Residue analysis and dissipation of monosulfuron in soil and wheat

Abstract： HPLC-UV residue analytical method for monosulfuron [N-[(4'-methyl) pyrimidin-2'-yl]-2-nitrophenylsulfonyl urea] in soil and wheat was developed. Monosulfuron residues were recovered by solvent extraction, followed by liquid-liquid partition, and C18 column clean-up. Excellent method recoveries ranging from 95%-104% for both fortified soil and wheat grain were obtained with coefficients of variation 1.5%-11.8%. The minimum detectable quantities in soil and wheat were both 4 ng, the limit of detection was 0.02 mg/kg. When monosulfuron was applied according to double dosage of maximum recommended use direction(120 g ai/hm2 of 10% monosulfuron wettable powder sprayed for once during development of wheat) in field studies conducted in Shandong Province and near Beijing, monosulfuron residues was not detected in soil and wheat samples collected 75 d after application. Laboratory soil degradation studies showed that monosulfuron degraded faster in acidic soil and strong alkaline soil than in neutral or weak alkaline soil. Half lives in Jiangxi soil, Shijiazhuang soil, Jiangsu soil and Heilongjiang soil were 41, 48, 87 and 84 d respectively. Monosulfuron residues dissipated rapidly in Shandong and Beijing field test sites with half-lives of less than 14 d. 作 者： FAN Zhi-Jin    HU Ji-Ye    AI Ying-Wei    QIAN Chuan-Fan    YU Wei-qiang    LI Zheng-ming   作者單位： FAN Zhi-Jin,YU Wei-qiang,LI Zheng-ming(National Key Laboratory of Elemento-Organic Chemistry,Nankai University,Tianjin 300071,China)

HU Ji-Ye,QIAN Chuan-Fan(College of Science,China Agricultural University,Key Laboratory of Pesticide Chemistry & Application Technology of Ministry of Agriculture,Beijing 100094,China)

AI Ying-Wei(College of Life Science,Sichuan University,Chengdu 610065,China) 

期 刊： 環(huán)境科學(xué)學(xué)報(bào)（英文版）  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(5)  分類號： X131  Keywords： monosulfuron    wheat (Triticum,aestivum L.)    soil degradation    residue analysis