Autori: Walker, J.D., Enache, M., Dearden, J.C.

Editorial: QSAR Comb. Sci., 26 (4), p.522-527, 2007.

Rezumat:

Quantitative Cationic Activity Relationships (QCARs) were developed to predict the
toxicity of metal ions from physicochemical properties and natural occurrence levels. In
vivo toxicity data for different concentrations of nitrate salts of 17 metal ions were
developed based on germination of sunflower seeds (F.1. Helianthus annuus ASunspotB) in
distilled water. The EC50 data were reported as the concentration giving 50% inhibition
of radicle growth 1day after emergence. Stepwise regression of the toxicity data produced
correlations with some physicochemical properties and natural occurrence levels. For
physicochemical properties, good results were obtained with the density of the elements,
enthalpy of formation of metal sulphides and the stability constants of metal ions with
sulphate (r2
adj:¼0.720.81). For natural occurrence levels, good results were obtained with
metal concentrations in soil, the median elemental composition of soils and the calculated
mean of the elemental content in land plants (r2
adj:¼0.690.83).

Cuvinte cheie: Metal – toxicity relationships, Natural occurrence levels, Physicochemical properties