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随着地球化学找矿的进展,要求测定硅酸盐岩石中痕量的金。目前在分光光度测定金的方法中唯硫代米蚩酮法最为灵敏。在实践中发现,于硝酸介质中用甲基异丁酮(MIBK)萃取,硫代米蚩酮(TMK)显色具有更高的灵敏度,测定下限可达0.02微克金。磷酸三丁酯(TBP)-盐酸体系、聚四氟乙烯作载体的萃取色层法是分离、富集微量金既有效、又简便的方法。亚硫酸钠溶液极易将金从色层柱上淋洗下来,经硝酸煮沸后即可萃取比色。本法将
As geochemical prospecting progresses, the determination of trace amounts of gold in silicate rocks is required. In the method of spectrophotometric determination of gold, thiosulfate is the most sensitive method. In practice it has been found that the extraction of methyl isobutyl ketone (MIBK) in nitric acid medium has the advantage of higher sensitivity for the color development of thiomorpholone (TMK) with a lower limit of determination of up to 0.02 microgram gold. Tributyl phosphate (TBP) - hydrochloric acid system, polytetrafluoroethylene as a carrier extraction chromatography is the separation, enrichment of trace gold is an effective and simple method. Sodium sulfite solution is easy to gold from chromatography column rinsed down, nitric acid can be extracted after boiling color. This Law will be