摘要
【目的】研究不同海拔地区灭幼脲在4种叶类蔬菜植株和土壤中的消解动态及最终残留量的差异,为将灭幼脲用于高海拔地区叶类蔬菜虫害的防治提供研究基础。【方法】采用超高效液相色谱-串联质谱(UPLC-MS/MS)在西藏拉萨市和四川彭州市开展大白菜、小白菜、生菜、芹菜和土壤中灭幼脲的消解动态和最终残留的测定。【结果】灭幼脲在芹菜、生菜、大白菜和小白菜植株中的平均半衰期分别为7.0 d(西藏)和11.6 d(四川)、3.0 d(西藏)和4.4 d(四川)、3.4 d(西藏)和6.2 d(四川)、2.0 d(西藏)和2.0 d(四川);其在土壤中的平均半衰期分别为11.0 d(西藏)和21.0 d(四川)。灭幼脲在拉萨市4种叶类蔬菜和土壤中的半衰期均短于彭州市4种相应叶类蔬菜和土壤中的半衰期,但灭幼脲半衰期的长短在不同海拔地区的4种叶类蔬菜中呈现相同的趋势,即小白菜<生菜<大白菜<芹菜。灭幼脲施药量为114 mL(a.i)/hm^(2),施药2次,施药间隔7 d,施药7 d后拉萨市和彭州市所有蔬菜中的灭幼脲残留量均符合最大残留限量标准(MRLs),灭幼脲在4种叶类蔬菜中的安全风险较小。【结论】4种叶类蔬菜和土壤中灭幼脲的半衰期在高海拔地区较低海拔地区缩短,蔬菜品种和不同地区的种植环境与农药的半衰期有密切关联,高海拔地区较低海拔地区为灭幼脲残留的低风险区域。
【Objective】In order to provide the research basis for the application of chlorbenzuron on leaf vegetables at high-altitude localities,the residue and degradation dynamics of chlorbenzuron in four leaf vegetables and soil at different elevations were analyzed in the present paper.【Method】An UPLC-MS/MS method was established to determine the residue and degradation dynamics of chlorbenzuron in bok choy,Chinese cabbage,leaf lettuce,celery and the soil samples at Lhasa,Tibet and Pengzhou,Sichuan.【Result】The results showed that the average half-lives of chlorbenzuron in celery,leaf lettuce,Chinese cabbage and bok choy were 7.0 days(Tibet)and 11.6 days(Sichuan),3.0 days(Tibet)and 4.4 days(Sichuan),3.4 days(Tibet)and 6.2 days(Sichuan),2.0 days(Tibet)and 2.0 days(Sichuan).The average half-lives of chlorbenzuron in soil were 11.0 days(Tibet)and 21.0 days(Sichuan).The half-lives of chlorbenzuron in four leaf vegetables and soil samples at Lhasa were shorter than that at Pengzhou.However,the half-lives of chlorbenzuron in four leaf vegetables at different areas were consistent.And the shortest half-live of chlorbenzuron in four crops was bok choy,followed by leaf lettuce,Chinese cabbage and celery.When the dosage,spraying times and interval were 114 mL(a.i)/hm^(2),twice and 7 days,respectively,the final residues of chlorbenzuron in all vegetables at Lhasa and Pengzhou were conformed to the maximum residue limits(MRLs),the safety risk of chlorbenzuron in four vegetables were low.【Conclusion】The half-lives of chlorbenzuron in four leaf vegetables in the high-altitude areas were shorter than that in the low-altitude areas,the vegetables’varieties and growing environment in different areas were closely related to the half-lives of chlorbenzuron,the residues of chlorbenzuron in high-altitude areas were lower than that in low-altitude.
作者
代艳娜
潘虎
刘青海
杨晓凤
DAI Yan-na;PAN Hu;LIU Qing-hai;YANG Xiao-feng(Institute of Agricultural Product Quality Standard and Testing Research,Tibet Academy of Agricultural and Animal Husbandry Sciences,Tibet Lhasa 850032,China;Analysis anti Testing Center of Sichuan Academy of Agricultural Sciences,Sichuan Chengdu,510066 China)
出处
《西南农业学报》
CSCD
北大核心
2021年第5期1106-1112,共7页
Southwest China Journal of Agricultural Sciences
基金
西藏自治区科技厅重点研发与转化项目(XZ201801NB07)
西藏自治区科技厅自然基金(XZ2019ZRG-091)
国家农产品质量安全风险评估专项(GJFP2020007)
西藏自治区财政专项(XZNKYZBS-2020-C-029)。
关键词
西藏
四川
灭幼脲
叶类蔬菜
土壤
残留
消解动态
Tibet
Sichuan
Chlorbenzuron
Leaf vegetables
Soil
residues
Degradation dynamics
