A catalytic spectrophotometric method based on the catalytic effect of Pt(Ⅳ) on the oxidation of 2-(4-chloroe-2-phosphonophenylazo)-7-(4-acetylphenlazo)-1, 8-dihydroxy-3, 6-naphthalenedisulfonicacid(chlorophosphonazo...A catalytic spectrophotometric method based on the catalytic effect of Pt(Ⅳ) on the oxidation of 2-(4-chloroe-2-phosphonophenylazo)-7-(4-acetylphenlazo)-1, 8-dihydroxy-3, 6-naphthalenedisulfonicacid(chlorophosphonazo-pA) with KIO 4 in acidic medium has been proposed for the determination of trace platinum. The reaction is performed directly in an aqueous solution and the optimal conditions are given. The detection limit is 5.0×10 -8 g/mL. The Beer′s law is obeyed in the range of 1.5×10 -7～3.0×10 -7 g/mL. The method has been applied to the determination of platinum in Pt-Pd ores with satisfactory results.展开更多
对水中亚硝酸盐测定的溴酸钾-亚甲蓝催化分光光度法进行了研究.通过单因素实验和正交实验,得出测定的最佳条件为:向比色管中加入3 mL H3PO4、3.5 mL亚甲蓝、4.0mL KB rO3溶液,置于40℃水浴中加热3 m in.取出后先加入1 mL乙酸钠中止反应...对水中亚硝酸盐测定的溴酸钾-亚甲蓝催化分光光度法进行了研究.通过单因素实验和正交实验,得出测定的最佳条件为:向比色管中加入3 mL H3PO4、3.5 mL亚甲蓝、4.0mL KB rO3溶液,置于40℃水浴中加热3 m in.取出后先加入1 mL乙酸钠中止反应,然后冷却至室温,在波长678 nm处测量吸光度.该法的测定范围为0.1-4.0 mg/mL.展开更多
文摘A catalytic spectrophotometric method based on the catalytic effect of Pt(Ⅳ) on the oxidation of 2-(4-chloroe-2-phosphonophenylazo)-7-(4-acetylphenlazo)-1, 8-dihydroxy-3, 6-naphthalenedisulfonicacid(chlorophosphonazo-pA) with KIO 4 in acidic medium has been proposed for the determination of trace platinum. The reaction is performed directly in an aqueous solution and the optimal conditions are given. The detection limit is 5.0×10 -8 g/mL. The Beer′s law is obeyed in the range of 1.5×10 -7～3.0×10 -7 g/mL. The method has been applied to the determination of platinum in Pt-Pd ores with satisfactory results.
