Cr(Ⅵ)与对氨基二甲基苯胺氧化显色反应的研究及其应用  

STUDY ON THE OXIDATION COLOUR REACTION OF CHROMIUM(Ⅵ) WITH p-AMINO-N, N-DIMETHYLANILINE AND ITS APPLICATION

作　　者：黄兰芳[1] 何跃武[1] 汪炳武[2] 

机构地区：[1]湖南医科大学化学教研室,长沙410078 [2]长春应用化学研究所

出　　处：《理化检验（化学分册）》1999年第4期170-171,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：试验了Cr(Ⅵ)与对氨基二甲基苯胺氧化显色反应的条件。试验结果表明,Cr(Ⅵ)与对氨基二甲基苯胺反应形成的红色产物在554nm处有最大吸收,表观摩尔吸收系数为3.4×10~4L·mol^(-1)·cm^(-1),线性范围为0～1.6μg·ml^(-1)。采用全差示光度法测定脱脂奶粉中的总铬,用于某脱脂奶粉中0.23mg·kg^(-1)的铬测定时,相对标准偏差为3.7％(n=6)。测定结果与AAS法相比令人满意。The oxidation color reaction of Cr(VI) with p-amino-N, N-dimethylaniline was studied and reported in this paper. It is found that Cr( VI ) reacts with the above mentioned reagent to form a red oxidized product in the presence of alcohol. Its apparent molar absorptivity is 3. 4×10~4L ·mol^(-1) ·cm^(-1) at 554nm. Beer's law is obeyed in the range of Cr( VI ) 0~1. 6μg ·ml^(-1). The proposed method has been used for the determination of Cr in defatted milk powder by completely differential spectrophotometric method. The analytical results indicate a precision of 3. 7% (n = 6) for the determination of 0. 23mg ·kg^(-1) Cr. The results obtained are in good agreement with those of AAS method.

关 键 词：铬 对氨基二甲基 苯胺 全差示光度法 显色反应 

分 类 号：O614.611[理学—无机化学]