碱性体系-蒸汽发生-原子荧光光谱法测定地质样品中的锌

Determination of Zinc in Geological Samples by Steam Generation-Atomic Fluorescence Spectrometry with Alkaline System

研究了原子荧光光谱法测定锌的新体系,针对基体较为复杂的样品,建立了碱性体系-蒸汽发生-原子荧光光谱法测定锌的方法。优化了碱性体系锌蒸汽发生的实验条件及仪器测定的参数,加入镍离子作增敏剂,增强了荧光信号,方法检出限为0.24μg/L,精密度RSD（n=6）小于4.0%,锌的标准曲线线性范围为0.5-800.0μg/L。与传统的酸性体系相比,碱性体系具有更高的灵敏度和更宽的线性范围,并且可以大幅度降低共存元素的干扰。方法应用于国家一级标准物质中锌的分析,测定值与标准值基本吻合,加标回收率为94.1%-101.2%。

A method for the determination of zinc,especially in complicated geological samples,by hydride generation atomic fluorescence spectrometry with alkaline system was established.Operation conditions for steam generation from alkaline solution and instrument parameters were investigated and optimized.Adding nickel ion enhanced zinc signals obviously.Under the optimized condition the detection limit of the method for zinc was 0.24 μg/L with dynamic linear range of 0.5~800 μg/L.In comparison with traditional acid system,new system provides higher sensitivity,wider linearity and less interference from coexistent elements.The method has been applied to the determination of zinc in national geological standard samples with satisfactory results.The recoveries of the method are 94.1%~ 101.2% with precision of less than 4.0%RSD（n=6）.