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Modelling of the Joint Toxicity of Heavy Metals (Ni2+, Co2+, Cr3+ and Pb2+) on Photobacteria Based on the Factorial Experiment (24)


Affiliations
1 Resource and Environment Institute of North China Electric Power University, Beijing 102206, China
 

The joint toxicity of heavy metals (Ni2+, Co2+, Cr3+, Pb2+) and trends in toxicity were analysed by multiple linear regression and back propagation-artificial neural network models, using photobacteria as an indication organism in factorial experiments. The joint toxicity of Ni2+, Co2+, Cr3+ and Pb2+ mainly occurs through multiple interactions. Interactions between Ni2+, Co2+ and Cr3+ weaken the single toxicity and binary interaction of Pb2+. Binary or quaternary heavy metal mixtures exert mainly antagonistic effects, while ternary interactions are mainly synergistic. Increased concentrations of Pb2+, Cr3+ and Ni2+ corresponded with increased toxicity of the mixed system, but Co2+ showed the opposite trend. The toxic effects of the mixed system were greatest with high Cr3+ concentration, while Pb2+ exerted the smallest effect.

Keywords

Heavy Metal, Joint Toxicity, Factorial Experiment, Multiple Linear Regression, BP-ANN.
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  • Modelling of the Joint Toxicity of Heavy Metals (Ni2+, Co2+, Cr3+ and Pb2+) on Photobacteria Based on the Factorial Experiment (24)

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Authors

Meiling Xin
Resource and Environment Institute of North China Electric Power University, Beijing 102206, China
Lan Wang
Resource and Environment Institute of North China Electric Power University, Beijing 102206, China
Yu Li
Resource and Environment Institute of North China Electric Power University, Beijing 102206, China

Abstract


The joint toxicity of heavy metals (Ni2+, Co2+, Cr3+, Pb2+) and trends in toxicity were analysed by multiple linear regression and back propagation-artificial neural network models, using photobacteria as an indication organism in factorial experiments. The joint toxicity of Ni2+, Co2+, Cr3+ and Pb2+ mainly occurs through multiple interactions. Interactions between Ni2+, Co2+ and Cr3+ weaken the single toxicity and binary interaction of Pb2+. Binary or quaternary heavy metal mixtures exert mainly antagonistic effects, while ternary interactions are mainly synergistic. Increased concentrations of Pb2+, Cr3+ and Ni2+ corresponded with increased toxicity of the mixed system, but Co2+ showed the opposite trend. The toxic effects of the mixed system were greatest with high Cr3+ concentration, while Pb2+ exerted the smallest effect.

Keywords


Heavy Metal, Joint Toxicity, Factorial Experiment, Multiple Linear Regression, BP-ANN.

References