Evaluation of soil metal bioavailability estimates using two plant species (L. perenne and T. aestivum) grown in a range of agricultural soils treated with biosolids and metal salts

被引:43
作者
Black, Amanda [1 ]
McLaren, Ronald G. [1 ]
Reichman, Suzanne M. [2 ]
Speir, Thomas W. [3 ]
Condron, Leo M. [1 ]
机构
[1] Lincoln Univ, Fac Agr & Life Sci, Dept Soil & Phys Sci, Christchurch 7647, New Zealand
[2] RMIT Univ, Sch Civil Environm & Chem Engn, Melbourne, Vic 3001, Australia
[3] Inst Environm Sci & Res Ltd ESR, Porirua 5240, New Zealand
关键词
Metals; Bioavailability; Soils; Biosolids; CONTAMINATED SOILS; DIFFUSIVE GRADIENTS; THIN-FILMS; COPPER AVAILABILITY; EXTRACTABLE COPPER; TRACE-METALS; ION-BINDING; CADMIUM; ZINC; DGT;
D O I
10.1016/j.envpol.2011.03.004
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Few studies have quantified the accuracy of soil metal bioavailability assays using large datasets. A meta-analysis from experiments spanning 6 months to 13 years on 12 soil types, compared bioavailability estimate efficiencies for wheat and ryegrass. Treatments included biosolids +/- metals, comparing total metal, Ca(NO3)(2), EDTA, soil solution, DGT and free ion activity. The best correlations between soil metal bioavailability and shoot concentrations were for Ni using Ca(NO3)(2) (r(2) = 0.72) which also provided the best estimate of Zn bioavailability (r(2) = 0.64). DGT provided the best estimate of Cd bioavailability, accounting for 49% of shoot Cd concentrations. There was no reliable descriptor of Cu bioavailability, with less than 35% of shoot Cu concentrations defined. Thus interpretation of data obtained from many soil metal bioavailability assays is unreliable and probably flawed, and there is little justification to look beyond Ca(NO3)(2) for Ni and Zn, and DGT for Cd. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1523 / 1535
页数:13
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