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本文研究了岩样的分解及其痕量金的定量分离,提出了用混合酸分解样品,硫脲型螯合树脂选择性地分离痕量金的中子活化分析法。将堆中子辐照后的样品用氢氟酸除硅,高氯酸分解铬铁矿、硫化矿等难熔物,稀王水溶解残渣,得到的溶液体积小而清亮。这就避免了单纯用王水浸取时产生大量沉淀的情况,避免了大体积沉淀过滤、洗涤等麻烦操作,同时保证了样品分解完全。痕量金的分离采用国内试制的硫脲型螯合树脂,样品溶液经φ3×30mm树脂柱一次分离,金即可以选择性地定量回收。吸附了金的树脂直接于Ge(Li)γ谱仪测量~(198)Au的特征γ射线,方法简便、灵敏度高。
In this paper, the decomposition of rock samples and the quantitative separation of trace gold were studied. A neutron activation analysis method for the selective separation of trace gold by mixed acid decomposition samples and thiourea-type chelating resins was proposed. The heap neutron irradiated samples with hydrofluoric acid in addition to silicon, perchlorate decomposition of chromite, sulfide minerals such as refractory, dilute aqua regia residue, the resulting solution small and clear. This avoids the use of aqua regia when a large number of precipitated precipitation, to avoid the bulk sedimentation filtration, washing and other troublesome operation, while ensuring the complete decomposition of the sample. The separation of trace gold using the domestic trial of thiourea-type chelating resin, the sample solution by φ3 × 30mm resin column once, the gold that can be selectively quantitative recovery. Adsorption of gold resin directly on the Ge (Li) γ spectrometer ~ (198) Au characteristic gamma ray, the method is simple and high sensitivity.