第 39 卷第 6 期Vol. 39 No. 6
2009 年 12 月Dec 2009

所属栏目:分析与测试

气相色谱法测定芦笋及其土壤中的苯醚甲环唑残留量
吴 曼1,陈九星2*,付启明3,4,陈力华2,任 竞2,聂思桥2,李晓刚1 (1. 湖南农业大学 生物安全科学技术学院,湖南 长沙 410128;2. 湖南化工研究院 国家农药创制工程技术研究中心,湖南 长沙 410007;3. 湖南大学 环境科学与工程学院,湖南 长沙 410082;4. 湖南大学 环境生物与控制教育部重点实验室,湖南 长沙 410082)
摘 要:建立了气相色谱法测定芦笋及其土壤中苯醚甲环唑残留量的分析方法。实验结果表明:在苯醚甲环唑添加量为0.02~1.5 mg/kg范围内苯醚甲环唑在芦笋茎枝中的平均添加回收率在87.47%~92.04%之间,相对标准偏差在4.58%~9.90%之间;在芦笋嫩茎中的平均添加回收率在91.35%~98.31%之间,相对标准偏差在5.34%~7.05%之间;在土壤中的平均添加回收率在91.64%~94.54%之间,相对标准偏差在5.02%~7.30%之间,方法的最小检出量为2.0×10-11 g,最小检测浓度为0.002 mg/kg。采用本方法测定10%苯醚甲环唑WG在湖南长沙芦笋茎枝及其土壤中的消解动态,符合一级动力学消解模式,其消解方程分别为Y=19.199e-0.2708x和Y=0.136 6e-0.1054x,相关系数分别为0.973 2和0.941 4,在芦笋茎枝中的半衰期为2.56 d;在土壤中的半衰期为6.57 d。
关键词:气相色谱;苯醚甲环唑;残留;芦笋;土壤
中图分类号:TQ450.2+63  文献标识码:B  文章编号:
Determination of Difenoconazole Residue in Asparagus and Soil with GC
WU Man1,CHEN Jiu-xing2*,FU Qi-ming3,4,CHEN Li-hua2,REN Jing2,NIE Si-qiao2,LI Xiao-gang1 (1. College of Bio-safety Science & Technology,Hunan Agricultural University,Changsha 410128,China;2. National Engineering Research Center for Agrochemicals,Hunan Research Institute of Chemical Industry,Changsha 410007,China;3. College of Environmental Science and Engineering,Hunan University,Changsha 410082,China;4. Key Laboratory of Environmental Biology and Pollution Control(Hunan University),Ministry of Education,Changsha 410082,China)
Abstract:A method was established for determination of difenoconazole residue in asparagus and soil with gas chromatography. At concentration range from 0.02 mg/kg to 1.5 mg/kg,the average recovery of difenoconazole in asparagus plant,asparagus and soil sample of asparagus was 87.47%~92.04%,91.35%~98.31% and 91.64%~94.54%,respectively. The corresponding relation standard deviation(RSD)was 4.58%~9.90%,5.34%~7.05% and 5.02%~7.30%,respectively. The limit of detection was 2.0×10-11 g and the limit of quantification of method for difenoconazole was 0.001 76 mg/kg in asparagus and soil. The degradation of 10% difenoconazole WG in asparagus and soil in Hunan Changsha was investigated using above method. The results showed that the degradation of asparagus and soil was in accordance with the regression equation. The residue degradation equation of difenoconazole in asparagus and soil was Y=19.199e-0.270 8x and Y=0.136 6e-0.105 4x,respectively,with correlation coeficient being 0.973 2 and 0.941 4. The half life of difenoconazole in asparagus plant and in soil was 2.56 d and 6.57 d,respectively.
Key words:GC;difenoconazole;residue;asparagus;soil
作者简介:吴 曼(1989-),女,安徽金寨人,研究方向:农药残留分析。
联 系 人:陈九星,研究员。(E-mail:cjx1964_1@163.com)
收稿日期:2009-10-20