微波消解-ICP-MS法测定木质包装材料中重金属元素

Determination of Heavy Metal Elements in Wooden Packing Materials by Microwave Digestion and ICP-MS

目的采用微波消解法处理木质包装材料,建立了电感耦合等离子体质谱法（ICP-MS）法测定木质包装材料中铬、钴、镍、铜、砷、硒、镉、锑、钡、汞、铊、铅等12种重金属元素的方法。方法样品用HNO3-H2O2混合酸进行微波消解,选择45Sc,72Ge,115In,209Bi等元素,作为内标校正基体干扰和信号漂移,采用八级杆碰撞/反应池技术消除质谱干扰,优化了仪器的工作条件。结果待测元素的标准曲线相关系数为0.9997~1.0000,方法检出限为0.01~0.28μg/L,加标回收率为89.4%~112.5%,相对标准偏差（RSD）为0.75%~3.81%。结论该方法快速简便、准确可靠,可用于测定木质包装材料中的重金属元素。

To establish a method for the determination of Cr, Co, Ni, Cu, As, Se, Cd, Sb, Ba, Hg, Tl and Pb in wooden packing materials by inductively coupled plasma-mass（ICP-MS） with microwave digestion. HNO3＋H2O2were used to completely digest the sample by microwave.45 Sc,72Ge,115 In and209Bi were used as internal standard elements to compensate matrix effect and signal drift. Octpole collision and reaction cell system（ORS） was used to compensate mass effect. The working parameters of the instrument were optimized. For all elements, the correlation coefficient was between 0.9997 and1.0000. The detection limits were between 0.01 μg/L and 0.28 μg/L. The recoveries of the method were between 89.4%and 112.5%. The relative standard deviations were between 0.75% and 3.81%. The method was simple, quick and accurate.It was suitable for the determination of the contents of heavy metal elements in wooden packing materials.