在氯化钠－磷酸溶液中，铑（Ⅲ）催化高碘酸钾氧化碱性染料（乙基罗丹明Ｂ，丁基罗丹明Ｂ，耐尔蓝）褪色，反应速率与铑浓度呈线性的范围依次为０２～４０，０～４５和０～６０μｇ／２５ｍＬ，检出限依次为２２４×１０－１０，２８４×１０－１０和３８０×１０－１０ｇ／ｍＬ．本催化反应对铑（Ⅲ）或碱性染料均为一级反应．催化反应的表观活化能分别为６５２１，６３４１和６１０１ｋＪ／ｍｏｌ．考察了４０多种共存离子的影响，Ｏｓ，Ｒｕ，Ｉｒ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 In sodium chloride - phosphoric acid solution, rhodium (Ⅲ) catalyzed the discolouration of potassium periodate oxidation of basic dyes (ethylrhodamine B, butyl rhodamine B, Nile Blue). The reaction rate and rhodium concentration ranged linearly Followed by 02 ~ 40, 0 ~ 45 and 0 ~ 6  0μg / 25mL, the detection limits were followed by 224 × 10-10,284 × 10-10 and 380 × 10 -10g / mL. The catalytic reaction of rhodium (Ⅲ) or basic dyes are first-class reaction. The apparent activation energies of the catalytic reactions are 6521, 6341 and 6101 kJ / mol, respectively. The effect of more than 40 kinds of coexisting ions was examined. The interference of Os, Ru, Ir and other noble metals, nonferrous metals and iron did not disturb. The title system has been used in the determination of trace amounts of rhodium in certain catalysts and metallurgical products with satisfactory results