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Abstract
Six wetland plants were investigated for their effect on the degradation characteristics of chlorpyrifos in nonsterile hydroponic system at constant temperature of 28°C. The results showed that the removal rates of chlorpyrifos in the water of plant systems were 1.26–5.56% higher than that in the control without plants. Scirpus validus and Typha angustifolia were better than other hygrophytes in elimination of chlorpyrifos. The removal rates of the two systems were up to 88%. Plants of acaulescent group had an advantage over caulescent group in removing chlorpyrifos. Phytoaccumulation of chlorpyrifos was observed, and the order of chlorpyrifos concentration in different plant tissues was root > stem > leaf. It was also found that chlorpyrifos and its metabolite TCP decreased rapidly at the initial step of the experiment.
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ACKNOWLEDGMENTS
Financial support was provided by National Nature Science Foundation of China (No.50909091), Major Science and Technology Program for Water Pollution Control and Treatment of China 11th Five-Year Plan (No.2009ZX07209-004-4), the Knowledge Innovation Program of the Chinese Academy of Sciences (No.Y05E04) and “Chen Guang” Project of Wuhan (No. 201050231028). The authors thank Profs. Yongyuan Zhang, Baoyuan Liu, Drs. Wei Liang, and Biyun Liu for the experimental design and paper preparation, as well as other laboratory colleagues for assistance during the work.