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本文介绍了一种用原子吸收光谱测定矿石和精矿中钨的简便而快速的方法。用氧化亚氮-乙炔火焰,在400.9nm处测定吸收值。用熔融的硫酸氢钾分解样品。发现,硫酸氢钾是分解钨矿物的一种合适熔剂,也是增强钨的吸收信号,消除许多干扰的一种很强的增强剂。试验了18种元素的干扰情况,发现只有钙,当其浓度大于0.1mg/100ml时会产生严重干扰。通过加入硅酸钠溶液,使Si∶Ca浓度比达到1.5∶1,则可消除Ca的干扰,使吸收信号完全恢复到原来的水平。该方法已用于黑钨矿、白钨矿、黑钨矿-锡石和重矿物砂精矿样品中钨的测定。
This paper presents a simple and rapid method for the determination of tungsten in ores and concentrates by atomic absorption spectrometry. Absorbance was measured at 400.9 nm with a nitrous oxide-acetylene flame. Dissolve the sample with molten potassium hydrogen sulfate. Found that potassium bisulfate is a suitable flux to decompose tungsten minerals, but also to enhance the absorption of tungsten signal, eliminating a lot of interference is a very strong enhancer. The interferences of the 18 elements were tested and found to be calcium alone, with severe interference at concentrations greater than 0.1 mg / 100 ml. By adding sodium silicate solution so that the Si: Ca concentration ratio reaches 1.5: 1, the interference of Ca can be eliminated, so that the absorption signal is fully recovered to the original level. This method has been used for the determination of tungsten in wolframite, scheelite, wolframite-cassiterite and heavy mineral sand concentrate samples.