Dataset Information

Complete mineralization of perfluorooctanoic acid (PFOA) by ?-irradiation in aqueous solution.

ABSTRACT: Decomposition of perfluorooctanoic acid (C7F15COOH, PFOA) has been gaining increasing interests because it is a ubiquitous environmental contaminant and resistant to the most conventional treatment processes. In this work, the rapid and complete mineralization of PFOA and simultaneous defluorination were achieved by ?-ray irradiation with a (60)Co source. The degradation rate of PFOA by ?-ray irradiation would be high, and a pseudo-first-order kinetic rate constant of 0.67 h(-1) could be achieved in the N2 satured condition at pH 13.0. The experimental results and quantum chemical calculation confirmed that two radicals, i.e., hydroxyl radical (·OH) and aqueous electrons (eaq(-)), were responsible for the degradation of PFOA, while only either eaq(-) or ·OH might not be able to accomplish complete mineralization of PFOA. The synergistic effects of ·OH and eaq(-) involved in the cleavage of C-C and C-F bonds, and therefore complete mineralization of PFOA were achieved. The intermediate products were identified and the degradation pathway was also proposed. The results of this study may offer a useful, high-efficient approach for complete mineralizing fluorochemicals and other persistent pollutants.

SUBMITTER: Zhang Z

PROVIDER: S-EPMC4261166 | biostudies-literature | 2014 Dec

REPOSITORIES: biostudies-literature

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Complete mineralization of perfluorooctanoic acid (PFOA) by γ-irradiation in aqueous solution.

Zhang Ze Z Chen Jie-Jie JJ Lyu Xian-Jin XJ Yin Hao H Sheng Guo-Ping GP

Scientific reports 20141210

Decomposition of perfluorooctanoic acid (C7F15COOH, PFOA) has been gaining increasing interests because it is a ubiquitous environmental contaminant and resistant to the most conventional treatment processes. In this work, the rapid and complete mineralization of PFOA and simultaneous defluorination were achieved by γ-ray irradiation with a (60)Co source. The degradation rate of PFOA by γ-ray irradiation would be high, and a pseudo-first-order kinetic rate constant of 0.67 h(-1) could be achieve ...[more]

PMID: 25492109

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Project description:Perfluorooctanoic acid (PFOA) is one of the most used perfluorinated compounds in numerous applications and can be detected in environmental samples from around the globe. The aquatic environment is an important site for PFOA deposit. Nevertheless, the exact mode of action and its resulting toxicological effects on aquatic organisms remain largely unknown. To gain a more extensive understanding of the mode of action of teleost PFOA toxicity, transcriptomics, proteomics, biochemical parameters and reproduction were integrated in the present study. Male and female zebrafish were exposed to nominal concentrations of 0.1; 0.5 and 1 mg/l PFOA for 4 and 28 days resulting in an accumulation which was higher in males compared to females. These gender-related differences were likely caused by different elimination rates due to distinct hormone levels and differences in transport activity by solute carriers. The general mode of action of PFOA was believed to be an increase of the mitochondrial membrane permeability which caused effects on the electron transport system at the biochemical level and resulted in alterations of the oxidative phosphorylation, oxidative stress and apoptosis at the gene transcript and protein level. As a consequence, evidence for the replacement of the affected cells and organelles to sustain tissue homeostasis was found at the molecular level. The higher energy demand, due to these adverse effects, was provided by lowering the glycogen stores. Despite this increase in metabolic expenditure, no effects on reproduction were found indicating that the fish seemed to cope with exposure to the tested concentrations of PFOA. Adult zebrafish (Danio rerio) were exposed to nominal concentrations of 0mg/l; 0.1mg/l; 1mg/l PFOA (perfluorooctanoic acid) for 28 days. Three different 25 litre aquaria per exposure concentration were used resulting in 3 biological replicates with each aquarium containing 8 male and 8 female zebrafish. The livers of 6 male fish and 6 female fish were pooled separately and snap frozen in liquid nitrogen. A reference sample was made by pooling equal amounts of RNA from all samples. A carriage wheel design was used in which all samples were connected to the reference sample and the main contrasts of interest were made directly on the same microarrays as frequently as possible. This design resulted in technical triplicates of each sample.

Dataset Information

Complete mineralization of perfluorooctanoic acid (PFOA) by ?-irradiation in aqueous solution.

Publications

Complete mineralization of perfluorooctanoic acid (PFOA) by γ-irradiation in aqueous solution.

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