title: Development and validation of a terrestrial biotic ligand model for Ni toxicity to barley root elongation for non-calcareous soils.
abstract: A Terrestrial Biotic Ligand Model (TBLM) for Ni toxicity to barley root elongation (RE) developed from experiments conducted in sand culture was used to predict toxicity in non-calcareous soils. Ca(2+) and Mg(2+) concentrations and pH in sand solution were varied individually and TBLM parameters were computed. EC50 increased as Mg(2+) increased, whereas the effect of Ca(2+) was insignificant. TBLM parameters developed from sand culture were validated by toxicity tests in eight Ni-amended, non-calcareous soils. Additional to Ni(2+) toxicity, toxicity from all solution ions was modelled independently as an osmotic effect and needed to be included for soil culture results. The EC50s and EC10s in soil culture were predicted within twofold of measured results. These are close to the results obtained using parameters estimated from the soil culture data itself.
authors: Center for the Study of Metals in the Environment, Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, USA.
authors: Yanqing
authors: Y
authors: Lin
authors: Center for the Study of Metals in the Environment, Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, USA.
authors: Dominic M
authors: DM
authors: Di Toro
authors: Center for the Study of Metals in the Environment, Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, USA. Electronic address: allen@udel.edu.
authors: Herbert E
authors: HE
authors: Allen
mesh_terms: D002118:Calcium / Q000032:analysis; D001467:Hordeum / Q000187:drug effects* / Q000254:growth & development; D006863:Hydrogen-Ion Concentration; D008024:Ligands; D008274:Magnesium / Q000032:analysis; D008954:Models, Biological; D009532:Nickel / Q000633:toxicity*; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000633:toxicity*
chemical_list: D008024:Ligands; D012987:Soil; D012989:Soil Pollutants; D009532:Nickel; D008274:Magnesium; D002118:Calcium
keywords: Barley; Osmotic effect; Root elongation; Sand culture; Soil; Terrestrial biotic ligand model