胡华峰，张志刚，徐蕊
（华润怡宝饮料（中国）有限公司技术中心，广东深圳，518000）

摘要：依据SN/T 3385-2012《食品接触材料高分子材料聚对苯二甲酸乙二醇酯（PET）树脂及其制品中乙醛的测定顶空气相色谱法》规定的检测方法，通过从生产、抽样、样品前处理和仪器分析等完整流程，客观、详细地计算引入不确定度。当置信概率约为95%，扩展因子k=2，试样乙醛含量为0.482滋g/g 时，其扩展不确定度为0.057滋g/g，结果显示，对合成标准不确定度贡献较大的是样品测量重复性、标准溶液配制到标准曲线的建立过程、样品的前处理。

关键词：PET；乙醛；不确定度；切片粒子；瓶；瓶坯

Uncertainty Evaluation in Determining Acetaldehyde Content in Bottle Grade PET Resin and Article

HU Hua-feng，ZHANG Zhi-gang，XU Rui
（Technology Center，China Resources C’estbon Beverage（China）Co.，Ltd，Shenzhen 518000，China）

Abstract: Accordingtothe detectionmethodspecifiedin SN/T3385-2012“Food contactmaterials—Polymer—Determination of acetaldehyde in polyethylene terephthalate（PET）resin and article—Headspace gas chromatography”，the uncertainty is calculated objectively in detail through a complete process from production，sampling，sample pretreatment and
instrumental analysis.When the confidence probability is about 95%，the expansion factor，k=2，and the acetaldehyde content is 0.482滋g/g，the extended uncertainty is 0.057滋g/g. The results show that what contribute a lot to the combined standard uncertainty are the measurement repeatability，the establishment process from the standard solution preparation to the standard curve，and the sample pretreatment.

Key words: polyethylene terephthalate（PET）；acetaldehyde；uncertainty；chips；bottle；preform

（2019年第22卷第4期）