农药学学报2017，Vol.19Issue(1)：61-67,7.DOI:10.16801/j.issn.1008-7303.2017.0009
五氟磺草胺在稻田中的消解动态及残留特性
Dissipation and residue characteristic of penoxsulam in rice paddy
李文卓 1钱圆 1MATSUMOTO Haruna 1杨斌 1王蒙岑 1朱国念1
作者信息
- 1. 浙江大学农药与环境毒理研究所,杭州 310029
- 折叠
摘要
Abstract
A qualitative and quantitative method using UPLC-MS/MS was developed for the analysis of penoxsulam residues in rice paddy samples including rice plant, paddy water, soil and brown rice. The residue and dissipation of penoxsulam in the rice paddy were investigated for dietary risk assessment of residual penoxsulam in brown rice. Based on the analytical approach, the satisfied linearity was obtained in the concentration ranged from 0.005 mg/L to 0.5 mg/L with the limit of detection( LOD) from 0.001 mg/kg to 0.002 mg/kg and the limit of quantification( LOQ) from 0.003 mg/kg to 0.005 mg/kg. With the spiked concentrations of 0.005 to 0.5 mg/kg, the average recoveries varied from 89% to 106% with the relative standard deviation (RSD) from 2.8% to 8.5%. Those results indicated that this new method has favorable accuracy, precision and sensitivity, which meets the demand of pesticide residue analysis and is applicable for effective monitoring the penoxsulam residual in rice paddy field. The results of residue dynamics indicated that the half-lives of penoxsulam in rice plant, paddy soil and water were 1.5-3.3 d, 3.0-4.7 d, and 1.6-3.0 d, respectively. Hence, penoxsulam belongs to a class of readily-degradable herbicide in the rice paddy environment. After the application of 0.025% penoxsulam granules twice with the dosage at 37.5 g a.i./hm2 and 56.3 g a.i./hm2, respectively, the highest residues of penoxsulam in brown rice were lower than 0.005 mg/kg and the dietary risk was low in which the risk quotient was 2.22×10-4, which was obviously lower than risk threshold. Taken together, our data can be used as an important methodological and statistical basis for the further integrated evaluation of dietary risk and MRL formulation.关键词
五氟磺草胺/稻田/残留/消解/超高效液相色谱-质谱联用/膳食风险评估Key words
penoxsulam/rice paddy/residue/dissipation/ultra high performance liquid chromatography-mass spectrometry(UPLC-MS/MS)/dietary risk assessment分类
农业科技引用本文复制引用
李文卓,钱圆,MATSUMOTO Haruna,杨斌,王蒙岑,朱国念..五氟磺草胺在稻田中的消解动态及残留特性[J].农药学学报,2017,19(1):61-67,7.
