采用电感耦合等离子体质谱法测定食用香精样品中砷、铬、铜、锰、硒、铅、汞、镉和钴等9种金属元素。通过完善微波消解前处理条件,优化仪器参数,结合使用八极杆碰撞/反应池技术和氦模式技术,有效地消除了多原子离子干扰。各测定元素的线性范围在10 μg·L-1以内,相关系数均在0.995以上,检出限(3s)在0.000 6~0.016 μg·L-1之间。加标回收率在90.0%~114%之间,测定值的相对标准偏差(n=6)小于5%。方法用于分析标准物质,测定值与认定值相符。

A method of ICP-MS with octopole reaction system (ORS) was used for determination of As, Cr, Cu, Mn, Se, Pb, Hg, Cd and Co in food flavour. The pretreatment conditions were improved and the instrument operating parameters were optimized. The interference of polyatomic ions was effectively eliminated by using ORS combined with helium pattern technology. The linear ranges of the elements was within 10 μg·L-1, correlation coefficients over 0.995.The detection limits (3s) were in the range of 0.000 6-0.016 μg·L-1. Recovery rates measured by standard addition method were in the range of 90.0%-114%, with RSD (n=6) were less than 5%. The method was used to analyze standard substances, giving results consistent with the certified values.