等离子体质谱-氧气碰撞池技术测定复杂基体样品中痕量砷和硒  

Determination of Trace As and Se in Complex Matrix Sample by Inductively Coupled Plasma-Mass Spectrometry with O_2 Collision/Reaction Cell

作　　者：陆秉源[1] 陆文伟[2] 朱玮琳[3] 陆嫣[3] 

机构地区：[1]华东理工大学中德工学院环境科学与工程,上海200237 [2]上海交通大学,上海200030 [3]上海大学应用化学系,上海200044

出　　处：《分析化学》2009年第12期1781-1785,共5页Chinese Journal of Analytical Chemistry

摘　　要：本实验采用氧气碰撞/反应池技术促使分析物生成氧化物离子,避开原来的双电荷离子干扰。同时采用负的动能歧视效应来改善氧化物离子的通过率,对在新的谱线位置上出现同量异位素干扰辅以数学校正方法。实验发现,有机试剂的增敏效应同样适合于As和Se的氧化物离子,1%甲醇溶液用于改善As和Se的分析灵敏度。在解决这类样品中微量As和Se的分析难题上,本方法显示了很好的效果,检出限为:As 0.0045μg/L,Se 0.0062μg/L,背景等效浓度:As 0.022μg/L,Se 0.025μg/L,分析结果的误差在标准物质的允许误差范围内,极大改善了实际样品分析结果的准确度。The O2 collision cell technology was accepted to move the analyte to new oxide line position in stead of attenuating the double charge ions directly. A minus kinetic energy discrimination configuration was used to promote the oxide ions passing. An isobaric interference on new oxide line was corrected by a mathematie equation. It was found the enhancing effect of organic reagent benefit to As and Se oxide ion signal also. The 1% methanol sample solution was applied to improve the analyte sensitivity. The detection limits were 4.5 ng/L for As and 6.2 ng/L for Se. The background equivalent concentration was 0.022μg/L for As and 0.025μg/L for Se. The analysis errors enter into the allowed range of the standard material, greatly improve the analytical accuracy of the actual sample.

关 键 词：电感耦合等离子体质谱 复杂基体 砷 硒 氧气 碰撞/反应池 

分 类 号：O657.63[理学—分析化学] X830.5[理学—化学]