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Indexed by:期刊论文

Date of Publication:2011-02-02

Journal:ENVIRONMENTAL POLLUTION

Included Journals:Scopus、SCIE、EI、PubMed

Volume:159

Issue:2

Page Number:609-615

ISSN No.:0269-7491

Key Words:Bronopol; Transformation products; Hydrolysis; Photolysis; Toxicity

Abstract:Transformation products usually differ in environmental behaviors and toxicological properties from the parent contaminants, and probably cause potential risks to the environment. Toxicity evolution of a labile preservative, bronopol, upon primary aquatic degradation processes was investigated. Bronopol rapidly hydrolyzed in natural waters, and primarily produced more stable 2-bromo-2-nitroethanol (BNE) and bromonitromethane (BNM). Light enhanced degradation of the targeted compounds with water site specific photoactivity. The bond order analysis theoretically revealed that the reversible retroaldol reactions were primary degradation routes for bronopol and BNE. Judging from toxicity assays and the relative pesticide toxicity index, these degradation products (i.e., BNE and BNM), more persistent and higher toxic than the parent, probably accumulated in natural waters and resulted in higher or prolonging adverse impacts. Therefore, these transformation products should be included into the assessment of ecological risks of non-persistent and low toxic chemicals such as the preservative bronopol. (C) 2010 Elsevier Ltd. All rights reserved.