草甘膦铵盐在苎麻田的残留及消解动态  

Residue and field decline study of glyphosate-ammonium in ramie field

作　　者：王彦辉[1] 李欣[1] 周小毛[1] 柏连阳[1] 蔡海林[1] 

机构地区：[1]湖南农业大学农药研究所,长沙410128

出　　处：《农药学学报》2010年第2期201-206,共6页Chinese Journal of Pesticide Science

基　　金：国家现代麻类产业体系专项(nycytx-19-E09);国家自然科学基金资助项目(30971936)

摘　　要：建立了简单、灵敏的土壤及苎麻中草甘膦残留量的气相色谱检测方法。土壤样品用0.01mol/L的氢氧化钠水溶液提取,其他样品用水和丙酮提取,经阴离子交换柱(AG1-X8)净化,与原乙酸三甲酯(TMOA)和冰醋酸反应,用气相色谱带火焰光度检测器(FPD)检测,外标法定量。结果表明:当草甘膦在麻蔸和土壤中的添加水平在0.05～1mg/kg时,添加回收率分别为73.6%～102.6%和85.9%～105.1%,相对标准偏差分别为2.3%～8.1%和5.4%～13.0%。草甘膦的最小检出量(LOD)为0.5×10-10g,在麻蔸中的最低检测浓度(LOQ)为0.05mg/kg。2年3地的残留试验结果表明:草甘膦铵盐在湖南省、广西壮族自治区及福建省土壤中的半衰期分别为1.6～2.6d,1.0～1.8d和1.1～1.5d。无论是在高浓度处理区[有效成分3375g/hm2]还是在低浓度处理区[有效成分2250g/hm2],苎麻收获时(距施药60d),土壤和麻蔸样品中均未检出草甘膦铵盐。A simple,sensitive and selective method using gas chromatorgaphy equipped with flame photometric detector(GC-FPD)was developed to determine residues of glyphosate-ammonium in soil and ramie root.Soil samples were extracted with 0.01 mol/L sodium hydroxide and other samples were extracted with water and acetone.Glyphosate was previously derived with trimethylorthoacetate(TMOA)in the presence of acetic acid.Combination of AG1-X8 anion exchange chromatography with Florisil cartridge cleanup process was favorab...

关 键 词：草甘膦 草甘膦铵盐 苎麻 残留分析 消解动态 

分 类 号：TQ450.263[化学工程—农药化工]