Journal
ENVIRONMENTAL POLLUTION
Volume 147, Issue 3, Pages 626-633Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2006.10.003
Keywords
bioavailability; metal speciation; plant; risk assessment
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A Biotic Ligand Model was developed predicting the effect of cobalt on root growth of barley (Hordeum vulgare) in nutrient solutions. The extent to which Ca2+, Mg2+, Na+, K+ ions and pH independently affect cobalt toxicity to barley was studied. With increasing activities of Mg2+, and to a lesser extent also K+, the 4-d EC50(Co2+) increased linearly, while Ca2+, Na+ and H+ activities did not affect Co2+ toxicity. Stability constants for the binding of Co2+, Mg2+ and K+ to the biotic ligand were obtained: log K-CoBL = 5.14, log K-MgBL = 3.86 and log K-KBL = 2.50. Limited validation of the model with one standard artificial soil and one standard field soil showed that the 4-d EC50(Co2+) could only be predicted within a factor of four from the observed values, indicating further refinement of the BLM is needed. (c) 2006 Elsevier Ltd. All rights reserved.
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