电感耦合等离子体质谱法同时测定塑料食品接触材料原料和成型品中11种元素溶出量

Simultaneous Determination of Eleven Elements Released from Plastic Food Contact Materials and Articles by Inductively Coupled Plasma-Mass Spectrometry

建立电感耦合等离子体质谱法同时测定铅(Pb)、镉(Cd)、铬(Cr)、砷(As)、汞(Hg)、锑(Sb)、锌(zn)、锗(Ge)、镍(Ni)、硒(Se)和钡(Ba)11种元素溶出量的方法。方法采用4%乙酸作为模拟液,在特定时间和温度条件下浸泡样品,浸泡液加入金稳定剂后过0.45 μm滤膜上样,质谱检测,内标法定量分析。在优化条件下,11种元素在0.1~100 μg/L质量浓度范围内线性良好,相关系数均大于0.999。在低、中、高3个水平进行添加实验,上述元素的平均回收率在97.5%~106.2%之间,重复性精密度在0.72%~2.76%(n=6)之间。结果表明,方法操作简单快速、重复性好、准确度高。

An inductively coupled plasma-mass spectrometry(ICP-MS) method was developed and applied to determine lead, cadmium, chromium, arsenic, mercury, antimony, zinc, germanium, nickel, selenium and barium released from plastic food contact materials and articles. Samples were immersed in 4% acetic acid, and incubated for a specific time at a specific temperature. After being added with gold stabilizer, the immersion solution was filtered through a 0.45 μm microporous membrane, and then analyzed by ICP-MS. The quantification was performed by internal standard method. Under the optimum conditions, the calibration curves were linear in the range of 0.1 to 100 μg/L with correlation coefficients(r) above 0.999. The method provided recoveries of 97.5%–106.2% at low, medium and high spiked concentrations with relative standard deviation(RSD) in the range of 0.72% to 2.76%. The satisfied experimental results indicated that the proposed method is simple, fast, reproducible, accurate and useful to determine eleven elements.