2-(2-チアゾリルアゾ)-4-メチルフェノールを含むポリ塩化ビニル膜による数種の金属イオンの簡易比色定量法

概要

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A transparent test film for the rapid and semiquantitative determination of small amounts of copper, zinc, cadmium, nickel and cobalt was prepared. The test film is composed of 2-(2-thiazolylazo)-4-methyl phenol (TAC), tributyl phosphate (TBP) and polyvinyl chloride (PVC). The color of the film changes from yellow to brownish green by immersing it in a sample solution. The color intensity of the film is proportional to the metal concentration in a sample solution, and thus the concentration of the metal can be determined by a standard series method. When the film is immersed for 1 min in 3 ml of the sample solution buffered at pH 8.5 with ammonium nitrate-ammonia solution, the detection limits of the copper, zinc, nickel and cobalt are I ppm and of cadmium is 2.5 ppm. With increase of the immersing time of the film, its color becomes much darker. Maximum absorption wavelengths of copper, zinc, cadmium, nickel and cobalt are 616nm, 600 nm, 598 nm, 618nm and 586 nm. Preparation of the test film: 10mg of TAC and 1 g of PVC are dissolved in the mixed solvent of 8 ml of tetrahydrofuran and 1.5 ml of TBP. After the solution is mixed with 2 ml of acetone, the mixture is placed on a glass plate for a few hours to evaporate the solvent slowly. The resulting film (0.3 mm thick) is cut in 1 cm × 1 cm for the analytical operation.
社団法人日本分析化学会の論文
1980-07-05