封闭溶样火焰原子吸收法测定焙烧红矿中的银

Enclosed sample-dissolving and flame atomic absorption for silver determination in the firing red ores

探讨在焙烧红矿中测定Ag偏低的机理,并拟定火焰原子吸收法测定Ag的流程。选用HCl+HF对焙烧红矿进行预处理可以使Fe2O3等氧化物包裹的Ag暴露,并将焙烧时形成的硅酸银破坏。以王水 封闭溶样法可使矿样分解完全,在10%王水介质中,采用火焰原子吸收法测定Ag的吸收信号,方法的检出限为1×10-6,相对标准偏差为6 5%。

The paper discusses the mechanism of low Ag determined in the firing red ores, and draws up a process of Ag determination using flame atomic absorption. The preprocessing to the firing red ores by using HCl+HF can helps to reveal Ag from envelop of Fe2O3 and destroy silicicAg that was formed during firing. The aqua regiaenclosed dissolving method can completely decompose the ore samples. In 10% aqua medium, taking flame atomic absorption to determine Ag absorption sign, the detection limit is 1×10-6, relative error is 65%.