【摘要】 目的通过对气相色谱法检测原料乳中农药残留量的测量过程不确定度来源的系统分析,提高对原料乳中农药残留量的检测水平和能力,并找出影响测量结果不确定度的主要因素;方法确立检测过程数学模型,用气相色谱法检测原料乳中有机磷农药残留量、对测量过程不确定度进行评价。结果原料乳中有机磷农药残留量的测量标准不确定度由称量、样品提取过程、稀释过程、标准物质、进样体积和仪器校准值引入的不确定度各组分合成。测量结果的扩展不确定度按式U=k×CX×urel(合)计算。测定结果报告C=CX±U,以加入农药标准物质至0.4mg/kg的原料乳做气相色谱法检测6种有机磷残留量分别报告为(0.4±0.050)mg/kg、(0.4±0.029)mg/kg、(0.4±0.027)mg/kg、(0.4±0.029)mg/kg、(0.4±0.057)mg/kg、(0.4±0.034)mg/kg。结论从气相色谱法检测原料乳中农药各组分残留量的测量不确定度分量汇总分析可以看出,测量不确定度一般来源于随机性和模糊性,是由许多分量组成,其分量可用统计分布来进行评价,并且以实验标准(偏)差表征。更多还原

【Abstract】 Objective To enhance the level and ability of measuring pesticide residues in raw milk and find out the primary factors of affecting measurement uncertainty.Methods The mathematic model of measurement was established in order to evaluate measurement uncertainty of organophosphorus pesticide residues in raw milk with gas chromatography.Results The standard measurement uncertainty of organophosphorus pesticide residues in raw milk made up of weighing,sampling and diluting procedures,standard matter,sample volume,instrument calibration.The calculating formula of expanded measurement uncertainty was U=k×CX×urel(tptal).The expression of measurement result was C=CX±U.Volume of 6 kinds of organophosphorus pesticides residues were 0.4±0.050,0.4±0.029,0.4±0.027,0.4±0.029,0.4±0.057,0.4±0.034(mg/kg) respectively in raw milk which the standard matter of pesticide was added in.Conclusion From the evaluation of measurement uncertainty of pesticide residues in raw milk with gas chromatography,we can see that the measurement uncertainty is composed of many factors,which commonly comes from random variable and fuzzification,and can be assessed by statistic distribution and standard deviation.更多还原