Kinetic Analysis of the Solvent Extraction of Cadmium(II) Complexes Using a Cadmium-deposited Recessed Microelectrode and Confocal Fluorescence Microscope

Kiyoharu Nakatani; Naoki Sawada; Tatsumi Sato

doi:10.2116/analsci.33.1081

Kinetic Analysis of the Solvent Extraction of Cadmium(II) Complexes Using a Cadmium-deposited Recessed Microelectrode and Confocal Fluorescence Microscope

Anal Sci. 2017;33(9):1081-1084. doi: 10.2116/analsci.33.1081.

Authors

Kiyoharu Nakatani¹, Naoki Sawada¹, Tatsumi Sato¹

Affiliation

¹ Division of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba.

PMID: 28890495
DOI: 10.2116/analsci.33.1081

Abstract

Using a Cd-deposited microelectrode, an electrochemically generated Cd(II) ion in a micro-water phase was reacted with 5-octyloxymethyl-8-quinolinol (HC₈Q) in 1,6-dichlorohexane. The fluorescence intensity of Cd(C₈Q)₂ near the water/oil interface (I_F) was analyzed under a confocal fluorescence microscope. The rate of decrease of I_F was independent of the HC₈Q concentration and pH, but was influenced by the phase-boundary potential between the water and oil phases, suggesting that Cd(II) extraction is governed by Cd(C₈Q)⁺ desorption at the interface.

Keywords: Confocal fluorescence microscope; liquid–liquid interface; microdroplet; microelectrode; solvent extraction.