气相色谱-质谱法测定食用植物油中3-氯丙醇酯的不确定评估

Uncertainty evaluation for determination of 3-chloride propyl alcohol ester in edible vegetable oil by gas chromatography-mass spectrometry

目的评估气相色谱-质谱法面积比法测定食用植物油中3-氯丙醇酯的不确定度。方法根据JJF1059.1-2012《测量不确定度的评定和表示》,不确定度的主要来源为标准品、检测仪器和样品等参数,同时对各不确定度分量进行合成和扩展。结果当取样量为0.0100 g,k=2(95%置信度),测得的食用植物油中3-氯丙醇酯含量为(6.04?0.10)mg/kg。结论本方法可为评定食用植物油中3-MCPD酯含量的测量结果和方法的可靠性提供科学依据。

Objective To evaluate the uncertainty of determination of 3-chloride propyl alcohol ester（3-MCPD esters） in edible vegetable oil by gas chromatography-mass spectrometry with area ratio method. Methods According to JJF 1059.1-2012 The measurement uncertainty evaluation and presentation, the main sources of uncertainty were standard, instrument, samples and other parameters. Meanwhile each uncertainty component was combined and extended. Results When the sample quantity was 0.0100 g, k=2（95% confidence level）, the 3-MCPD esters content in edible vegetable oil was（6.04 ？ 0.10） mg/kg. Conclusion The established method can provide scientific basis for evaluation of the reliability of the measurement method and results of 3-MCPD esters.