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叙述了高铑和高铱冶金物料中微量铜的分光光度测定方法。在pH3—10的介质中,铜(Ⅰ)与新亚铜灵生成黄色络合物。该络合物可被三氯甲烷定量萃取。萃合物在454nm处有最大吸收。铜量在0—2微克/毫升范围内遵守比尔定律。采用二异戊基硫醚萃取分离或硫脲掩蔽法以消除金(4mg)或钯(4mg)的干扰后测得的结果基本一致,本文选用硫脲作为掩蔽剂。在选定条件下,10毫克铑或10毫克铱的冶金物料中,分别共存0.2毫克铁、镍、铂对5微克铜的测定无干扰,此量时相对误差不大于±10％。
The method for the determination of trace copper in high rhodium and high-iridium metallurgy materials is described. In the pH 3-10 medium, copper (Ⅰ) with the new cupramate yellow complex. The complex can be quantitatively extracted with trichloromethane. The extract has a maximum absorption at 454 nm. Beer’s law is obeyed in the range of 0-2 μg / ml. Using diisopentyl sulfide extraction or thiourea masking method to eliminate the gold (4mg) or palladium (4mg) interference measured results are basically consistent, the choice of thiourea as masking agent. In the selected conditions, 10 mg of rhodium or 10 mg of iridium metallurgical materials, respectively, coexistence of 0.2 mg of iron, nickel, platinum on the determination of 5 micrograms of copper without interference, the relative error of not more than ± 10%.