期刊
WATER RESEARCH
卷 43, 期 6, 页码 1731-1739出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2009.01.004
关键词
Triazine herbicides; Vibrio qinghaiensis sp.-Q67; Long-term toxicity; Short-term toxicity; Time-dependent toxicity
资金
- National High Technology Research and Development Program of China [2007AA06Z417]
- National Natural Science Foundation of China [20577023, 20777056]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [200355]
The bioluminescence inhibition of six triazine herbicides including desmetryne (DES), simetryn (SIM), velpar (VEL), prometon (PRO), metribuzin (MET), and aminotriazine (AMI) on Vibrio qinghaiensis sp.-Q67 (Q67) was determined to investigate the effects of exposure duration on the ecotoxicological relevance of triazine herbicides. Based on the short-term microplate toxicity analysis (MTA), a long-term MTA was established to assess the impact of exposure time on the toxicities of the herbicides. The results show that the long-term toxicities of DES and SIM are similar to their short-term toxicities, and the long-term toxicities of VEL, PRO, and MET are higher than their short-term toxicities, while AMI without short-term toxicity has a high long-term toxicity. In addition, a parabolic relationship was found between the pEC(50) (the negative logarithm of the EC50, log 1/EC50) and the logarithm of octanol-water partition coefficient (logK(ow)). To better understand their toxicity process, the time-dependent toxicities of the six herbicides on Q67 were determined over a period of 12 h during which measurements were taken every 30 min to generate an integral effect surface related to both concentration and duration. (C) 2009 Elsevier Ltd. All rights reserved.
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