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本文提出了化学分离富集/电感耦合等离子体—原子发射光谱法(ICP-AES)测定铝合金中痕量稀土和非稀土杂质的方法。该法基于碱溶法分解试样,以浓盐酸从基体中浸取杂质,含有少量基体的富集物用ICP-AES法测定。对以浓盐酸和浓盐酸/乙醇体系分离基体的效率及基体干扰效应进行了考察。在最佳实验条件下,方法的检出限为0.02～0.04μg/ml(对稀土La、Y)和0.006～1.08μg/ml(对Mn、Cr、Cu、Zn、Fe);以Ni为内标,改善了方法的精密度,相对标准偏差为0.7～2.1%;试样分析回收率为92～125%。该方法具有操作简便、准确、基体干扰小和同时测定铝合金中稀土和非稀土杂质的优点。
In this paper, a method for the determination of trace rare earths and non-rare earth impurities in aluminum alloy by chemical separation and enrichment / inductively coupled plasma-atomic emission spectrometry (ICP-AES) is proposed. The method is based on alkaline dissolution decomposition samples, with hydrochloric acid leaching of impurities from the matrix, with a small amount of matrix enrichment by ICP-AES method. The separation of matrix from concentrated hydrochloric acid and concentrated hydrochloric acid / ethanol system was investigated. Under the optimum conditions, the detection limits were 0.02-0.04 μg / ml (for rare earth La, Y) and 0.006-1.08 μg / ml (for Mn, Cr, Cu, Zn, Fe) The accuracy of the method was improved with a relative standard deviation of 0.7-2.1% and a sample recovery of 92-125%. The method has the advantages of simple and accurate operation, small matrix interference and simultaneous determination of rare earth and non-rare earth impurities in the aluminum alloy.