Degradation of rizazole in water–sediment systems |
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| Authors: | Changpeng Zhang Hua Zhao Lifeng Ping Xiaoming Cai Min Wu Hongmei He |
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| Institution: | State Key Lab Breeding Base for Zhejiang Sustainable Plant Pest Control and MOA Key Lab for Pesticide Residue Detection, Institute of Quality and Standard for Agro-products, Zhejiang Academy of Agricultural Sciences , Hangzhou , China |
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| Abstract: | This study investigated the degradation of rizazole in water-sediment systems (West Lake system, WL; Beijing–Hangzhou Grand Canal system, BG) with two different types of sediments under aerobic and anaerobic conditions. The half-lives of rizazole in the WL water phase (14.59–15.13 d) were similar to those in the BG water phase (15.90–16.46 d). Within 3–7 d, the rizazole concentration in the sediments reached the maximum values, i.e., equilibrium. Rizazole dissipation was faster in the WL sediment phase with higher organic matter content (T1/2 = 18.99–19.09 d) compared with the BG sediment phase (T1/2 = 31.08–33.32 d). Rizazole degradation was slightly faster in the West Lake water-sediment system (WL system) (T1/2 = 17.11–18.05 d) than in the Beijing–Hangzhou Grand Canal water—sediment system (BG system) (T1/2 = 20.51–25.02 d). The aerobic degradation of rizazole was similar to its anaerobic degradation in the water-sediment system. The findings are useful to understand the behavior of pesticide in environment. |
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| Keywords: | Aerobic conditions anaerobic conditions half-life West Lake system Beijing-Hangzhou Grand Canal system N-substituted phenyl pyrazole insecticide |
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