微波灰化-电感耦合等离子体质谱法测定电泳涂料中15种金属元素

Determination of fifteen elements in electrophoretic coating by microwave ashing-inductively coupled plasma mass spectrometry

建立电感耦合等离子体质谱法测定电泳涂料中15种金属元素的分析方法。以微波灰化方式处理样品,采用碰撞诱导解离(CID)-动能歧视(KED)联合模式消除质谱干扰,实现高浓度元素和痕量元素的同时检测;采取气体稀释模式降低基体干扰并减少高浓度元素对质量检测器的损害。Na、Mg、Al、K、Ca、Fe和Zn质量浓度在0.01~10.0mg/L范围内,Cu、Mn、Ni、Co、Cr、Cd、Ba和Pb的质量浓度在1.0~1000.0 g/L范围内线性关系良好,线性相关系数为0.9991~0.9999,方法检出限为0.3~23μg/kg。测定结果的相对标准偏差为0.6%~3.2%(n=6),样品加标回收率为91.5%~107.0%。该方法可用于汽车电泳涂料中金属元素的检测。

The determination method of fifteen metal elements in electrophoretic coating by inductively coupled plasma mass spectrometry with microwave ashing pretreatment was established.The collision induced dissociation(CID)and kinetic energy(KED)mode were used to depressed mass spectrum interference of high and trace elements detection simultaneously.Gas dilution was used to reduce matrix interference and the damage and realized detection of high concentration elements to the quality detector.The linear ranges were 0.01-10.0 mg/L of sodium,magnesium,aluminium,potassium,calcium,iron,zinc,1.0-1000.0μg/L of copper,manganese,nickel,cobalt,chromium,cadmium,barium and lead with the well linear relationship,and the correlative coefficients were 0.9991-0.9999.The detection limits of the method were 0.3-23μg/kg.The relative standard devivations of the detection results were in the range of 0.6%-3.2%(n=6).The spiked recoveries were between 91.5%and 107.0%.The method is suitable for the determination of metal elements in automotive electrophoretic coatings assessment.