Predicting reductive debromination of polybrominated diphenyl ethers by nanoscale zerovalent iron and its implications for environmental risk assessment.
Sci Total Environ
; 470-471: 1553-7, 2014 Feb 01.
Article
em En
| MEDLINE
| ID: mdl-23928371
ABSTRACT
The reductive debromination of polybrominated diphenyl ethers (PBDEs) by nanoscale zerovalent iron (nZVI) has proven to be a successful remediation approach. This study simulates the congener profiles and overall ecotoxicological impact of PBDE debromination by nZVI. The relationship between the calculated redox potential values and PBDE debromination rates was sufficiently strong to generate a satisfactory predictive capacity, which was further used to develop a quantitative structure-activity relationship (QSAR) model for the determination of the PBDE debromination patterns and dominant pathways. The predicted results of deca-BDE debromination showed that it would completely disappear within 30 days, but its lower brominated products, particularly tri- to penta-homologues, could exist in the environment even after 5 years. Formation and accumulation of more toxic, low brominated congeners through deca-BDE debromination suggest that deca-BDE may pose prolonged environmental risks. Changes in the toxic equivalent (TEQ) values during deca-BDE debromination parallel the occurrence and transformation of specific low brominated congeners with dioxin-like potency.
Palavras-chave
Texto completo:
1
Temas:
ECOS
/
Aspectos_gerais
Bases de dados:
MEDLINE
Assunto principal:
Poluentes Ambientais
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Nanopartículas Metálicas
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Éteres Difenil Halogenados
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Retardadores de Chama
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Ferro
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Modelos Químicos
Tipo de estudo:
Etiology_studies
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Prognostic_studies
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Risk_factors_studies
Idioma:
En
Revista:
Sci Total Environ
Ano de publicação:
2014
Tipo de documento:
Article