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
Amanda Black, Ronald G McLaren, Suzanne M Reichman, Thomas W Speir, Leo M Condron
ENVIRONMENTAL POLLUTION | ELSEVIER SCI LTD | Published : 2011
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 (r² = 0.72) which also provided the best estimate of Zn bioavailability (r² = 0.64). DGT provided the best estimate of Cd bioavailability, accounting for 49% of shoot Cd concentrations. There was no reliable descriptor..View full abstract
The authors wish to acknowledge the financial contributions from the Institute of Environmental Science and Research Ltd. (ESR), through the Foundation of Research Science and Technology funding programme, and the Christchurch City Council; Nicholas Dickinson for reviewing of the manuscript; and technical assistance provided by Lynne Clucas, Roger Cresswell, Trevor Hendy, Neil Smith and Andrew Van Schaik.