Plasticizer-Free Polymer Membrane Ion-Selective Electrodes Containing a Methacrylic Copolymer Matrix

Qin, Yu; Peper, Shane M.; Bakker, Eric

doi:10.1002/1521-4109(200211)14:19/20<1375::aid-elan1375>3.0.co;2-8

Cited by 91 publications

(85 citation statements)

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“…It has been reported that the buildup of well-defined interface through the selection of the conductive polymer films does not necessarily lead to good performances of SC-ISEs [21], however, a thin aqueous layer formed between the ion-selective membrane and the conducting polymer could account for the potential drifts and poor detection limits of the electrodes [22,23]. Recently, a novel approach was developed for the production of analytically robust sensors by the use of an acrylate copolymer (P(MMA-DMA)) as the ion-selective membrane matrix, and poly(3-octylthiophene) (POT) solid contact as the ion-to-electron transducer [1,19,23,24]. The diffusion coefficients in P(MMA-DMA) copolymer (∼10 −11 cm 2 s −1 ) are up to three orders of magnitude lower than those for conventional plasticize PVC membranes [25], which may make it relatively robust to chemical changes at the inner membrane side.…”

Section: Introductionmentioning

confidence: 99%

A solid-contact Pb2+-selective electrode using poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene) as ion-to-electron transducer

Yin

et al. 2011

Analytica Chimica Acta

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a b s t r a c tIn this work, a novel all-solid-state polymeric membrane Pb 2+ -selective electrode was developed by using for the first time poly(2-methoxy-5-(2 -ethylhexyloxy)-p-phenylene vinylene) (MEH-PPV) as solid contact. To demonstrate the ion-to-electron transducing ability of MEH-PPV, chronopotentiometry and electrochemical impedance spectroscopy measurements were carried out. The proposed electrodes showed a Nernstian response of 29.1 mV decade −1 and a lower detection limit of subnanomolar level. No water film was observed with the conventional plasticized PVC membrane. This work demonstrates a new strategy for the fabrication of robust potentiometric ion sensors.

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Section: Introductionmentioning

confidence: 99%

A solid-contact Pb2+-selective electrode using poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene) as ion-to-electron transducer

Yin

et al. 2011

Analytica Chimica Acta

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“…The methyl methacrylate-decyl methacrylate (MMA-DMA) copolymer matrix was synthesized as described before [12] .…”

Section: Reagentsmentioning

confidence: 99%

Electrochemical Sensing System for Determination of Heavy Metals in Seawater

Song

Wang

Ding

et al. 2012

Chinese Journal of Analytical Chemistry

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“…Poly(3-octylthiophene) (POT) was synthesized following the procedure of Jarvinen et al 21 and was purified according to the patent application. 22 The synthesis of methyl methacrylate-decyl methacrylate (MMA-DMA) copolymer matrix was based on Qin et al 23 The cadmium ion standard solution was purchased from Fluka while bismuth standard stock solution and acetate buffer were obtained from Sigma-Aldrich (St. Louis, USA). All stock solutions were prepared using double deionized water (18.2 MΩ cm).…”

Section: Experimental Reagentsmentioning

confidence: 99%

Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes

et al. 2008

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Potentiometric sensors are today sufficiently well understood and optimized to reach ultra-trace level (sub-nanomolar) detection limits for numerous ions. In many cases of practical relevance, however, a high electrolyte background hampers the attainable detection limits. A particularly difficult sample matrix for potentiometric detection is seawater, where the high saline concentration forms a major interfering background and reduces the activity of most trace metals by complexation. This paper describes for the first time a hyphenated system for the online electrochemically modulated preconcentration and matrix elimination (EMPM) of trace metals, combined with a downstream potentiometric detection with solid contact polymeric membrane ion-selective microelectrodes. Following the preconcentration at the bismuth coated electrodes, the deposited metals are oxidized and released to a medium favorable to potentiometric detection, in this case calcium nitrate. Matrix interferences arising from the saline sample medium are thus circumvented. This concept is successfully evaluated with cadmium as a model trace element and offers potentiometric detection down to low parts per billion levels in samples containing 0.5 M NaCl background electrolyte.Recent improvements in the detection limits of ISEs based on polymeric membranes containing selective receptors (ionophores) yielded potentiometric sensors for the direct measurement of ions down to the subnanomolar concentration range. 1 This was made possible by minimizing diffusional ion fluxes from the membrane into the sample solution. 2, 3 Today potentiometry routinely achieves detection limits in the nanomolar or lower concentration range without any accumulation step and with essentially no sample perturbation. 1 Unfortunately, ISEs are normally incapable of reaching the same detection limits in undiluted seawater samples, primarily owing to the very high levels of electrolyte (salt) background and the complexation of the target metal ion. Additionally, seawater contains natural organic matter and surfactants that may interfere with the ISE response via adsorption and extraction processes.To overcome related seawater matrix effects, detection techniques such as ICP-MS 4 and electrospray MS, 5 among others, make use of preconcentration methods that separate the target analyte from the complex matrix. The methods used for matrix separation include liquid-liquid extraction, 6, 7 sorption on solid sorbents or exchangers, 8, 9 coprecipitation 10 and electrodeposition. 5 It is the last one which is considered most suitable for preconcentration, because the procedures are relatively fast compared with chemical preconcentration and the technique can be automated to provide continuous accumulation. In addition, when used in an on-line format, these preconcentration methods minimize manual sample handling and offer NIH Public Access Experimental ReagentsThe ionophores N, N,N′,, N,NDicyclohexyl-N′,N′-dioctadecyl-diglycolic diamide (ETH 5234), lipophilic cation exchanger s...

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Plasticizer-Free Polymer Membrane Ion-Selective Electrodes Containing a Methacrylic Copolymer Matrix

Cited by 91 publications

References 0 publications

A solid-contact Pb2+-selective electrode using poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene) as ion-to-electron transducer

A solid-contact Pb2+-selective electrode using poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene) as ion-to-electron transducer

Electrochemical Sensing System for Determination of Heavy Metals in Seawater

Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes

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