Kinetic analysis of extraction-back extraction of lanthanoid with tributyl phosphate in the cylindrical micro droplet/solution system

Kusano, Yuka*; Nakagawa, Ryogo*; Nagatomo, Shigenori*; Sano, Yuichi   ; Nakatani, Kiyoharu*

The columnar cavities formed on the microelectrodes were filled with a tributyl phosphate extractant, immersed in a nitric acid solution, and irradiated with laser light on the columnar droplets, and the temporal changes in the luminescence intensity of the lanthanoid complex were tracked. The change with time was analyzed by a single exponential function, and the extraction and back-extraction rates were calculated. The mechanism of mass transfer was discussed kinetically from the viewpoints of diffusion inside and outside the droplet, interfacial reaction, etc.