论文部分内容阅读
一、前言电热原子吸收光谱法测定贵金属元素的灵敏度虽高,但如有大量基体元素存在时,对直接测定贵金属有显著影响。据Kritsotakis等报道,200倍的Cu、Ph、Cr、Ag等就干扰Pt的测定。1977年,L’vov提出了在石墨管中采用平台技术,使得被测元素原子化在更接近于恒温的条件下进行,从而减小了被测元素所遭受的气相干扰。我们根据日立原子吸收仪的特点,自行设计并用全热解石墨材料制造了一种弧形小平台,研究了用小平台及常规管壁法(简称管壁法)测定Pt和Rh时,二十多种共存元素对测定所产生的影响。试验结果表明,采用该平台技术以后,共存元素的干扰受到很大的抑制,共存元素的最大允许最较管壁法有很大的提高。
I. Introduction Electrothermal atomic absorption spectrometry for the determination of the sensitivity of precious metals is high, but the presence of a large amount of matrix elements has a significant impact on the direct determination of precious metals. According to Kritsotakis and other reports, 200 times the Cu, Ph, Cr, Ag, etc. interfere with the determination of Pt. In 1977, L’vov proposed the use of platform technology in graphite tubes, allowing the atomization of the element to be tested at a much closer to constant temperature, thereby reducing the gas phase interference suffered by the element under test. According to the characteristics of Hitachi Atomic Absorption Spectrometer, we design and manufacture an arc-shaped small platform by using pyrolytic graphite material. When we study Pt and Rh by small platform and conventional pipe wall method, The impact of multiple coexisting elements on the assay. The experimental results show that the interference of co-existing elements is greatly inhibited after the platform technology is adopted, and the maximum allowable co-existence of elements is greatly improved compared with the pipe wall method.