电感耦合等离子体质谱法测定铝色淀中16种重金属元素

Determination of Sixteen Heavy Metals in Aluminium Lakes by Octopole Reaction System Inductively Coupled Plasma Mass Spectrometry

建立用带八极杆碰撞/反应池的电感耦合等离子体质谱仪(ORS-ICP-MS)测定食品添加剂铝色素中V、Cr、Mn、Fe、Co、Ni、Cu、Zn、As、Ag、Cd、Sn、Sb、Ba、Hg、Pb 16种重金属元素的分析方法。样品用盐酸+硝酸分解后,试液直接用ORS-ICP-MS法测定16种重金属元素。采用ORS,在池内引入惰性气体氦气或氢气,有效地消除了多原子离子对待测元素的干扰,确定实验的最佳测定条件。结果表明:各元素的检出限在0.016～1.124μg/L之间,加标回收率在90.6%～106.6%之间,相对标准偏差(RSD)小于3.79%。

An analytical method for the simultaneous determination of 16 heavy metals （V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Ag, Cd, Sn, Sb, Ba, Hg and Pb） in aluminium lakes was established using octopole reaction system inductively coupled plasma mass spectrometry （ORS-ICP-MS）. Samples were digested by both HC1 and HNO3 followed by dilution with ultrapure water before ORS-ICP-MS analysis. The interference of polyatomic ions was effectively eliminated by introducing hydrogen or helium into the ORS cell. The optimum experimental conditions were established. The method was shown to be very sensitive with limits of quantification in the range of 0.016-1.124 μg/L for all the investigated metals, their average spike recoveries ranged from 90.6% to 106.6% with relative standard deviations （RSDs） less than 3.79%.