电弧制样-电感耦合等离子体光谱分析法直接测定合金钢中的痕量元素

Application of Arc Sampling Combined with Inductively Coupled Plasma Atomic Emission Spectrometry to the Determination of Trace Elements in Alloy Steels

本文提出了电弧制样与电感耦合等离子体(ICP)相结合光谱直接测定合金钢中痕量元素的新方法。采用高压/低电流直流电弧放电作为试样蒸发的蒸发源,由于阴极弧斑在金属表面上方作快速均匀的移动,使试样剥离形成金属气溶胶,它在载气流(Ar)的作用下引入ICP。研究了试样的蒸发行为、放电气体介质、基体组成变化的影响及ICP工作参数等。用本法测定Co、Ni、Cr、Mn、Mo、Nb、Ta、Ti、V、W和Zr的检出限为0。x至xμg/g。分析了低、高合金钢试样,结果与NBS标准值吻合。

A sensitive method for the determination of trace elements in alloy steels by using arc sampling combined with ICP-AES has been developed.The d.c.arc discharge as a vaporization device is used to produce metal vapour from sample surface,and then the vapour is introduced to ICP by carrier gas Ar.The behaviour of sample vaporization,the effect of discharge gas and matrix,and TCPexcitation parameters were investigated.The detection limits are in the range of 0.x to xμg/g.The method has been applied to the analysis of some low-alloy and high-alloy steels,and the results obtained are in good agreement with the values of NBS.