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Ecotoxicity of Ni in soil

Center for the Study of Metals in the Environment, Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716 USA

^* E-mail: allen{at}udel.edu

ABSTRACT

Assessing metal contamination of soils has been a difficult task because the metal concentration in soil is not directly correlated to its potential effects. We review an approach, termed the Terrestrial Biotic Ligand Model (TBLM), in which partitioning of metal from soil to soil solution is modelled and the metal in solution interacts with an organism, the biotic ligand, to cause toxicity. The toxicity is modulated by other cations in the soil solution, principally H⁺, Ca²⁺, and Mg²⁺. New results for the model using Ni as the toxic species and barley root elongation as the biological response are presented.

KEYWORDS: soil, toxicity, Terrestrial Biotic Ligand Model, Ni, barley root elongation