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电感耦合等离子体原子荧光光谱仪(ICP-AFS)作为一种灵敏的多元素同时分析的工具为分析工作者所接受。我们利用Baird的仪器用正交法和方差分析法研究了射频功率,观测高度,载气流量及冷却气流量对测定Ag、Cn、Zn、Li、Na、Ca、Sr及Be的影响,考察了用甲烷代替丙烷改善上述元素检出限的效果,HNO_3、HClO_4,H_2SO_4和HCl对待测元素荧光强度的影响以及矿石样品中常见元素Pb、Mg、Fe和Al的干扰,实验结果表明:在载气中加入少量的甲烷,可以使Li、Na、Ca、Sr、Be和Zn的检出限降低30%—200%。在ICP-AFS中某些阴离子对各元素信号强度的影响比ICP-AES严重,虽然通过改变仪器操作参数可以避免大部分基体干扰,但必须加入释放剂La盐才能完全消除Fe、Al对Ca、Sr的干扰。
Inductively Coupled Plasma Atomic Fluorescence Spectrometry (ICP-AFS) is accepted by analysts as a sensitive, multi-element simultaneous analysis tool. We used Baird’s instrument to study the influence of RF power, observed height, carrier gas flow and cooling gas flow on the determination of Ag, Cn, Zn, Li, Na, Ca, Sr and Be using orthogonal and variance analysis methods The effect of HNO_3, HClO_4, H_2SO_4 and HCl on the fluorescence intensity of the element to be measured and the interference of Pb, Mg, Fe and Al, which are common elements in ore samples, with methane instead of propane to improve the detection limit of the above elements. The experimental results show that in the carrier gas Adding a small amount of methane can reduce the detection limits of Li, Na, Ca, Sr, Be and Zn by 30% -200%. The influence of some anions on the signal intensity of ICP-AES is more serious than ICP-AES in ICP-AFS. Although most of the matrix interference can be avoided by changing the operating parameters of the instrument, La salt must be added to completely eliminate Fe and Al, Sr interference.