ストップドフローシグナルの繰り返し加算によるppbレベルのマンガンと亜鉛の速度論的同時定量

概要

論文の詳細を見る
This method of simultaneous determination of traces of Mn and Zn, based on the difference of the rate of ligand substitution reaction between 1-(2-thiazolyl-azo)-2-naphthol (TAN) chelates and EDTA, is simple and free of interferences from other metal ions and anions. The procedure is as follows; place a sample solution containing (0.04〜2.5)μg of Mn and Zn in a 50cm^3 volumetric flask, add 20 mg of N-(dichio-carboxy)-glycine to mask Cd, Cu and Hg and 2 cm^3 of 2.0 × 10^<-3>mol dm^<-3> TAN solution (10 % Triton X-100), adjust the pH to 8.9 with 5cm^3 of Kolthoff's buffer solution and then dilute to the mark with water. The reaction is initiated by mixing this solution with 2.0 × 10^<-3> mol dm^<-3> EDTA solution (0.4 % Triton X-100, pH 8.9) at 25 ℃ using a stoppedflow apparatus. The reaction is run ten times and the signals of these runs are accumulated to improve the S/N. From the resultant curve Mn and Zn are determined graphically. The method can be applied to the determination of Mn and Zn in tap water.
社団法人日本分析化学会の論文
1980-11-05