2-(2-チアゾリルアゾ)-5-ジメチルアミノフェノールと非イオン性界面活性剤を用いるニッケルの二波長吸光光度定量

概要

論文の詳細を見る
2-(2-Thiazolylazo)-5-dimethylaminophenol (TAM) and its nickel chelate were dissolved in a micellar solution of Triton X-100. Two wavelengths were chosen such that the difference between absorbances of the micellar solution was maximal: 560 and 480 nm. The absorbance difference was constant in the pH range of 6.7 to 8.5. Pyrophosphate, tartrate and N-(dithiocarboxy)-glycine (DTCG) were used for masking copper, cobalt, iron(III), zinc and cadmium. In the presence of the masking agents at pH 8.0 10 min was required for full color development. The procedure is as follows : place a test solution containing up to 5.0 μg of nickel in a 25-ml volumetric flask; add 1 ml of 0.5 M sodium tartrate, 2 ml of 0.1 M potassium pyrophosphate, 2 ml of ammonia buffer of pH 8.0, 10mg of DTCG and 2 ml of TAM solution (TAM 0.01 g: Triton X-100 20 g: water 80 g); dilute to the mark with water; stand for 10min; measure the difference in absorbance at 560 nm and 480 nm with 1-cm cell in a full-scale range of 0〜0.3. Beer's law was obeyed over the range (0.3〜5.0) μg of nickel. Sandell's sensitivity was 0.70 ng cm^<-2>. The following amounts (mg) of other ions were tolerated in the determination of 2.0μg of nickel: Fe(III) 3.0, V(V) 4.0, Zn 3.0, Mn(II) 1.5, Cd 0.6, Cu(II) 0.005, Co 0.01, Mg 3.0, Ca 2.0. The present method was applied to the determination of nickel in a sample of granodiorite.
社団法人日本分析化学会の論文
1980-02-05