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Ionic liquid salt bridge in dilute aqueous solutions. | LitMetric

Ionic liquid salt bridge in dilute aqueous solutions.

Anal Sci

Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan.

Published: September 2007

AI Article Synopsis

  • A new salt bridge has been developed using a hydrophobic room-temperature ionic liquid that works well in very dilute aqueous solutions.
  • This ionic liquid, [C(8)mim+][C(1)C(1)N-], shows a stable phase-boundary potential when in contact with submillimolar KCl solutions, indicating reliability in low concentration settings.
  • The ionic-liquid salt bridge is found to be more effective than traditional salt bridges, especially for measuring low ionic strength solutions like rainwater pH levels.

Article Abstract

A new type of salt bridge composed of a hydrophobic room-temperature ionic liquid, recently proposed (T. Kakiuchi and T. Yoshimatsu, Bull. Chem. Soc. Jpn., 2006, 79, 1017), has been shown to be satisfactorily usable in dilute aqueous solutions of submillimolar range. A stable phase-boundary potential has been demonstrated between an ionic liquid, 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C(8)mim+][C(1)C(1)N-), and an aqueous KCl solution of submillimolar level, which is lower than the solubility of [C(8)mim+][C(1)C(1)N-] in water, 1.6 mmol dm(-3) at 25 degrees C. The phase-boundary potential between [C(8)mim+][C(1)C(1)N-] and water is maintained constant over more than four orders of magnitude change in the concentration of an aqueous electrolyte solution. The ionic-liquid salt bridge is a superior alternative to salt bridges based on equitransferent electrolytes in practical applications, particularly, the potentiometry of samples of low ionic strengths, such as potentiometric pH measurements of rainwater.

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Source
http://dx.doi.org/10.2116/analsci.23.1049DOI Listing

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