低功率微波等离子体炬原子发射光谱法的研究——超声雾化进样测定金、银、铂、铑、钯

Determination of Gold, Silver, Platinum, Rhodium and Palladium by Low-powered Microwave Plasma Torch Atomic Emission Spectrometry Using an Ultrasonic Nebulizer

本文提出一种测定贵金属元素的微波等离子体炬原子发射光谱法(MPTAES)。采用自制的超声雾化微量进样装置进样,以氩气为工作气体,探讨了观察高度,微波功率、体系介质、氩气流量和共存元素对被测元素发射信号的影响。选用合适的分析线和MPT光源的工作参数,其方法的检出限分别为5.8(Au)、0.5(Ag)、12(Pt)、1.6(Rh)和t 1.0ng/ml(Pd)。实际样品中金和银的测定结果是令人满意的。

A method for the determination of noble metal by microwave plasma torch (MPT) atomic emission spectrometry was investigated. Aqueous samples were introduced with an ultrasonic nebulizer and a desolva-tion system. When Ar was used as support gas, the effect of microwave power, observation height, concentration of acids, flow rate of carrier gas and concomitant element on the emission intensity of noble metal was examined. The detection limits for Au , Ag, Pt. Rh and Pd were 5.8,0. 5,12,1. 6 and 1.0ng/ml, respectively. The method has been applied to the determination of Au and Ag in actual samples with satisfactory results.