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目前,铂族元素的测定以比色法为多,用极谱法测定贵金属的报导不甚多。国内曾报导利用催化极谱测定矿石中微量铱的方法,但铑的允许量只为铱的20倍,大干20倍的铑就必须采用分离手续。由于在常温下,铂、钯、铑、金与快热粉,二氯化锡生成三元络合物,并易被萃入氯仿,而铱则需在加热条件下才能生成三元络合物,因此利用温度的差异可使铱与铂、钯、铑、金进行分离,本文将萃取分离与差示极谱法结合,可在铂、钯、铑、金中进行超微量铱的测定。铱的工作曲线:在25ml分液漏斗中各加入6ml
At present, the determination of platinum group elements by colorimetric method for the determination of precious metals by polarography is not much reported. China has reported the use of catalytic determination of trace ores of iridium ore method, but the allowable amount of rhodium is only 20 times the iridium, rhodium must be 20 times the dry separation procedures. Because at room temperature, platinum, palladium, rhodium, gold and quick heat powder, tin dichloride generated ternary complex, and is easy to be extracted into chloroform, and iridium need to be heated under ternary complex Therefore, the difference of temperature can be used to separate iridium from platinum, palladium, rhodium and gold. In this paper, the extraction and separation are combined with the differential polarography to determine the trace amounts of iridium in platinum, palladium, rhodium and gold. Iridium work curve: In a 25ml separatory funnel each added 6ml