Lead(II) ion selective electrodes with PVC membranes based on two bis-thioureas as ionophores: 1,3-bis(N'-benzoylthioureido)benzene and 1,3-bis(N'-furoylthioureido)benzene

Deivy Wilson, María de los Ángeles Arada, Salvador Alegret, Manel del Valle

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Abstract

Two PVC membrane ion selective electrodes for Pb(II) ion based on two bis-thioureas: 1,3-bis(N'-benzoylthioureido)benzene and 1,3-bis(N'-furoylthioureido)benzene as ionophores, are reported. A first membrane formulated using 1,3-bis(N'-benzoylthioureido)benzene as carrier exhibited a Nernstian response to Pb(II) over a wide concentration range (4.0×10 -6 to 1.0×10 -2 M) with a slope of 31.5±1.6mV/dec. It showed a fast response time (t 90% =14s) and could be used for 10 weeks without any divergence in potentials. The membrane formulated using 1,3-bis(N'-furoylthioureido)benzene as carrier exhibited a Nernstian response in the concentration range (5.0×10 -6 to 1.0×10 -2 M), with a slope of 30.0±1.3mV/dec. Its response time was t 90% =14s, and it could be used for 14 weeks without any divergence in potentials. The two proposed potentiometric sensors revealed acceptable selectivities for Pb(II) over a wide variety of other metal ions and could be used in a pH range of 2.2-6.0. Both electrodes were assayed in direct potentiometric determination of lead in soils (10-30mg/kg range) with very good performance (0.99935 correlation coefficient in the comparison against ICP-MS method). © 2010 Elsevier B.V.
Original languageEnglish
Pages (from-to)140-146
JournalJournal of Hazardous Materials
Volume181
Issue number1-3
DOIs
Publication statusPublished - 1 Sep 2010

Keywords

  • Bis-thiourea
  • Lead ion selective electrode
  • Potentiometric sensor
  • PVC membrane

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