【摘要】 ¹⁴C-绿黄隆的土壤降解研究表明:¹⁴C-绿黄隆在室外自然条件旱地土壤中,随时间延长,其可提取态残留逐渐降低,结合残留逐渐增加,而消失较为缓慢,（175 d时可提取态占51.43％,结合态为25.19％,消失为12.50％;300 d时分别为26.22％、31.45％和29.59％;470d时分别为16.05％、39.40％和30.59％）。按可提取态放射性残留,其降解动态方程为Y=109.599 e^-0.00436X,r=-0.9826,残留半衰期为179.9d,基于绿黄隆具有随水迁移性,和其降解物转为结合态后迁移性减弱的特点,其残留物主要分布在上层,一部分随水下移而被淋脱,其中175 d的淋脱量约占11％,300 d约为13％,470 d约为14％;¹⁴C-绿黄隆在三种不同土壤以旱地条件室内暗培养,其残留动态与室外条件下的基本一致,¹⁴C-绿黄隆在三种土壤中,因其pH值不同其降解半衰期也不同,酸性的红壤中残留半衰期为149d,在性的黄棕壤中为165 d,碱性黄潮土中为252 d;¹⁴C-绿黄隆在土壤中残留物TLC分离及其层析谱放射性活度检测结果,按Rf值其放射性降解产物主要为三氮苯胺类结构物,并随时间延长其量明显增加,不同土壤间残留物组成比因降解速度不同而不同。更多还原

【Abstract】 The study on the dynamics of degradation of the 14C-chlorsulfuron shows that extractable residua of chlorsulfuron in dryland soil under outdoor condition is reduced with the extention of time, the bond residua is increased gradually but its dying out is slow. For example, on the 175 th day, extractable residua is 51. 43% of primitive dose, bond residua 25. 19% and dying out 12. 50%; on the 300 th day, the residua are 26.22%, 31.45% and 29.59% respectively; and 16.05%, 39. 40% and 30. 59% on the 470 th day. According to the extractable residua, the degradation equation of chlorsulfuron is Y=109. 599e -0.00436X, r= - 0. 9826 and half life is 179. 9 d. Because chlorsulfuron migrates with water and the migration of its degradation products become weak, the residua of 14 C-chlorsulfuron stay mainly on the upper layer soil and a part of them may leach down with water. The dynamics of degradation indoor in three dry land soils are similar to that of outdoor. The half life degradation of 14C-chlorsulfuron is different with soils acidity, in acid red earth T1/2 is 149 d, in medium yellow-brown earth 165 d and in alkaline yellow flovo-aquic soil 252 d. Because the methods of TLC and radioactive assay are taken to separate the remains of 14C-chlorsulfuron in soil, the radioactive degradation products belong to trinitrogen-aniline. The dose of remain products increase remarkably with the extention of time, the composition of the remain products is different because of the different velocities of degradation of chlorsulfuron in three soils.更多还原