超级微波消解-电感耦合等离子体质谱/发射光谱法测定再生聚对苯二甲酸乙二醇酯瓶片中31种元素含量

Determination of 31 kinds of elements in recycled polyethylene terephthalate bottle tablets by super microwave digestion and inductively coupled plasma optical emission spectrometry/mass spectrometry

中文关键词:  再生聚对苯二甲酸乙二醇酯  微波消解  电感耦合等离子体  元素含量

英文关键词:recycled polyethylene terephthalate  microwave digestion  inductively coupled plasma  element content

中文摘要:

      目的 建立超级微波消解-电感耦合等离子体质谱/发射光谱法测定再生聚对苯二甲酸乙二醇酯(recycled polyethylene terephthalate, rPET)瓶片中锑(Sb)、铬(Cr)、锌(Zn)等31种元素含量的筛查分析方法。方法 采用超级微波对瓶片样品进行消解, 采用电感耦合等离子体发射光谱法(inductively coupled plasma optical emission spectrometry, ICP-OES)和电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry, ICP-MS)分别测定7种和24种元素含量, 并用建立的方法对从工厂收集的40批次rPET瓶片样品进行检测。结果 方法检出限为0.02~5.24 mg/kg, 相关系数高于0.997, 加标回收率为76%~118%, 其相对标准偏差(relative standard deviations, RSDs)为0.7%~9.4%。40批次rPET样品都检出了Sb元素, 含量范围为126~208 mg/kg。有少量样品有Cr元素或Zn元素检出。结论 该方法能高效、准确、灵敏, 适用于rPET瓶片中31种元素含量的筛查, 也可为rPET的安全风险评估提供可靠的技术支持。

英文摘要:

      Objective To establish a screening method for the determination of total of 31 kinds of elements including antimony (Sb), chromium (Cr) and zinc (Zn) in recycled polyethylene terephthalate (rPET) flakes by inductively coupled plasma optical emission spectrometry/mass spectrometry with super microwave digestion. Methods The bottle flakes were digested by super microwave, and 7 and 24 kinds of elements were analyzed by inductively coupled plasma optical emission spectrometry (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS), respectively. The developed method was employed to determine the 40 batches of rPET flakes that collected from the factories. Results The limits of detection of method were in a range of 0.02?5.24 mg/kg, regression coefficient was greater than 0.997, the spike recoveries were 76%?118%, and relative standard deviations (RSDs) were 0.7%?9.4%. Sb was detected in 40 batches of rPET samples, and the content ranged from 126 to 208 mg/kg. Cr and Zn were also detected in some samples. Conclusion This method is efficient, accurate and sensitive, and it is suitable for the screening of 31 kinds of elements content in rPET samples, which provides technical assistance for safety risk assessment on rPET.