针对锌焙砂酸浸液中高浓度Fe~(3+)和Zn~(2+)对微量In~(3+)的光谱测定存在严重的基体干扰,提出一种铟与锌、铁粗分离,并使铟得以富集的还原-共沉淀前处理方法.用Na_2 SO_3溶液将锌焙砂酸浸液中大量Fe~(3+)还原成Fe~(2+),调节溶液pH值为4.0～4.5,溶液中少量未被还原的Fe~(3+)形成Fe(OH)_3沉淀,In~(3+)也以In(OH)_3形式共沉淀而得到富集,大量Zn~(2+)和Fe~(2+)则留在溶液中.富集铟的滤泥用酸溶解,以原子吸收光谱法测定铟.该方法对铟富集率达到98%以上,锌和铁的去除率分别达到90 %以上,基本满足铟光谱测定的要求.
In view of the serious matrix interference brought high concentration of Fe~(3+) and Zn~(2+) in a-cidic leaching solution of zinc calcine in the spectrometric determination of trace indium, a reduction-co precipitation pre-treatment method was proposed. By this method, indium could be enriched while be-ing roughly separated from Zn and Fe. After most Fe~(3+) was reduced to Fe~(2+) by Na_2 SO_3, the leaching solution was adjusted to pH 4.0-4.5, so that the residual Fe~(3+) was precipitated into Fe(OH)_3 and In~(3+) was enriched in the form of In(OH)_3 through precipitation while Fe~(2+) and Zn~(2+) were left in the liquid solution. The filter mud for enriching indium was dissolved in hydroehloride before atomic ab-sorption spectrometric determination. Through the method, 98 % indium could be enriched while 90 % Zn and Fe could be removed, which basically met the requirements of spectrometric determina-tion.
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