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本文提出了硫代米蚩酮液珠萃取比色测定痕量金的新方法。研究表明:在pH3.3乙酸缓冲溶液中,金与硫代米蚩酮形成的有色络合物能够被TBP的液珠萃取,根据所形成的液珠的颜色进行比色测定。采用封闭溶样技术,泡沫塑料富集分离,硫脲解脱,拟定了快速测定化探样品中痕量金的方法。该法简单快速,灵敏度高,取样15g,检测限为0.5ppb。经样品验证,结果满意。
In this paper, a new method for the determination of trace gold with thio-Michntaxer beads by liquid-bead extraction is proposed. The results show that the color complex of gold and thiomoketone in pH3.3 acetate buffer solution can be extracted by the bead of TBP, and the colorimetric determination of the color of the formed bead is made. The method of closed sample-dissolving, enrichment of foam and separation of thiourea and the determination of trace gold in geochemical exploration samples were developed. The method is simple and fast, high sensitivity, sampling 15g, detection limit of 0.5ppb. After sample verification, the results are satisfactory.