All-solid-state potentiometric sensors sensitive to nonionic surfactants based on ionophores containing ethoxylate units

Sílvia Martínez-Barrachina, Julián Alonso, Lleonard Matia, Ramón Prats, Manuel Del Valle

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

Earlier work of potentiometric Ion-selective electrodes (ISEs) sensitive to nonionic surfactants of the polyethoxylate type is further extended. The ISEs constructed were all-solid-state sensors with plasticized PVC membranes. The sensing material was a tetraphenylborate salt of the barium complex with a polyethoxylate nonionic surfactant. As membrane component, the combinations of two polyethoxylates of the nonylphenoxy type, which differed in the number of oxyethylene units (5 or 12), and two different plasticizers, (o-nitrophenyloctyl ether and o-nitrophenylphenyl ether), were tested. The response of these electrodes to different nonionic surfactants and the interference effect of several species has been evaluated. For all the types of tested electrodes, the sensitivities shown were ca. 30.0 mV dec-1 and the limit of detection, ca. 10-5 M, when a nonylphenoxyde with 12 oxyethylene units was used as standard. The membrane with the best response characteristics was then applied in potentiometric titrations of this kind of surfactants in the presence of Ba2+ ion and using tetraphenylborate as the titrant. © 2001 Elsevier Science B.V.
Original languageEnglish
Pages (from-to)811-820
JournalTalanta
Volume54
Issue number5
DOIs
Publication statusPublished - 21 Jun 2001

Keywords

  • Alkylphenol polyethoxylates
  • All-solid-state ion-selective electrode
  • Nonionic surfactants
  • Plasticized PVC-membrane

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