treated soil compared to the untreated soil, but the same in the Ca(OH)(2) treated soil as in the control soil. Comparison with theoretical trace element precipitates suggested that the mobility of trace elements is likely reduced at high pH by encapsulation and immobilisation within the cement matrix rather then precipitation. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:119 / 127
页数:9
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