Colloidal Titration with Poly(Styrene Sulfonate) as Titrant - Metachromagy of Toluidine Blue and Its Potentiometric Colloidal Titration -

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  • HATTORI Toshiaki
    Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology Department of Materials Science, Toyohashi University of Technology, Toyohashi University of Technology
  • NAITO Yoko
    Department of Materials Science, Toyohashi University of Technology, Toyohashi University of Technology
  • ITO Yoshinori
    Department of Materials Science, Toyohashi University of Technology, Toyohashi University of Technology
  • KATO Ryo
    Cooperative Research Facility Center, Toyohashi University of Technology
  • HIRATA Yukio
    Department of Materials Science, Toyohashi University of Technology, Toyohashi University of Technology Department of Environmental and Life Sciences, Toyohashi University of Technology
  • YOSHINO Akihiro
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology

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Other Title
  • ポリスチレンスルホン酸を滴定剤としたコロイド滴定－トルイジンブルーのメタクロマジーと電位差コロイド滴定－
  • ポリスチレンスルホンサン オ テキテイザイ ト シタ コロイド テキテイ トルイジンブルー ノ メタクロマジー ト デンイサ コロイド テキテイ

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Abstract

Metachromagy of Toluidine Blue (TB) with poly(4-styrenesulfonate) (PSS) and poly(vinyl sulfate) (PVS) were studied by visible observation using a micro-plate, visible spectra, and 1H-NMR spectra in light water. It was found that the negative metachromagy of poly(styrene sulfonate) was due to the π-stacking of TB onto poly(4-styenesulfonate). The π-stacking interaction brings about the random ion-association of TB onto PSS and causes a dim color change of TB at the end-point on the visible colloidal titration with PSS. Tetradecyltrimethylbenzyl ammonium (Zeph) and poly(diaryldimethyl ammonium) (PDADMAC) were titrated by potentiometric colloidal titration with PSS using an ion surfactant electrode. The potentiometric titration curve of Zeph indicated a typical sigmoid curve without TB. The potentiometric titration curve of PDADMAC indicated a clear decrease in potential change to TB at the end-point. Both potentiometric colloidal titrations were quantitative. Thus, PSS is able to become a standard polyanion titrant as well as PVS. When Zeph was used as a standard cation on colloidal titration, the determination result of PDADMAC with PSS agreed with the result of colloidal titration with PVS within 2% of the relative difference.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 60 (5), 419-426, 2011

    The Japan Society for Analytical Chemistry

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