戊唑醇在环境中的降解迁移和生物富集性研究

发布时间：2018-07-11 21:35

本文选题：戊唑醇 + 降解　；参考：《生态毒理学报》2017年04期

【摘要】：戊唑醇属于内吸性三唑类杀菌农药,在国内广泛用于田间病虫防治,故其在环境中的归趋备受关注。采用室内模拟试验方法,研究了戊唑醇在水-沉积物中的降解特性、土壤中的吸附性和在斑马鱼中的生物富集性。结果表明:好氧条件下,戊唑醇在河流与湖泊水-沉积物系统中农药总量的降解半衰期分别为533.2、433.2 d;厌氧条件下,河流与湖泊水-沉积物系统中降解半衰期分别为364.8、1 732.9 d;沉积物系统降解半衰期较长,降解速率主要受水中戊唑醇的降解速率影响。戊唑醇在江西红壤、太湖水稻土、常熟乌杉土、东北黑土中的吸附性符合Freundlich方程,Kd值分别为7.4、11.8、11.2和15;吸附性大小次序为东北黑土太湖水稻土常熟乌杉土江西红壤;以有机碳含量表示的土壤吸附常数KOC在698.9~1 635.5之间;影响戊唑醇土壤吸附性的主要因素为土壤有机质含量和p H。戊唑醇在斑马鱼中的生物富集系数BCF8 d为21.52~25.30,具有中等富集性。戊唑醇在水体环境中具有较强稳定性,不易被土壤吸附,且具有一定的生物富集性,可能会对水体和水体生物造成一定的污染。
[Abstract]:Tebuconazole is an endo-triazole fungicidal pesticide, which is widely used in field pest control in China, so its fate in the environment has attracted much attention. The degradation characteristics of tebuconazole in water-sediment, adsorption in soil and bioconcentration in zebrafish were studied in laboratory. The results showed that the degradation half-life of tebuconazole in river and lake water-sediment system was 533.2433.2 days under aerobic condition. The degradation half-life in river and lake water-sediment system was 364.8m 1 732.9 d, and the degradation rate was mainly influenced by the degradation rate of tebuconazole in water. The adsorption of tebuconazole in red soil of Jiangxi, paddy soil of Taihu Lake, Changshu Ureus soil and black soil of Northeast China were in accordance with Freundlich equation and K d values were 7.4% 11.811.2 and 15, respectively, and the order of adsorption was red soil of Jiangxi. The soil adsorption constant (KOC) expressed by organic carbon content was between 698.9 and 1 635.5, and the main factors affecting the sorption of tebuconazole were soil organic matter content and pH. The bioenrichment coefficient (BCF8 d) of tebuconazole in zebrafish was 21.52 ~ 25.30, which showed moderate enrichment. Tebuconazole has strong stability in water environment, is not easy to be adsorbed by soil, and has certain bioaccumulation, which may cause certain pollution to water body and water organism.
【作者单位】：环境保护部南京环境科学研究所国家环境保护农药环境评价与污染控制重点实验室;南京国环科技股份有限公司;
【基金】：国家重点研发计划(化学农药在我国不同种植体系的归趋特征与限量标准,2016YFD0200200,氰氟草酯在作物和土壤中的迁移与转化,2016YFD0200201)
【分类号】：X592

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