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Surface response model for prediction of the acute toxicity of Cu(II) and Cr(VI) towardDaphnia magna

Authors
Jo, H.-J.Jung, J.
Issue Date
2010
Keywords
Central composite design; Chemical speciation; Empirical model; Heavy metal; Mortality
Citation
Toxicology and Environmental Health Sciences, v.2, no.2, pp.141 - 147
Indexed
SCOPUS
Journal Title
Toxicology and Environmental Health Sciences
Volume
2
Number
2
Start Page
141
End Page
147
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/118317
DOI
10.1007/BF03216496
ISSN
2005-9752
Abstract
A central composite design (CCD) was employed to evaluate the combined effects of pH, hardness and dissolved organic carbon (DOC) on the toxicity of Cu (II) and Cr(VI) towardDaphnia magna. Surface response design (SRD) analysis showed that pH and DOC were found to be most significant for the Cu(II) toxicity (p<0.05), while pH and hardness for the Cr(VI) toxicity. According to the results of chemical speciation using the Visual MINTEQ program, increases in pH and DOC concentration led to decreased toxicity of Cu(II) by reducing the concentration of toxic Cu2+ species. For the Cr(VI) toxicity, increases in pH and hardness led to decreased toxicity towardD. magna by reducing the concentrations of toxic HCrO4- and CrO42- species. Based on the SRD analysis, surface response models were developed for prediction of the 24-h and 48-h mortalities ofD. magna in the presence of Cu(II) and Cr(VI) under different pH, hardness and DOC conditions. © 2010 The Korean Society of Environmental Risk Assessment and Health Science and Springer.
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