Lead-selective electrode based on a quinaldic acid derivative

Maria Casado, Sylvia Daunert, Manuel Valiente

Research output: Contribution to journalReview article

21 Scopus citations

Abstract

The derivative of quinaldic acid, 8-(dodecyloxy)quinoline-2-carboxylic acid, has been used as an ionophore in the development of a lead(II)-selective electrode. Solvent extraction studies showed that this compound is selective for lead(II) and copper(II) over a variety of divalent and monovalent metals. Liquid polymeric membranes of plasticized poly(vinyl chloride) were prepared using bis-(2-ethylhexyl) sebacate as the plasticizer and the lead(II) complex of 8-dodecyloxy quinoline-2-carboxylic acid as the ionophore. The effect of several parameters, such as content of ionophore in the membrane, pH of the sample solution, and electrode conditioning was investigated. When optimized, the electrode responded in a near-Nernstian fashion to lead(II) and the detection limit was found to be 5.0 × 10-7 M. The electrode is selective for Pb2+ over Cu2+, Al3+, Mn2+, Ni2+, Co2+, Zn2+, Mg2+, Ca2+, Na+, K+, with Hg2+ and Cu2+ the most interfering metal ions.

Original languageEnglish (US)
Pages (from-to)54-60
Number of pages7
JournalElectroanalysis
Volume13
Issue number1
DOIs
StatePublished - Feb 19 2001
Externally publishedYes

    Fingerprint

Keywords

  • Ion selective electrode
  • Lead
  • PVC membrane
  • Quinaldic acid
  • Solvent extraction

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this