meso-四(对-三甲铵基苯基)卟啉与铋显色反应的研究

A Study on the Colour Reaction of Bismuth (Ⅲ) with meso-Tetra (4-Trimethylaminoniumphenyl) Porphyrin

研究了在催化剂苯羟乙酸的存在下,me so-四(对-三甲铵基苯基)卟啉与Bi(Ⅲ)的显色反应。在pH 5.7的HAc-NaAc介质中,于沸水浴中反应5min完成,配合物的最大吸收波长为464mn,表现摩尔吸光系数为3.15×10~5L·mol^(-1)·cm^(-1),Bi(Ⅲ)含量在0～0.48μg/ml范围内呈线性关系,配合物的组成为Bi(Ⅲ):T(4-TAP)P=2:3。方法可用于矿样中痕量Bi的测定。

The colour reaction of meso-tetra(4-trimethylammoniumphenyl) porphyrin [T(4-TMAP)P] with bismuth(Ⅲ) was studied in the presence of phenyhydro-xyacetic acid as catalyst. In pH 5.7 HAc-NaAc medium, the complex formation reaction can be completed by heating at 1001 for 5 min. The complex has a maximum absorption at 464 nm with a molar absorptivity of 3.15#105. Beer's law is obeyed for bismuth(Ⅲ) in the range 0-480 ng/ml. The composition of the complex is Bi:T(4-TMAP)P=2:3. The method has been applied to determining bismuth (Ⅲ) in ores.