气相色谱法测定果蔬中敌敌畏加标含量的不确定度评定

Evaluation of uncertainty in the determination of dichlorvos in fruits and vegetables by gas chromatography

根据T/CAQI 210-2021《果蔬清洗装置》附录B、GB 2763-2021《食品安全国家标准食品中农药最大残留限量》和JJF 1059.1-2012《测量不确定度评定与表示》的要求,建立气相色谱法测定果蔬中敌敌畏加标含量的方法,对试验过程进行分析,找出影响不确定度的各因素,对其各个分量进行评定和合成。其结果显示,样品处理过程引入的不确定度最大,其次是储备液与标准溶液的配制过程。当敌敌畏加标量为0.3 mg/kg,扩展不确定度为0.048 mg/kg,则其测量不确定度报告:w=(0.30±0.048)mg/kg,(P=95%,k=2)。

According to the requirements of Appendix B of T/CAQI 210-2021"Fruit and Vegetable Cleaning Device",GB 2763-2021"National food safety standard—Maximum residue limits for pesticides in food",and JJF 1059.1-2012"Evaluation and Expression of Uncertainty in Measurement",a method for the determination of the spiked content of DDVP in fruits and vegetables by gas chromatography was established,analyze the test process,find out the factors that affect the uncertainty,and evaluate and synthesize each component.The results show that the uncertainty introduced in the sample processing process is the largest,followed by the preparation process of stock solution and standard solution,and the uncertainty introduced in the linear fitting and repeated determination of samples is small.When the standard added amount of dichlorvos is 0.3 mg/kg and the expanded uncertainty is 0.048mg/kg,the measurement uncertainty report is:w=(0.30±0.048)mg/kg,(P=95%,k=2).