User menu

Accès à distance ? S'identifier sur le proxy UCLouvain

Problematics and stability of on-line pH measurements in anaerobic environments: The jellied combined electrode.

Primary tabs

Monzambe, K M Naveau, Henry [UCL] Nyns, Edmond-Jacques [UCL] Bogaert, N Bühler, H

Discrepancies of one pH unit and more have been observed after a few days, between continuous on-line in situ pH measurements and instant off-line pH measurements during anaerobic digestion of an agroindustrial wastewater. Concomitantly, the electrical resistance across the porous diaphragm of the on-line electrode increased, and a black clogging developed on its diaphragm. Measurements of the relative liquid junction potential in KCl or Na(2)S solutions excluded that high concentrations of ions such as, K(+), Na(+), Cl(-), HS(-), or S(2-) were the major cause of the drifts in pH values. It has been possible to limit the rapid increase of the liquid junction potential and the black clogging formation on the porous diaphragm either by acidification and/or by overpressurization of the electrode-filling liquid. Continuous on-line in situ pH values consistent with instant off-line pH values over long periods of time have been obtained with a newly designed pH sensor in which a special jellied electrode filling replaced the porous diaphragm.

Document type Article de périodique (Journal article) – Journal Article
Publication date 1988
Journal information "Biotechnology and bioengineering" - Vol. 31, no. 7, p. 659-65 (1988)
Peer reviewed yes
issn 0006-3592
Publication status Publié
Affiliation UCL
Links
  1. San Ka-Yiu, Stephanopoulos Gregory, Studies on on-line bioreactor identification. IV. Utilization of pH measurements for product estimation, 10.1002/bit.260261009
  2. Poncelet Denis, Pauss André, Naveau Henry, Frere Jean-Marie, Nyns Edmond-Jacques, Computation of physicochemical parameters, inter alia, pH, in complex (bio)chemical systems, 10.1016/0003-2697(85)90531-7
  3. Rozzi, Process Biochem., 19, 201 (1984)
  4. Kennedy K. J., Muzar M., Continuous pH measurement for anaerobic digestion, 10.1002/bit.260260612
  5. Bühler, Electrodes de pH: Conservation. Vieillissement. Test et Regeneration, 10 (1980)
  6. Bryant M. P., Microbial Methane Production—Theoretical Aspects, 10.2527/jas1979.481193x
  7. van den Berg, Biotechnol. Bioeng., 16, 1459 (1974)
  8. Bühler, Bases et Problèmes du Mesurage du pH, 13 (1980)
  9. van den Berg, Anal. Chem., 32, 628 (1960)
  10. Arnold, Anal. Chem., 58, 84R (1986)
  11. Bogaerts, Chem. Mag., 4, 139 (1985)
  12. Peech, Agronomy 9 (2)., 914 (1965)
  13. Harned, The Physical Chemistry of Electrolytic, Solutions, 439 (1958)
Bibliographic reference Monzambe, K M ; Naveau, Henry ; Nyns, Edmond-Jacques ; Bogaert, N ; Bühler, H. Problematics and stability of on-line pH measurements in anaerobic environments: The jellied combined electrode.. In: Biotechnology and bioengineering, Vol. 31, no. 7, p. 659-65 (1988)
Permanent URL http://hdl.handle.net/2078.1/13985