碰撞/反应池-电感耦合等离子体质谱法同时测定肉类食品中的5种有害元素  

Simultaneous determination of 5 harmful elements in meat food by collision / reaction pool-inductively coupled plasma mass spectrometry

作　　者：李敏[1] 王紫纹[1] 刘佳[1] 

机构地区：[1]北京市西城区疾病预防控制中心,北京100120

出　　处：《中国卫生检验杂志》2015年第23期4034-4037,4040,共5页Chinese Journal of Health Laboratory Technology

摘　　要：目的建立碰撞/反应池-电感耦合等离子体质谱法(KED/DRC-ICP-MS)同时测定肉类食品中5种有害元素(铅、镉、铬、镍、砷)的分析方法。方法采用压力罐密闭消解方式进行样品前处理,同时使用动能歧视技术,He作为反应气体;动态反应池技术,NH_3作为反应气体,消除质谱测定中的多原子离子光谱干扰。结果实验表明,该方法中采用动能歧视技术、动态反应池模式测定时,灵敏度和精密度不会降低,与标准模式相比更加稳定,准确度更好。各元素线性关系良好(r>0.999 0),方法的检出限为0.023 7μg/L^0.079 5μg/L,回收率为95.1%~103.8%,相对标准偏差(RSD)<4.32%。结论该方法准确、简便、快速、灵敏,可为肉类食品中重金属元素的检测与控制提供方法参考。Objective To establish a collision / reaction tank by inductively coupled plasma mass spectrometry（ KED / DRC-ICP-MS） analysis method for simultaneously determining cadmium,lead,nickel,chromium,arsenic in meat food. Methods Using the pressure tank digestion methods for sample pretreatment,and kinetic energy discrimination technology（ KED）,helium（ He） as the reaction gas; dynamic reaction cell technology,ammonia（ NH3） as the reaction gas,eliminating mass spectrometric determination of multi atom spectrum interference. Results The experiment showed that,in KED,DRC mode using the method,sensitivity and precision did not reduced,compared with the standard model,which was more stable and accurate. Each element was of good linear relationship（ r 0. 999 0）,the detection limit of the method ranged from 0. 023 7 g / L to 0. 079 5 g / L,with the recovery rate of 95. 1%-103. 8%,and RSD 4. 32%. Conclusion The method is accurate,simple,rapid,sensitive,and can provide reference for the detection and control of harmful elements in meat food.

关 键 词：电感耦合等离子体质谱法 质谱干扰 动态反应池 重金属 

分 类 号：O657.63[理学—分析化学]