混凝土中重金属元素溶出量的质谱分析

Determination of released heavy metal elements in concrete by inductively coupled plasma mass spectrometry

利用带八极杆碰撞/反应池和屏蔽炬技术的电感耦合等离子体质谱直接测定混凝土中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。10种待测元素的检出限为0.001～0.033μg/L,相对标准偏差为0.85%～2.8%,样品的加标回收率在91.1%～103.9%之间。

An inductively coupled plasma mass spectrometry（ICP-MS） with an octopole reaction/collision cell and shield torch system was employed for the simultaneous determination of released heavy metal elements in concrete.The elements 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 are in the range of 0.001～0.033 μg/L with the relative standard deviation（RSDs） 0.85%～2.8%,and the recoveries of the samples were in the range of 91.1%～103.9%.