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论文类型：期刊论文

发表时间：2011-02-02

发表刊物：ENVIRONMENTAL POLLUTION

收录刊物：Scopus、SCIE、EI、PubMed

卷号：159

期号：2

页面范围：609-615

ISSN号：0269-7491

关键字：Bronopol; Transformation products; Hydrolysis; Photolysis; Toxicity

摘要：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.