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Predicting effects of cations on copper toxicity to lettuce (Lactuca sativa) by the biotic ligand model

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Predicting effects of cations on copper toxicity to lettuce (Lactuca sativa) by the biotic ligand model

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Le, T. T. Yen Peijnenburg, Willie J. G. M. Hendriks, A. Jan Vijver, Martina G.
Description	Country affiliation: Netherlands Author Affiliation: Le TT ( Department of Environmental Sciences, Radboud University Nijmegen, Nijmegen, The Netherlands.)
Abstract	A biotic ligand model (BLM) was developed to estimate Cu toxicity to lettuce (Lactuca sativa) in terms of root elongation after 4 d of exposure. Effects of $Na^{+},$ $K^{+},$ $Ca^{2+},$ and $Mg^{2+}$ on Cu toxicity were examined. The addition of these cations resulted in a 50-fold difference in the copper median effective activity (). However, these variations could not be interpreted entirely as a function of the concentrations of these cations alone. In particular, only the relationship between and the activity of protons was found to be significant in the whole range of pH examined from 5.0 to 7.0. The addition of $K^{+},$ $Na^{+},$ $Ca^{2+},$ and $Mg^{2+}$ at concentrations up to 20 mM resulted in a 16-fold difference in values. This difference was significant, as indicated by non-overlapping standard deviations of the negative logarithm of () obtained with (7.37 ± 0.22) and without (6.76 ± 0.22) additions of $K^{+},$ $Na^{+},$ $Ca^{2+},$ and $Mg^{2+}.$ The variations were not statistically significantly related to concentrations of these cations; therefore, only protons can be integrated in the BLM predicting Cu toxicity to lettuce L. sativa with the important parameters: log $K_{HBL }= 6.27,$ log $K_{CuBL }= 7.40,$ and = 0.36 at pH = 7. The lack of significant relationships between and concentrations of the cations was not in line with the main assumption of the BLM about the competition between cations for binding sites. Environ. Toxicol. Chem. 2012;31:355–359. © 2011 SETAC
File Format	HTM / HTML
ISSN	07307268
Issue Number	2
Volume Number	31
e-ISSN	15528618
Journal	Environmental Toxicology and Chemistry
Language	English
Publisher	Wiley
Publisher Date	2012-02-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soil Pollutants Research Support, Non-u.s. Gov't Models, Chemical Calcium Toxicity Discipline Environmental Health Discipline Toxicology Metabolism Drug Effects Journal Article Growth & Development Lettuce Chemistry Plant Roots Sodium Models, Biological Discipline Chemistry Ligands Cations Magnesium Copper Binding Sites Potassium
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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