通过评定食品接触用塑料制品中3种典型邻苯二甲酸酯测定的不确定度，保证检验检测数据的准确性。依据GB 31604.30—2016对样品中3种典型邻苯二甲酸酯含量进行测定分析，确定检测结果的不确定度来源，通过数学模型计算主要影响因素的不确定度情况，得到食品接触用塑料制品中3种典型邻苯二甲酸酯检测结果的扩展不确定度。依据GB 31604.30—2016测定塑料制品中3种典型邻苯二甲酸酯含量，不确定度的主要影响因素为标准溶液配制过程、标准曲线拟合和仪器等。3种典型邻苯二甲酸酯的测量过程中最大的影响因素是标准曲线拟合时引入的相对标准不确定度，其中邻苯二甲酸二异丁酯（DIBP）为0.032 5，邻苯二甲酸二丁酯（DBP）为0.030 3，邻苯二甲酸二（2-乙基）己酯（DEHP）为0.028 2。可通过提高实验人员操作能力水平、选择适当的标准工作溶液的浓度点和进行仪器维护保养等，保证检验检测数据的准确性。

By evaluating the uncertainty of the determination of three typical phthalates in plastic products used in food contact, the accuracy of inspection and detection data was ensured. According to GB 31604.30—2016, the content of three typical phthalates in the sample was measured and analyzed to determine the sources of uncertainty in the detection results. The uncertainty of the main influencing factors was calculated through mathematical models, and the expanded uncertainty of the detection results of three typical phthalates in plastic products in contact with food was summarized. GB 31604.30—2016 was used to determine the content of three typical phthalates in plastic products. The main influencing factors of uncertainty were the preparation process of standard solutions, fitting of standard curves, and instruments. In the measurement process of three typical phthalate esters, the largest influencing factor was the relative standard uncertainty introduced during the fitting of the calibration curve, with 0.032 5 for DIBP, 0.030 3 for DBP, and 0.028 2 for DEHP. The accuracy of inspection and detection data can be ensured by improving the operational ability of experimental personnel, selecting appropriate concentration points of standard working solutions, and performing instrument maintenance.