溴氰虫酰胺在土壤中的环境行为特性

Characteristics of environmental behavior of cyantraniliprole in soil

[目的]采用室内模拟试验的方法,研究溴氰虫酰胺在土壤中的环境行为,为溴氰虫酰胺的安全评价提供参考。[方法]基于QuEChERS前处理方法结合LC-MS/MS测定土壤中的溴氰虫酰胺,探究溴氰虫酰胺的土壤表面光解特性、淋溶特性、吸附特性以及在土壤中的降解特性。[结果]溴氰虫酰胺在土壤表面光解半衰期为33.1 d,淋溶系数R_(2)+R_(3)+R_(4)>50。在3种不同特性土壤(黑土、红土、潮土)中以有机碳含量表示的土壤吸附系数(K_(oc))分别为966.5、412.1、135.8 mL/g,降解半衰期分别为29、445、12 d。[结论]溴氰虫酰胺在土壤表面难光解,在土壤中较难淋溶且吸附能力差,易在碱性土壤环境中降解,在酸性土壤中难降解,因此溴氰虫酰胺对土壤环境的风险较低。

[Aims]Laboratory simulation test was used to study the environmental behavior of cyantraniliprole in soil,and to provide reference for safety evaluation of it.[Methods]Based on the QuEChERS pretreatment method combined with LC-MS/MS,determination of cyantraniliprole residues in soil,the characteristics of photolysis,leaching,adsorption and degradation of cyantraniliprole on soil surface were explored.[Results]The photodegradation half-life of cyantraniliprole on the surface of soil was 33.1 d,and the leaching coefficients R_(2)+R_(3)+R_(4)>50.The soil adsorption coefficients(K_(oc))expressed by organic carbon content in three different types of soil(black soil,red soil and tidal soil)were 966.5,412.1 and 135.8 mL/g,respectively,and the degradation half-lifes were 29,445 and 12 d,respectively.[Conclusions]Cyantraniliprole is difficult to photodegrade on the surface of soil,and is difficult to be leaching and adsorbed in soil.It is easy to be degraded in alkaline soil environment,but difficult to be degraded in acidic soils.Therefore,cyantraniliprole poses a low risk to the soil environment.