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氧化钴是硬质合金的原料,钠、钙、镁对合金性质影响很大,为消除钴及杂质元素对测定的干扰,常用离子交换和汞阴极电解法分离,其手续长,耗汞大,空白不够稳定。光谱法需高分辨率仪器。本文用石墨和铂网电极分离钴和杂质元素后,用空气-乙炔焰,火焰分光光度法测定钠,原子吸收法测定钙和镁,测定下限分别为0.0010％、0.0020％和0.00030％、方法快速准确。
Cobalt oxide is the raw material of cemented carbide. Sodium, calcium and magnesium have a great influence on the properties of the alloy. In order to eliminate the interference of cobalt and impurity elements on the determination, commonly used ion exchange and mercury cathodic electrolysis separation, Blank is not stable enough. Spectroscopy requires high-resolution instruments. In this paper, graphite and platinum mesh electrode separation of cobalt and impurity elements, the air - acetylene flame, flame spectrophotometric determination of sodium, atomic absorption method for the determination of calcium and magnesium, determination of the limits were 0.0010%, 0.0020% and 0.00030%, the method fast accurate.