电感耦合等离子体原子发射光谱法(ICP-AES)测定矿样中痕量金

建立了电感耦合等离子体原子发射光谱法(ICP-AES)测定低品位金矿样品中痕量金的方法,优化了仪器分析条件,对测定介质、干扰等进行了系统研究,结果标明:在小于10%(φ)王水介质中,所用酸不影响测定;矿中常见的阳离子的干扰,通过用10%盐酸(φ)进行预溶解去除,残留的基体元素对测定没有影响。试样中存在的硅对金208.2nm产生严重的光谱干扰,用硅的251.6nm线进行干扰系数法校正。采用上述条件测定了高硫尾矿中的痕量金,结果与活性炭富集-原子吸收法所得结果一致。在实验条件下,对金矿的检测限为0.10g·t-1。

Determination of Trace Au in Mine Sample by Inductively Coupled Plasma Atomic Emission Spectroscopy

A method for the determination of trace gold by inductively coupled plasma atomic emission spectrometry(ICP-AES)in mine sample was proposed.The instrument parameters were optimized and the media of solution and interferences were studied systemically.The results showed that in less than 10%(ψ)aqua regia medium,the acids had no influences on the determination.and after removing common cations in mineral samples by using 10% hydlrochloric acid(ψ),the residual matrix elements had no effect on the determination of Au with ICP-AES.The silicon in samples had serious spectral interference to Au 208.2 nm,and the spectral interference was corrected with interference coefficient using the 251.6 nm silicon linc.With 10% HCl to remove the matrix and imerference correction coefficient to eliminate the interference of silicon,trace gold in high-sulfur tailings samples was determined,the result was identical with the reference values by the method of enrichment with activated carbon-atomic absorption spectrometry.Under the experimental conditions,the detection limit for gold in mine sample was 0.10 g·t-1.