采用微波消解技术对样品进行前处理,以74Ge、115In、209Bi、45Sc为内标元素消除非质谱干扰,以氦气为碰撞反应气消除质谱干扰,建立了电感耦合等离子体质谱法同时测定甘蔗中重金属元素铅、镉、砷、铊、钒、铬、锡、钴和镍的方法。在优化的试验条件下,方法的线性范围为0.04~50 μg·L-1,相关系数均大于0.999,铅、镉、砷、铊、钒、铬、锡、钴和镍的检出限(3s)分别为5.7,0.11,0.67,0.067,2.8,1.1,3.1,6.2,4.3 ng·L-1。方法用于分析标准物质,测定结果与认定值相符。

A novel method was established to measure of heavy metals such as Pb, Cd, As, Tl, V, Cr, Sn, Co and Ni in sugarcane by ICP-MS with microwave digestion for sample preparation. 72Ge, 115In, 209Bi and 45Sc were used as the internal standard elements to eliminate non-spectroscopic interference and helium was used as collision gas to eliminate mass spectroscopic interference. Under optimized conditions, the linear range of this method was 0.04-50 μg·L-1 with correlation coefficients over 0.999. The detection limits for Pb, Cd, As, Tl, V, Cr, Sn, Co and Ni were 5.7, 0.11, 0.67, 0.067, 2.8, 1.1, 3.1, 6.2, 4.3 ng·L-1, respectively. The method was used to analyze standard substances, giving results consistent with the certified values.