砜嘧磺隆25%可湿性粉剂在马铃薯中的残留动态

为了制定砜嘧磺隆在马铃薯生产中的安全使用标准,采用田间试验的方法,研究砜嘧磺隆在马铃薯中的残留动态,应用液相色谱法测定砜嘧磺隆在马铃薯中的残留量。试验结果表明:砜嘧磺隆在马铃薯植株和土壤中降解符合一级化学反应动力学方程C=C0e-kt,砜嘧磺隆在土壤中半衰期为(0.02～3.10 d),在植株中的半衰期为(0.93～2.90 d)。该药属易分解农药(T1/2<30 d)。在马铃薯4叶期时喷药1次,按推荐剂量90 g/hm2及1.5倍剂量135 g/hm2施用25%可湿性粉剂砜嘧磺隆。在收获期马铃薯植株和块茎均未检测出,在马铃薯上的砜嘧磺隆安全使用量推荐为90 g/hm2,建议马铃薯上砜嘧磺隆最大残留限量值MRL暂定为0.1 mg/kg。

Residue Dynamic of Rimsulfuron 25% WG in Potato

In order to draft a standard procedure for the safe use of Rimsulfuron on soil and potato,field trials were conducted to reveal dynamic of Rimsulfuron in soil and potato,respectively.The residue of Rimsulfuron in soil and potato was determined by HPLC procedure.The results indicated that degradation of Rimsulfuron in plant and soil samples was in accordance with the first-order kinetic equation C = C0e-kt.The half-lives of Rimsulfuron in soil and in plant were 0.02-3.10 and 0.93-2.90 days,respectively,suggesting that Rimsulfuron was a non-persistent herbicide(half-lives < 30 days).The potato was sprayed one time with 25% Rimsulfuron WG according to the recommended dosage 90 g / ha and high dosage 135 g / ha.The final residue of Rimsulfuron was not detected in potato plant and potato tuber.The recommended dosage for 25% Rimsulfuron WG is 90 g / ha.The maximum residue limit of Rimsulfuron in potato might be suggested to be 0.1mg/kg temporarily after two-year field trials in Jilin.