Evaluation of monobasic calcium phosphate for the immobilization of heavy metals in contaminated soils from Lavrion

被引:98
作者
Theodoratos, P [1 ]
Papassiopi, N [1 ]
Xenidis, A [1 ]
机构
[1] Natl Tech Univ Athens, Met Lab, GR-15780 Zografos, Greece
关键词
contaminated soil; stabilization; lead; phytoaccumulation; phosphate;
D O I
10.1016/S0304-3894(02)00061-4
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The objective of this work was to evaluate the efficiency of monobasic calcium phosphate for the stabilization of heavy metals in contaminated soils. The treatment was applied on a soil sample from the Lavrion mining area, Greece, heavily contaminated with Pb, Zn, Cd and As and characterized as toxic in respect to Pb according to the US EPA toxicity characteristics leaching procedure (TCLP). The efficiency of stabilization was evaluated based on two criteria: (a) the reduction of metals mobility below the TCLP regulatory limits; (b) the reduction of phyto accumulation. Phytoaccumulation was evaluated both indirectly by applying leaching tests using EDTA, DTPA and NaHCO3 solutions and directly by carrying out pot experiments with Phaseolus vulgaris as plant indicator. This treatment was found to immobilize Pb and Cd, whereas As and Zn were slightly mobilized. No effect on phytoaccumulation was observed. Moreover, the treatment had a negative effect on plants growth, which was combined with a strong deficiency of Ca in the tissue of leaves. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:135 / 146
页数:12
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