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金的光度法测定,硫代米蚩酮(TMK)-萃取法的灵敏度较高,但不稳定,同时萃取剂气味难闻。近年采用活性炭分离富集金,加入表面活性剂改善金-硫代米蚩酮反应性能的水相光度法已有报道。本文利用溴代十六烷基吡啶(CPB)对金-硫代米蚩酮(TMK)络合物增溶增敏作用,在pH 3左右的乙酸-乙酸钠缓冲介质中显色,波长550nm处络合物摩尔吸光系数为1.6×10~5,检出限为0.004μg·ml~(-1)。金量在0～20μg·25ml~(-1)符合比耳定律,其稳定性比已报道的更佳。文中用泡沫塑料柱动态分离富集金,拟定了矿石中金的分析方法。
The photometric determination of gold, TMK - extraction method of high sensitivity, but not stable, while the extractant smell unpleasant. In recent years, the use of activated carbon separation and enrichment of gold, adding surfactants to improve the reaction performance of gold - thio Michtan ketone aqueous phase spectrophotometry has been reported. In this paper, the solubilization and sensitization of gold-thio Michler’s ketone (TMK) complexes with cetyl pyridinium bromide (CPB) was studied. The sensitization was performed at pH 3 in acetic acid-sodium acetate buffer medium, The molar absorption coefficient of the complex was 1.6 × 10 ~ 5, the detection limit was 0.004μg · ml ~ (-1). The gold content of 0 ~ 20μg · 25ml -1 conforms to Beer’s law, and its stability is better than that reported. In this paper, foam column dynamic separation of gold enrichment, the proposed method of analysis of gold ore.