Improved Thin-layer Electrolysis Cell for Ion Transfer at the Liquid|Liquid Interface Using a Conducting Polymer-coated Electrode

Yoshida, Yumi; Uchida, Junya; Nakamura, Shotaro; Yamaguchi, S.; Maeda, Kohji

doi:10.2116/analsci.30.351

Cited by 5 publications

(2 citation statements)

References 51 publications

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“…Potentiometric sensing probes are operated under zero current conditions, but a number of attractive analytical characteristics have recently been reported when such membranes are interrogated by either controlled current or potential techniques. Recent examples include constant-current chronopotentiometry, − thin layer coulometry, − and ion-transfer stripping voltammetry. − …”

Section: Introductionmentioning

confidence: 99%

Electrochemically Switchable Polymeric Membrane Ion-Selective Electrodes

Zdrachek

Bakker

2018

Anal. Chem.

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We present here for the first time a solid contact ion-selective electrode suitable for the simultaneous sensing of cations (tetrabutylammonium) and anions (hexafluorophosphate), achieved by electrochemical switching. The membrane is based on a thin plasticized polyurethane membrane deposited on poly(3-octylthiophene) (POT) and contains a cation exchanger and lipophilic electrolyte (ETH 500). The cation exchanger is initially in excess; the ion-selective electrode exhibits an initial potentiometric response to cations. During an oxidative current pulse, POT is converted into POT, which results in the expulsion of cations from the membrane followed by the extraction of anions from the sample solution to fulfill the electroneutrality condition. This creates a defined excess of lipophilic cation in the membrane, resulting in a potentiometric anion response. A reductive current pulse restores the original cation response by triggering the conversion of POT back into POT, which is accompanied by the expulsion of anions from the membrane and the extraction of cations from the sample solution. Various current pulse magnitudes and durations are explored, and the best results in terms of response slope values and signal stability were observed with an oxidation current pulse of 140 μA cm applied for 8 s and a reduction current pulse of -71 μA cm applied for 8 s.

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Section: Introductionmentioning

confidence: 99%

Electrochemically Switchable Polymeric Membrane Ion-Selective Electrodes

Zdrachek

Bakker

2018

Anal. Chem.

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“…[45][46][47][48][49] The excessive amount of conductive polymer relative to the transferring ion exhibits a stable constant potential in conductive polymer-coated electrodes. 50,51 We examined the composition of a PEDOT-PEG:TFPB paste suitable for coulometry. Table 1 shows the composition of the prepared PEDOT-PEG:TFPB paste.…”

Section: The Optimum Composition Of Pedot-peg:tfpb-pastementioning

confidence: 99%

Coulometric Determination of Perfluoroalkyl Substances (PFAS) with the Thin-layer Electrolysis Flow Cell for the Ion Transfer

IWASAKI,

UCHIDA,

YAMANA

et al. 2023

Electrochemistry

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Coulometric determination of perfluorooctane sulfonate (PFOS − ) and perfluorohexanesulfonate (PFHxS − ), which are ionic perfluoroalkyl substances (PFAS ion), was demonstrated with a thin-layer electrolysis flow cell for the ion transfer (flow-TLECIT). Flow-TLECIT has a simple structure consisting of a Ag/AgCl plate electrode, a spacer with a flow path for aqueous sample solution, an organic liquid membrane hold in the porous membrane, and the conducting polymer paste-coated carbon electrode. The conductive polymer paste was made of poly(3,4ethylenedioxythiophene) modified with lauryl-terminated bispoly(ethyleneglycol) (PEDOT-PEG) for screen-printing the conducting polymer on the carbon electrode. Flow-TLECIT achieved the complete mass transfer of PFAS ion from the aqueous sample solution to the organic membrane under applying a constant potential between the Ag/AgCl plate electrode and the conducting polymer paste-coated carbon electrode and detects the transfer of PFAS ion as current. The integrated current (electrical charge) can be converted to the mole amount of PFAS ion. For PFHxS − , the evaluated amount was 97 %-103 % of the theoretical mole amount in the concentration range of 5-200 µM and the repeatability in the same cell were ±1 %-±5 % (n = 8). For PFOS − , the evaluated amount was 102 % of the theoretical mole amount in the concentration of 18.3 µM and the repeatability in the same cell is ±4 % (n = 3). Flow-TLECIT has advantages such as (1) the flow system suitable for continuous measurement, (2) a simple and inexpensive device, and (3) calibration-free.

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