Determination of low citric acid concentrations in a mixture of weak acid/bases

Ori Lahav*, Emily Shlafman, Malka Cochva

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A titration approach was developed to measure low concentrations of citric acid (C6H8O7) in a mixture of other weak acid/bases. Two methods were tested. The first and more practical method (a 4-point titration procedure) is applicable in conditions where volatile fatty acids (VFAs) are not normally present. The second method (a 5-point titration procedure) was developed for anaerobic environments where VFAs may be encountered. Generally, fairly accurate and repetitive results (precision >95%) were obtained for both situations although stability and accuracy were better in the absence of VFA. Both methods can be used for routine monitoring of biological reactors where citric acid is added as a carbon source and electron donor. Mg2+ and Ca2+ form complexes with citric acid and thus inhibit the use of the method. To overcome this, a sodium-saturated cationic ion exchanger was used to exchange these cations with Na+. Following cation exchange, citric acid concentration was determined accurately using the method.

Original languageEnglish
Pages (from-to)497-502
Number of pages6
JournalWater S.A.
Volume31
Issue number4
StatePublished - Oct 2005
Externally publishedYes

Keywords

  • Acid titration
  • Citric acid measurement
  • Mixed weak-acid system
  • VFA

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