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钼在硫酸—苦杏仁酸—氯化钾溶液中能产生一个灵敏度很高(1×10~(-10))的单峰极谱催化波,催化波大小与钼的浓度有很好的线性关系。方法干扰元素少,适用于土壤、煤、煤灰中微量钼的测定。干扰元素影响如下,在含有0.5μg钼的50ml测定液中,硅、铝、铜、铅、锌、铬、钒等无干扰,大于20倍的钨、锡对测定有影响。试样处理:称取0.5000g试样于高铝坩埚中,加过氧化钠3～4g.搅拌均匀并复盖一层,置于700℃高温炉中熔融15min取出冷却,热水浸取,于电热板上加热煮沸,冷却后移入100ml量瓶中,稀至刻度摇匀。
Molybdenum in sulfuric acid - mandelic acid - potassium chloride solution can produce a very high sensitivity (1 × 10 ~ (-10)) single peak polarographic catalytic wave, the catalytic wave size and molybdenum concentration has a good linear relationship . The method has fewer interference elements and is suitable for the determination of trace molybdenum in soil, coal and coal ash. The interfering elements have the following effects: In 50 ml of measurement solution containing 0.5 μg of molybdenum, silicon, aluminum, copper, lead, zinc, chromium, vanadium and the like are free from interference and more than 20 times of tungsten and tin affect the measurement. Sample processing: Weigh 0.5000g sample in high alumina crucible, add sodium oxide 3 ~ 4g. Mix well and cover a layer, placed in a high temperature furnace 700 ℃ melting 15min remove the cooling, hot water leaching, at Heating on the hot boil, cooled into the 100ml volumetric flask, dilute to the mark shake.