Toxicity of metal-ethylenediaminetetraacetic acid solution as a function of chemical speciation:An approach for toxicity assessment
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Tipus de documentArticle
Data publicació2012-08-05
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Abstract
The influence of complexation by ethylenediaminetetraacetic
acid (EDTA) on the toxicity of Cd(II),
Cu(II), Cd(II), and Ni(II) was investigated. Result of the
Microtox test, which is based on measuring the decrease of
light emitted by Vibrio fischeri bacterium when exposed to a
toxicant, was used as an indication of toxicity. The effect of
pH and EDTA molar ratio that might potentially modify the
percentage of chemical species in solution on toxicity was
evaluated. In general, results indicate that toxicity decreases
when increasing the pH value as well as the EDTA molar
ratio. Chemical modeling was used to predict metal speciation
and correlation analysis to relate chemical species with
the obtained toxicity results. The species that most contribute
to toxicity resulted to be MeCl? (Me = metal), which is
formed as a consequence of the presence of the bioassay
medium (2 % NaCl). A model that predicts metal-solution
toxicity by using the chemical species, whichmost contribute
to toxicity is proposed as a useful tool for toxicity assessment
in waters containing metal ions and EDTA.
CitacióPeraferrer, C. [et al.]. Toxicity of metal-ethylenediaminetetraacetic acid solution as a function of chemical speciation:An approach for toxicity assessment. "Archives of environmental contamination and toxicology", 05 Agost 2012, vol. 63, núm. 4, p. 484-494.
ISSN0090-4341
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