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两种除草剂在燕麦田土壤中的残留与消解动态
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  • 英文篇名:Residues and degradation dynamics of two herbicides in oat field soil
  • 作者:闫车太 ; 赵桂琴 ; 柴继宽 ; 苟智强 ; 许兴泽
  • 英文作者:YAN Chetai;ZHAO Guiqin;CHAI Jikuan;GOU Zhiqiang;XU Xingze;College of Pratacultural Science, Gansu Agricultural University;Key Laboratory of Grassland Ecosystem, Ministry of Education;Pratacultural Engineering Laboratory of Gansu Province;Sino–U.S.Centers for Grazing land Ecosystem Sustainability;
  • 关键词:燕麦 ; 二氯喹啉酸 ; 苄嘧磺隆 ; 消解动态 ; 高效液相色谱
  • 英文关键词:Avena sativa;;quinclorac;;bensulfuron-methyl;;degradation dynamic;;high performance liquid chromatography
  • 中文刊名:草业科学
  • 英文刊名:Pratacultural Science
  • 机构:甘肃农业大学草业学院;草业生态系统教育部重点实验室;甘肃省草业工程实验室;中–美草地畜牧业可持续发展研究中心;
  • 出版日期:2019-03-15
  • 出版单位:草业科学
  • 年:2019
  • 期:03
  • 基金:国家燕麦荞麦产业体系(CARS-07-C)
  • 语种:中文;
  • 页:46-56
  • 页数:11
  • CN:62-1069/S
  • ISSN:1001-0629
  • 分类号:S481.8
摘要
为了研究二氯喹啉酸、苄嘧磺隆2种除草剂在燕麦(Avena sativa)田土壤中的残留降解特性,2016年4月分别以二氯喹啉酸推荐剂量225 g a.i.·hm~(-2)、1.5倍推荐剂量337.5 g a.i.·hm~(-2),苄嘧磺隆推荐剂量34 g a.i.·hm~(-2)、1.5倍推荐剂量51 g a.i.·hm~(-2)于燕麦3–4叶期喷施,探究2种除草剂在燕麦田土壤中0~60 d的自然降解情况。残留量用高效液相色谱法定量测定,结果表明,两种除草剂的降解均符合一级动力学模型,二氯喹啉酸在燕麦田土壤中的半衰期为23.6~26.7 d,苄嘧磺隆半衰期为17.9~20.1 d,均为易降解农药。该方法下,土壤添加水平为0.05、0.5和1.0 mg·kg~(-1)时,二氯喹啉酸和苄嘧磺隆的回收率分别为85.63%~89.27%和80.26%~91.61%,相对标准偏差分别为2.17%~6.33%和3.28%~6.52%。
        In order to study the residues and natural degradation characteristics of quinclorac and bensulfuron-methyl in oat(Avena sativa) field soil, we sprayed oat seedlings at the three-to four-leaf stage with the recommended dosage(225 g a.i.·hm~(-2)) and 1.5 times the recommended dosage(337.5 g a.i.·hm~(-2)) of quinclorac, and the recommended dosage(34 g a.i.·hm~(-2)) and 1.5 times the recommended dosage(51 g a.i.·hm~(-2)) of bensulfuron-methyl in April 2016. Residues were determined by high-performance liquid chromatography and the results showed that the degradation patterns of the two herbicides were consistent with a first order kinetic model. The half-lives of quinclorac and bensulfuron-methyl in oat field soil were 23.6~ 26.7 d and 17.9~ 20.1 d, respectively, and thus, it can be concluded that both pesticides are readily degradable. Under experimental conditions, the average recovery rates of quinclorac and bensulfuron-methyl at fortified levels of 0.05, 0.5, and 1.0 mg·kg~(-1) were 85.63%~ 89.27% and 80.26%~ 91.61%, respectively, with relative standard deviations of 2.17%~6.33% and 3.28%~6.52%, respectively.
引文
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