微波消解-电感耦合等离子体质谱法测定滑石粉中多种痕量金属元素

样品经微波消解后，应用电感耦合等离子体质谱法测定了滑石粉中Pb、Cd、Cr、As、Sb、Cu、Zn、Mn、Ni、Mo、Co、Sr共12种痕量金属元素。考察了微波消解体系、质谱干扰和基体效应等因素对测定的影响。结果表明：在最佳消解程序（在250 W消解 2 min，在0 W停留 2 min，在450 W消解 5 min，在550 W消解 5 min ）下15 mL硝酸能够完全消解0.5 g 滑石粉样品，质谱干扰可以通过选择同位素以及校正方程消除，基体效应的影响可以在线加入合适的内标元素克服。将方法应用于实际样品分析，待测元素的加标回收率在95 %～109 %之间，相对标准偏差（RSD，n=8）在2.1 %～12.0 %范围，测定结果与石墨炉原子吸收光谱法（GF-AAS）、电感耦合等离子体原子发射光谱法（ICP-AES）和氢化物-原子荧光光谱法（HG-AFS）基本吻合。

Determination of multiple trace elements in talcum powder by inductively coupled plasma mass spectrometry after microwave digestion

After microwave digestion,the content of 12 trace metal elements in talcum powder was determined by inductively coupled plasma mass spectrometry,including Pb,Cd,Cr,As,Sb,Cu,Zn,Mn,Ni,Mo,Co and Sr.The results showed that 0.5 g of talcum powder sample could be fully digested with 15 mL of nitric acid under optimal digestion procedures(digestion at 250 W for 2 min,keeping at 0 W for 2 min,digestion at 450 W for 5 min and then digestion at 550 W for 5 min).The mass spectrometric interference could be eliminated ...