醋酸丁酯富集碘量法快速测定金

来源期刊：中南大学学报(自然科学版)2003年第2期

论文作者：朱丽琴 李幼民

文章页码：156 - 157

关键词：醋酸丁酯;碘量法;金;富集;分离

Key words：butyl acetate; iodimetry; gold; enriching; separation

摘    要：研究了金的富集分离方法,其方法是:通过条件实验,采用醋酸丁酯富集金,分离了干扰元素,并用碘量法定量测定金,解决了含量为ω(Au)≥1×10^-6的金矿石的快速定量测试问题.通过实验,选择了最佳工作条件:50%的溴化钾用量为1 mL,萃取时的相比为1∶4,酸度为20%;保护剂为20%的氯化钠,其用量为1 mL.此外,并对标准物质和样品进行测定.研究结果表明:该方法操作简单,流程短,相对标准偏差小于3%.在无原子吸收仪器的小型实验室,运用该法可快速、定量测定金的含量.

Abstract: This paper discusses the method of testing gold in the ores, especially the method of enriching separation. Through the experiment, the authors studied the condition of the butyl acetate enriching gold, separated the interfering element and used the iodimetry to quantitatively determine gold′s content. The conditions include 1 mL 50%KBr, 20% acidity of aqua regia, 1 mL 20%NaCl as protecting reagent. During enriching, volume ratio between water and organic compound should be kept at ratio 1∶4. By quantitative measure rapidly, the gold ore with aboveω(Au)≥10^-6content is solved. The experiment results show that the method is simple and brief. This method can be used in mang laboratories where there arenot atomic spectrophotometer.