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Study on Biodegradation of Triazophos by Three Species of Freshwater Algae

YANG Ying-li~1,ZHU Xiao-yan~1,LI Ai-min~2,WANG Xue-dong~2,YANG Shao~11.College of Life Sciences,Central China Normal University,Wuhan 430079,China2.College of Chemistry,Central China Normal University,Wuhan 430079,China  
In order to evaluate the biodegradation of aquatic organophosphate pollutants by the algae,three species of freshwater algae,i.e.Chlamydomonas reinhardtii,Euglena gracilis and Synechococcus leopoliensis,were selected as the experiment material,and the biodegradation and bioaccumulation of triazophos by the algae were investigated.The results showed that the algae had the capability to degrade triazophos.At the initial concentration of 10(mg/L) triazophos, degradation radio of C.reinhardtii,E.gracilis,and S.leopoliensis in 8 days were 35.3%,44.6%,and 9.8% respectively.The algae could also accumulate significant amount of triazophos,transferring them to higher trophic levels and causing threat on the aquatic ecosystem and human health.Degradation kinetics of triazophos by E.gracilis fitted the first-order kinetics equation,and those of C.reinhardtii and S.leopoliensis fitted the second-order kinetics equation.
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