摘要
在ｐＨ５．１的ＨＡｃ－ＮａＡｃ介质中，铑（Ⅲ）催化高碘酸钾氧化偶氮胂Ⅲ褪色，据此建立了一个以偶氮胂Ⅲ褪色反应为基础的新催化动力学测定铑的方法。铑（Ⅲ）浓度在０．４～４．０μｇ／２５ｍＬ范围与ｌｏｇ（Ａ０／Ａ）有线性关系（ｒ＝０．９９８９，ｙ＝０．２７１０ｘ－０．０６５３），检出限为１．５×１０－１０ｇ／ｍＬ。方法用于实际样品中铑的测定，对８份试液测定的相对标准偏差为０．８％～１．９％，回收率为９８％～１０５％。
In the presence of rhodium, arsenazo can be oxidized by potassium peroidate in HAcNaAc (pH5.1)medium. The new catalytic kinetic method based on the decolorization reaction of arsenazo has been established for the determination of trace rhodium. Rhodium concentration and log (A0/A) is linearly related over the concentration range of 0.44.0 g/25mL (r=0.9989, y=0.2710x-0.0653). The detection limit is 1.510-10g/mL. The method has been used to determine trace rhodium in actual samples. The relative standard deviations obtained from 8 samples solution were 0.81.9% and the recoveries were in the range of 97.8%104.9%.
出处
《分析科学学报》
CAS
CSCD
1999年第2期107-110,共4页
Journal of Analytical Science
