碰撞反应池-电感耦合等离子体质谱法检测海藻食品中重金属

Determination of heavy metals in seaweed food by inductively coupled plasma-mass spectrometry with octopole reaction system

中文关键词:  电感耦合等离子体质谱  碰撞反应池  海藻  重金属

英文关键词:inductively coupled plasma-mass spectrometry  octopole reaction system  seaweed  heavy metal

中文摘要:

      目的 建立碰撞反应池—电感耦合等离子体质谱法(inductively coupled plasma-mass spectrometry，ICP-MS)测定海藻食品中铬、镍、铜、砷、镉、汞、铅等重金属元素的分析检测方法。方法 样品经微波消解后用电感耦合等离子体质谱仪直接进行分析, 采用内标元素72Ge、115In和209Bi消除基体干扰和信号漂移, 碰撞反应池技术(ORS)消除质谱干扰。结果 各元素校正曲线的相关系数均大于0.9992, 方法的检出限0.003 μg/L~0.028 μg/L, 相对标准偏差小于4.92%, 加标回收率为85.6%~106.2%, 标准参考物质的测定结果与标准值相符。结论 该方法前处理操作简便快速, 灵敏度高, 重复性好, 适用于海苔、海带、紫菜等海藻食品中多种元素的同时测定。

英文摘要:

      Objective To establish an analysis method of inductively coupled plasma-mass spectrometry (ICP-MS) with octopole reaction system for the determination of 7 heavy metals including Cr, Ni, Cu, As, Cd, Hg and Pb in seaweed food．Methods After microwave digestion, the samples were directly determined by ICP-MS. Internal standard elements of germanium (72Ge), indium (115In) and bismuth (209Bi) were used to correct matrix interference and signal drifting, and the octopole reaction system (ORS) was used to eliminate mass spectrum interferences. Results The linear standard curves were obtained with the correlation coefficient above 0.9992. The detection limit of the method was 0.003~0.028 μg/L, and the relative standard deviation was less than 4.92%. The recovery rates were 85.6%~106.2%．The experimental results of standard reference materials were in good agreement with the certified values. Conclusion The method is simple, fast, and sensitive, and it is suitable for accurate quantitative analysis of heavy metals in seaweed foods.