为了提高茶叶农药残留的检测效率,从提取溶剂的选择、净化条件、线性回归、回收率及精密度等方面着手,开展了基于气相色谱-质谱联用法的绿茶中8种农药残留的同时检测研究。结果表明,在以乙腈为提取溶剂、以活性炭和PSA串联柱为固定相、以乙腈为洗脱剂、洗脱体积为12 m L的检测条件下,莠灭净在0～100μg/L范围,敌草胺在0～10000μg/L范围,其余农药在0～1000μg/L范围内,峰面积与样品质量浓度呈线性关系,相关系数均大于0.999。以茶叶农药残留量限值为添加量,重复测定6次,各农药平均加标回收率在73.6%～116.8%,相对标准偏差范围在1.47%～15.58%。说明所建立检测方法灵敏度高,选择性好,抗干扰能力强,可在茶叶多农残检测中推广应用。
To improve pesticide residues detection efficiency in tea, simultaneous de- termination of eight pesticide residues in green tea was developed based on gas chromatography-mass spectrometry （GC-MS）. The results showed that, - detected by the GC-MS under following conditions： acetonitrile as extraction and elution solvent, activated carbon and PSA tandem column as the stationary phase, elution volume of 12 ml the relationship between peak area and concentration of each residue （ametryn in the range of 0-100 pg/L, napropamide in the range of 0-10 000 gg/L, other pesticides in the range of 0-1 000 tJg/L） were linearly related, and their corre- lation coefficients were all greater than 0.999. The recovery rate the pesticides added to tea sample at legal concentration limits ranged from 73.6% to 116.8%, and the relative standard deviation from 1.47% to 15.58%. The new method we de- veloped is sensitive, specific and anti-interference, and thus provides test basis for the development of pesticide matrix reference materials in tea.
