Title: Potentiometric Response Characteristics of Membrane-Based ${\text{Cs}}^{+}$ -Selective Electrodes Containing Ionophore-Functionalized Polymeric Microspheres

Abstract

Cs ⁺ -selective solvent polymeric membrane-based ion-selective electrodes (ISEs) were developed by doping ethylene glycol-functionalized cross-linked polystyrene microspheres (P-EG) into a plasticized poly(vinyl chloride) (PVC) matrix containing sodium tetrakis-(3,5-bis(trifluoromethyl)phenyl) borate (TFPB) as the ion exchanger. A systematic study examining the effects of the membrane plasticizers bis(2-ethylhexyl) sebacate (DOS), 2-nitrophenyl octyl ether (NPOE), and 2-fluorophenyl nitrophenyl ether (FPNPE) on the potentiometric response and selectivity of the corresponding electrodes was performed. Under certain conditions, P-EG-based ion-selective electrodes (ISEs) containing TFPB and plasticized with NPOE exhibited a super-Nernstian response between $1\times {10}^{-3}$ and $1\times {10}^{-4}$  M Cs ⁺ , a response characteristic not observed in analogous membranes plasticized with either DOS or FPNPE. Additionally, the performance of P-EG-based ISEs was compared to electrodes based on two mobile ionophores, a neutral lipophilic ethylene glycol derivative (ethylene glycol monooctadecyl ether (U-EG)) and a charged metallacarborane ionophore, sodium bis(dicarbollyl)cobaltate(III) (CC). In general, P-EG-based electrodes plasticized with FPNPE yielded the best performance, with a linear range from 10 ^-1 –10 ^-5  M Cs ⁺ , a conventional lower detection limit of $8.1\times {10}^{-6}$  M Cs ⁺ , and a response slope of 57.7 mV/decade. The pH response of P-EG ISEs containing TFPB was evaluated for membranes plasticized with either NPOE or FPNPE. In both cases, the electrodes remained stable throughout the pH range 3–12, with only slight proton interference observed below pH 3.

Authors:

Peper, Shane ^[1]; Gonczy, Chad ^[2]

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+ Show Author Affiliations

1. Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, Radiochemical Analysis Group, Chemical & Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
2. Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

Publication Date:

Sat Jan 01 00:00:00 EST 2011

Sponsoring Org.:

USDOE

OSTI Identifier:

1198259

Resource Type:

Published Article

Journal Name:

International Journal of Electrochemistry

Additional Journal Information:

Journal Name: International Journal of Electrochemistry Journal Volume: 2011; Journal ID: ISSN 2090-3537

Publisher:

Hindawi Publishing Corporation

Country of Publication:

Country unknown/Code not available

Language:

English