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原子吸收法测定矿石中金是比较常见的分析方法。但在试样中含有大量可溶硅,由于采用王水分解,在溶液中易出现大量硅酸沉淀.对金的测定造成困难。本文利用在溶样时稀释试液体积,用有机溶剂萃取溴化金的办法使金与其它元素很好分离,方法的再现性较好;溶液中含有大量铁、铝、钙、镁、铜、铅、锌等干扰元素。经萃取后不干扰金的测定;大量硅酸沉淀对金的测定有影响,但将溶液体积稀释后即使含有大量硅酸沉淀,对金的吸附也很少,不干扰测定。方法适用于含0.10克/吨以上金的矿石分析。主要试剂与仪器王水(1+1):新鲜配制;金标准溶液:1毫升含100微克金;WFX-10型原子吸收分光光度计。波长2428(?);狭缝宽度0.2mm;
Determination of gold in ore by atomic absorption method is more common analytical methods. However, the sample contains a large amount of soluble silicon, due to the decomposition of aqua regia, a large amount of silicic acid precipitates easily in the solution, which makes the determination of gold difficult. In this paper, the volume of the test solution is diluted by dissolving the sample and the gold is extracted by the organic solvent to separate the gold and other elements well. The method has good reproducibility. The solution contains large amounts of iron, aluminum, calcium, magnesium, copper, Lead, zinc and other interference elements. After extraction, it does not interfere with the determination of gold; a large amount of silicic acid precipitation has an impact on the determination of gold, but even if a large amount of silicic acid precipitates after solution volume dilution, the adsorption to gold is very little and does not interfere with the determination. The method is suitable for ore analysis with over 0.10 g / t gold. Main reagents and equipment Aqua regia (1 + 1): freshly prepared; gold standard solution: 1 ml containing 100 micrograms of gold; WFX-10 atomic absorption spectrophotometer. Wavelength 2428 (?); Slit width 0.2mm;