草甘膦铵盐在苎麻田的残留及消解动态

被引:10
作者
王彦辉
李欣
周小毛
柏连阳
蔡海林
机构
[1] 湖南农业大学农药研究所
关键词
草甘膦; 草甘膦铵盐; 苎麻; 残留分析; 消解动态;
D O I
暂无
中图分类号
TQ450.263 []; O657.71 [];
学科分类号
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。
引用
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页码:201 / 206
页数:6
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