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建立了评定GB/T 20770—2008《粮谷中486种农药及相关化学品残留量的测定——液相质谱联用法》中影响测量多菌灵不确定度多因素数学模型,考察了样品前处理及质谱测定的各个环节,根据建立的模型计算评定测量不确定度的各分量。采用该方法测得糯米中多菌灵的残留量为26.8×10-3±0.78×10-3mg/kg。分析表明,多菌灵残留量测定的不确定度主要来源于标准溶液的配制、样品前处理制备过程和样品溶液的平行测定差异。经计算,在置信概率P=95%时,运用该方法测定试样中多菌灵残留的相对标准合成不确定度为1.46%,标准不确定度为0.39×10-3mg/kg,扩展不确定度(K=2)为0.78×10-3mg/kg。
Established a multi-factor mathematical model to assess the uncertainty of measuring carbendazim in GB / T 20770-2008, “Determination of 486 Pesticides and Related Chemical Residues in Grain Grains - Liquid Chromatography-Mass Spectrometry” And mass spectrometry in all aspects, according to the model established to measure the measurement uncertainty of the components. The residual amount of carbendazim in glutinous rice measured by this method was 26.8 × 10-3 ± 0.78 × 10-3mg / kg. The analysis shows that the uncertainty of the determination of carbendazim residue mainly comes from the preparation of standard solution, the difference of parallel determination between sample preparation and sample preparation. It is calculated that the relative standard synthetic uncertainty of 1.36% for the determination of carbendazim residues in the sample by this method at a confidence probability P = 95% is 0.39 × 10-3mg / kg with an uncertainty of expansion Degree (K = 2) was 0.78 x 10-3 mg / kg.