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矿石或尾矿中微量钨的测定已有采用有机溶剂萃取比色分析法。但手续繁琐,周期太长。为了克服这些缺点,提高测定的灵敏度,我们试验应用光谱法来进行测定。由于钨在电弧中出现升华现象,弧烧拖延时间长,尤其在含碳的气氛中,与碳形成难挥发的W_2C或WC。费多洛夫提出:溴和碘的蒸气在任何温度下都不与钨作用。且钨与氯能生成易挥发的氯氧化物。因此,当加入适当的缓冲剂后,使其弧烧时间控制在二分钟左右,钨基本上蒸发完全。同时采用元
Determination of trace amounts of tungsten in ores or tailings has been carried out using organic solvent extraction colorimetric analysis. However, the procedure is complicated and the period is too long. In order to overcome these shortcomings and increase the sensitivity of the assay, we test the application of spectroscopy to determine. Due to the sublimation of tungsten in the arc, arc burning delays for a long time, especially in carbon-containing atmospheres, forming volatile W 2 C or WC with carbon. Fedorov suggested that bromine and iodine vapor do not interact with tungsten at any temperature. And tungsten and chlorine can generate volatile chlorine oxides. Therefore, when an appropriate buffer is added, the arc burning time is controlled at about two minutes, and the tungsten is essentially evaporated completely. At the same time using yuan