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氯化钙底液极谱法测定铅是应用最广泛的一种方法,但是对于铁矿、闪锌矿中铅的测定仍有一定困难,主要是铅含量大小不等,有中、低含量,也有微量,该取多少试样测定,往往难以掌握,必须经过光谱半定量或者测定一遍后再根据情况测定,费时又耗力;加之铁量高,试样取多,在溶解蒸干时操作不便。我们拟定了氯化钠、碘化钾底液连续测铅的方法,从而克服上述困难。仪器:JP-1A型示波极谱仪。三电极,银片为参比电极。试剂:氯化钙-盐酸羟胺混合溶液:每升中含250克无水氯化钙、10克盐酸羟胺(必要时过滤)。铅标准溶液:0.01mg ml~(-1)2%盐酸溶液(V/V);
Determination of lead by calcium chloride bottom polarography is the most widely used method, but for iron ore, determination of lead in sphalerite is still some difficulties, mainly ranging from lead content, with medium and low content, There are traces, the number of samples taken to measure, often difficult to grasp, you must go through the spectrum of semi-quantitative or measured again after the determination according to the situation, time-consuming and labor-intensive; coupled with high iron content, the sample to take more, . We developed a sodium chloride, potassium iodide solution continuous measurement of lead, thus overcoming these difficulties. Instrument: JP-1A oscilloscope. Three electrodes, silver as the reference electrode. Reagents: Calcium chloride - hydroxylamine hydrochloride mixed solution: containing 250 grams of anhydrous calcium chloride per liter, 10 grams of hydroxylamine hydrochloride (if necessary, filtered). Lead standard solution: 0.01mg ml ~ (-1) 2% hydrochloric acid solution (V / V);