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Chronopotentiometric Carbonate Detection with All-Solid-State lonophore-Based Electrodes
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2014 (English)In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 86, no 13, 6307-6314 p.Article in journal (Refereed) Published
Abstract [en]

We present here for the first time an all-solid-state chronopotentiometric ion sensing system based on selective ionophores, specifically for the carbonate anion. A chronopotentiometric readout is attractive because it may allow one to obtain complementary information on the sample speciation compared to zero-current potentiometry and detect the sum of labile carbonate species instead of only ion activity. Ferrocene covalently attached to the PVC polymeric chain acts as an ion-to-electron transducer and provides the driving force to initiate the sensing process at the membrane–sample interface. The incorporation of a selective ionophore for carbonate allows one to determine this anion in a background electrolyte. Various inner electrolyte and all-solid-state-membrane configurations are explored, and localized carbonate depletion is only observed for systems that do not contain ion-exchanger additives. The square root of the transition times extracted from the inflection point of the chronopotentiograms as a function of carbonate specie concentration follows a linear relationship. The observed linear range is 0.03–0.35 mM in a pH range of 9.50–10.05. By applying the Sand equation, the diffusion coefficient of carbonate is calculated as (9.03 ± 0.91) 10–6 cm2 s–1, which corresponds to the established value. The reproducibility of assessed carbonate is better than 1%. Additionally, carbonate is monitored during titrimetric analysis as a precursor to an in situ environmental determination. Based on these results, Fc-PVC membranes doped with ionophores may form the basis of a new family of passive/active all-solid-state ion selective electrodes interrogated by a current pulse.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014. Vol. 86, no 13, 6307-6314 p.
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Chemical Sciences
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URN: urn:nbn:se:kth:diva-206916DOI: 10.1021/ac5004163ISI: 000338488800022ScopusID: 2-s2.0-84903737321OAI: oai:DiVA.org:kth-206916DiVA: diva2:1094369
Note

QC 20170517

Available from: 2017-05-09 Created: 2017-05-09 Last updated: 2017-05-17Bibliographically approved

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CiteExportLink to record
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  • apa
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