建立了茶叶中29种酸性除草剂残留量的气相色谱-质谱测定与确证方法.采用乙腈超声振荡提取试样中29种酸性除草剂,石墨化炭黑固相萃取柱净化,三甲基硅烷化重氮甲烷衍生化,再经弗罗里硅土固相萃取柱净化,用气相色谱-质谱法选择离子监测方式测定,外标法定量,根据离子丰度比确证.在加标水平为0.01,0.05,0.1 mg/kg 时,29种目标物的加标回收率为57.1% ～120.4% ,相对标准偏差(RSD)为4.3% ～20.9% ;方法的检出限在0.002～0.005 mg/kg 之间.该方法准确、灵敏、快速,可满足国际上对茶叶中29种酸性除草剂残留的检测需要.
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