Ion selective electrodes for microalgal biotechnology

Mihaela Calugareanu, Géa Nagy, Ana Maria Josceanu, Lívia Nagy

Research output: Contribution to journalArticle

5 Citations (Scopus)


This paper presents the results obtained in monitoring potassium, calcium, and magnesium ions content in Chorella homosphaera 424 culture media using in-house manufactured potassium, calcium and magnesium ion selective electrodes. The sensors were prepared with poly (vinyl chloride) plasticized with o-nitrophenyl octyl ether. Valinomycin(I), N, N, N', N'-tetra[cyclohexyl] diglycolic acid diamine, and bis-N,N-dicyclohexylmalonamide were chosen as ionophores. The membranes worked well in the 10-4-10-1 mol/L concentration range, displaying Nemstian slopes of 57.0±1.0, 27.0±1.0, and 27.0±0.5 mV per decade of K+, Ca 2+, and Mg2+ ionsactivity. The electrodes responses showed pH dependence at pH < 4.0 and at pH > 11.0. The selectivity coefficients, measured by the mixed solutions method, ranged from 1.0.10-1 to 3.2. 10-9. The newly prepared sensors gave good results in monitoring potassium, calcium, and magnesium levels in Chlorella homosphaera 424 culture media, as cross-checked by AAS.

Original languageEnglish
Pages (from-to)205-209
Number of pages5
JournalRevista de Chimie
Issue number2
Publication statusPublished - Feb 2013



  • Algal culture media
  • Ion selective electrode
  • Selectivity coefficients

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science (miscellaneous)
  • Engineering(all)
  • Surfaces, Coatings and Films
  • Materials Chemistry

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