Lipophilic and immobilized anionic additives in solvent polymeric membranes of cation-selective chemical sensors

Thomas Rosatzin, Eric Bakker, Koji Suzuki, Wilhelm Simon

Research output: Contribution to journalArticle

482 Citations (Scopus)

Abstract

Lipophilic borate salts are frequently used as anionic additives in potentiometric and optical cation-selective sensors based on solvent polymeric membranes. The lifetime of such membranes may be limited owing to chemical decomposition and leaching of the components. Borate salts, in particular, are decomposed in the presence of acids in the membrane. Adequately substituted borate salts and sulphonic acids, such as sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate, sodium tetrakis[3,5-bis(2-methoxyhexafluoro-2-propyl)phenyl]borate and dinonylnaphthalenesulphonic acid (DNSS), are shown to be sufficiently stable as membrane additives. Furthermore, lipoholic mobile or immoblizied sulphonic acids [DNNS or poly(2-acrylamido-2-methyl-1-propanesulphonic acid-co-styrene), respectively were also tested as anionic additives. Their influence on the selectivity behaviour of the sensor is attributed to their strong association with positively charged species in the membrane phase. It may be kept small by choosing ionophores that from stable complexes with the analyte.

Original languageEnglish
Pages (from-to)197-208
Number of pages12
JournalAnalytica Chimica Acta
Volume280
Issue number2
DOIs
Publication statusPublished - 1993 Aug 16

Keywords

  • Ion selective electrodes
  • Membrane electrodes
  • Optodes
  • Sensors
  • Solvent polymeric membranes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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