离子交换吸附-原子吸收光谱法测定粗铜中微量金的研究

Study on Determination of Trace Gold in Crude Copper by Ion-exchangeAdsorption-atomic Absorption Spectrometry

文章研究了离子交换吸附-原子吸收光谱法测定粗铜中的微量金。粗铜样品首先通过高温焙烧除去杂质,再用王水分解,使金转变成络阴离子,经阴离子交换树脂吸附后,金被树脂富集,最后将树脂灰化、溶解后导入原子吸收光谱仪中进行测定。通过方法学实验表明,在0~10.0μg/mL的浓度范围内,金呈现良好的线性关系,相关系数R^(2)=0.9998,方法的检出限为0.2 g/t,回收率和精密度的范围分别是0.58%~2.22%和97.4%~107.3%。该方法与传统的火试金法相比较,两者测得的结果在允差范围之内,证明该方法能够满足粗铜中微量金的测定。

The determination of trace gold in crude copper by ion exchange adsorption atomic absorption spectrometry has been studied.The crude copper sample was f irst roasted at high temperature to remove impurities,and then decomposed with aqua regia to transform gold into complex anions.After adsorption by anion exchange resin,gold was enriched by resin.Finally,the resin was cinded and dissolved and then imported into atomic absorption spectrometer for determination.The results showed that the correlation coeff icient R^(2) was 0.9998 in the range of 0-10.0μg/mL.The detection limit was 0.2 g/t.The recovery and precision of the method were 0.58%-2.22%and 97.4%-107.3%,respectively.Compared with traditional f ire assay,the results obtained by the method are within the tolerance range,which proves that the method can satisfy the determination of trace gold in crude copper.