Reduction of 2,4-dichlorophenol toxicity to Pseudomonas putida after oxidative incubation with humic substances and a biomimetic catalyst

Ecotoxicology and Environmental Safety
Dittmar HahnPiero M Armenante

Abstract

The effect of a synthetic iron(III)-porphyrin meso-tetra(2,6-dichloro-3-sulfonatophenyl)porphyrinate as a biomimetic catalyst in the oxidative treatment of 2,4-dichlorophenol (2,4-DCP) with humic substances and H(2)O(2) was evaluated in factorial design experiments conducted at different concentrations of 2,4-DCP (0-25 ppm) and different incubation treatment times (0, 24, 96, or 120 h). In the absence of this treatment, bioassays with the bacterium Pseudomonas putida (ATCC11250) showed decreasing specific growth rates mu (used here to quantify 2,4-DCP toxicity) with increasing concentrations of 2,4-DCP. However, when 2,4-DCP was treated as mentioned above the toxicity of the resulting 2,4-DCP solution was reduced significantly. At low 2,4-DCP concentrations (up to 5 ppm) and long incubation periods (as long as 120 h), the specific growth rate mu was comparable to that of cultures grown in the absence of 2,4-DCP. The reduction in toxicity was directly correlated to a decrease in the concentration of 2,4-DCP in the treated solutions, as measured by high-performance liquid chromatography. The reduced concentrations of 2,4-DCP in the treated solutions could be correctly predicted based on the relationship between the specific growt...Continue Reading

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Citations

Oct 5, 2011·Environmental Science and Pollution Research International·Barbara Fontaine, Alessandro Piccolo
Mar 25, 2014·Environmental Science and Pollution Research International·Barbara FontainePierluigi Mazzei
Jan 15, 2018·Environmental Science and Pollution Research International·Hao TianJian Wen Wang
Oct 12, 2010·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Bing L LeiZijian Wang

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