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在硫酸和热水浴中 ,Rh(Ⅲ )催化高碘酸钾氧化偶氮胭脂红B褪色 ,由此建立了测定铑的新催化光度法 .铑质量浓度在 0～ 1 1μg/2 5mL范围内符合比尔定律 ,检出限为 4 0 8× 10 - 9g/mL .对 1 0 μg/2 5mLRh(Ⅲ )测定的相对标准偏差为 2 2 0 % (n =11) .催化反应的表观活化能为 10 0 38 KJ/mol.考察了 4 0多种共存离子的影响 ,Os(IV)、Ru(Ⅲ )和Ir(IV)干扰 ,其它贵金属、有色金属和铁不干扰 .题示体系已用于某些催化剂和冶金产品中痕量铑的测定 ,结果满意 .
Rhodium catalyzed oxidation of azocarmine B by potassium periodate in sulfuric acid and hot water bath, and a new catalytic spectrophotometry was established for the determination of rhodium.The rhodium concentration was in the range of 0 ~ 1 1μg / 2 5mL The Beer’s Law was obeyed, with a detection limit of 40 8 × 10 -9 g / mL, with a relative standard deviation of 220% (n = 11) for the 10 μg / 2 5 mL Rh (Ⅲ) assay. The effect of more than 40 kinds of coexisting ions, interference of Os (IV), Ru (III) and Ir (IV), and other noble metals, nonferrous metals and iron can be observed. For some catalysts and metallurgical products in the determination of trace rhodium, with satisfactory results.