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目的依据GB/T 5009.19-2008《食品中有机氯农药多组分残留量的测定》,对气相色谱法(gas chromatography,GC)测定牛奶中艾氏剂、狄氏剂的测量结果不确定度进行评定。方法通过建立GC法测定艾氏剂、狄氏剂残留量的数学模型,找出影响不确定度的因素,并对各不确定度分量进行评估、计算,由此计算合成不确定度,得出测量结果的扩展不确定度,从而建立了牛奶中艾氏剂、狄氏剂测定不确定度评定方法。结果牛奶中艾氏剂、狄氏剂测定结果的合成不确定度分别为0.076、0.059,艾氏剂的检测结果可表示为(5.21±0.79)μg/kg,狄氏剂的检测结果可表示为(4.93±0.56)μg/kg;标准曲线、样品前处理过程和仪器测量重复性引入的不确定度对艾氏剂、狄氏剂检测结果影响较大。结论测量不确定度评定方法的确立对牛奶中艾氏剂、狄氏剂检测和结果判定有重要意义。
Objective According to GB / T 5009.19-2008 Determination of Organochlorine Pesticides Residues in Food by Gas Chromatography (GC), the measurement uncertainty of Aldrin and Dieldrin in milk was determined assessment. Methods The mathematical model of aldrin and dieldrin residue was established by GC method to find out the factors that affect the uncertainty. The uncertainty components were evaluated and calculated to calculate the uncertainty of synthesis. The result of the uncertainty of the expansion of the measurement, thus establishing a determination of Aldurfactants in milk, determination of Dieldrin uncertainty. Results The uncertainty of determination of aldrin and dieldrin in milk was 0.076 and 0.059, respectively. The test result of aldrin was (5.21 ± 0.79) μg / kg. The test results of dieldrin can be expressed as (4.93 ± 0.56) μg / kg. The uncertainty of the standard curve, the sample pretreatment process and the repeatability of the instrumental measurement greatly influenced the test results of aldrin and dieldrin. Conclusion The establishment of the evaluation method of measurement uncertainty is of great significance to the determination of Aldrin and Dieldrin in milk.