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本文包括三部份:铱的单独测定;铱、铑及铱、铑、铂的同时分光光度测定。后者系取铱、铑、铂混合液一份,在高氯酸介质中,室温下,使铂、铑与溴化亚锡显色(铱不干扰),用双波长法测得铑量,余为铂量,取另一份在加热下使铱、铑、铂与溴化亚锡均显色(加入溴化钠代替高氯酸,既提高测铱灵敏度,又不降低Rh-SnBr_2配合物稳定性),测得三者总量,扣除前面已知铂、铑量得铱量。此法简便(不分离、不解联立方程)可靠。符合比尔定律的浓度范围分别为0—8.0μgIr/mL、0—2.4μgRh/mL和0—20μgPt/mL。至少100微克Fe~(3+)、Co~(2+)、Ni~(2+)、Mn~(2+)、Cd~(2+)、Pb~(2+)、Cu~(2+)和Ge(Ⅳ)不干扰,可用于含Ir(50—200μg)、Rh·(15—60μg)和Pt(150—500μg)的混合物同时测定。
This paper consists of three parts: separate determination of iridium; simultaneous spectrophotometric determination of iridium, rhodium and iridium, rhodium, platinum. The latter is to take a mixture of iridium, rhodium and platinum in perchloric acid medium at room temperature, the color of platinum, rhodium and stannous bromide (iridium does not interfere), measured by dual-wavelength rhodium amount, The remaining amount of platinum, take another under the heating of iridium, rhodium, platinum and stannous bromide are color (adding sodium bromide instead of perchloric acid, both to improve the sensitivity of iridium, without reducing the Rh-SnBr_2 complex Stability), measured the total amount of the three, deducting the previously known platinum, rhodium amount of iridium. This method is simple (not separate, never solve the simultaneous equations) reliable. Beer’s law follows the concentration range of 0-8.0 μgIr / mL, 0-2.4 μgRh / mL and 0-20 μgPt / mL, respectively. At least 100 micrograms of Fe3 +, Co2 +, Ni2 +, Mn2 +, Cd2 +, Pb2 +, Cu2 + ) And Ge (IV) can be used for the simultaneous determination of a mixture containing Ir (50-200 μg), Rh · (15-60 μg) and Pt (150-500 μg).