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极谱法测定矿石中镉、锌时,应用较广的是氯化铵的氨性底液,资料介绍用盐酸-磷酸底液测定矿石中铜、铅、锌、镉,干扰元素较少,但这些方法灵敏度不能满足地质研究的要求;本试验在磷酸介质中有碘化钾存在下,镉产生吸附催化电流,使灵敏度提高了几十倍。铁的影响可用抗坏血酸消除,铜波在镉波之前,但加入碘化钾后即消失,铅波于镉波前-0.2V处,可用硫酸冒烟分离。本法检出限是镉0.02μg/ml、锌0.08μg/ml。
Polarographic determination of cadmium and zinc in ores, the more widely used ammonium chloride is the ammoniacal bottom liquid, the introduction of information with hydrochloric acid - phosphoric acid in the determination of the ore of copper, lead, zinc, cadmium, the interference element less The sensitivity of these methods can not meet the requirements of geological research; In this experiment, potassium iodide in the presence of phosphoric acid in the presence of catalytic current catalytic adsorption of cadmium, the sensitivity increased by several times. The effect of iron available ascorbic acid elimination, copper wave before the cadmium wave, but disappeared after adding potassium iodide, lead wave in the cadmium wave front -0.2V, available sulfuric acid smoke separation. The detection limit of this law is cadmium 0.02μg / ml, zinc 0.08μg / ml.