【摘要】 利用带八极杆碰撞/反应池(ORS)和屏蔽炬技术的电感耦合等离子体质谱(ICP-MS)直接测定食品塑料袋中Cr、Mn、Ni、Cu、Zn、As、Cd、Sn、Sb、Pb等多种重金属元素的溶出量。通过向碰撞池中引入氢气和氦气消除多元素分子离子的干扰,以50μg/L的Ge、In、Tb为内标元素校正基体干扰和漂移。该方法对10种待测元素的检出限在0.003～0.153μg/L之间,相对标准偏差在0.70%～2.51%之间,样品的加标回收率在90.0%～106.0%之间,该方法简便,快速,结果准确可信。更多还原

【Abstract】 An inductively coupled plasma mass spectrometry(ICP-MS)with an octopole reaction/ollision cell and shield torch system was employed for the simultaneous determination of released heavy metal elements in food plastic bag.The elements of Cr,Mn,Ni,Cu,Zn,As,Cd,Sn,Sb and Pb were determined by introducing the hydrogen gas or helium gas into the reaction/collision cell to eliminate the interference of multi-element molecules and ions.Ge,In and Tb were used to correct the matrix interference and drift.Under the optimal conditions,the detection limits of the 10 elements were in the range of 0.003 ～ 0.153μg/L with the relative standard deviation(RSD)0.70% ～ 2.51%,and the recovery of the samples was in the range of 90.0% ～ 106.0%.The method is easy,rapid and accuracy.更多还原