ICP-MS法测定陶瓷食品包装容器中的重金属

采用电感耦合等离子体质谱法(ICP-MS)同时测定了陶瓷食品包装容器中的重金属元素铅、镉、铬、钴、镍、锌、锑，并对影响测量的各因素进行了详细的研究。该方法的检出限为0.002～0.18 μg·L-1，加标回收率为95.8%～104.4%，相对标准偏差为1.1%～3.3%。该方法快速、简便、具有较好的准确度和精密度，对进出品陶瓷制品的日常检验提供了依据。

Determination of Heavy Metals in Ceramic Food Packaging Containers by ICP-MS

The direct determination method of heavy metals, Pb, Cd, Cr, Co, Ni, Zn, As and Sb in food packaging ceramics was studied by using inductive coupled plasma mass spectrometry (ICP-MS). Factors influencing the determination were also studied in detail. By choosing the optional operating parameters and appropriate isotopes of the element to be detected, the influence of mass spectrometry interference was conquered effectively. The detection limits were 0.023 μg·L -1 for Pb, 0.004 μg·L -1 for Cd, 0.030 μg·L -1 for Cr, 0.025 μg·L -1 for Ni, 0.012 μg·L -1 for Sb, 0.180 μg·L -1 for Zn, 0.017 μg·L -1 for As, and 0.002 μg·L -1 for Co. The recovery rates of the method were between 95.8% and 104.4%. The RSDs were between 1.1% and 3.3%. The method was simple, rapid, precise, convenient and suitable for daily inspection of import and export ceramic ware.