Effect of inorganic constituents on chemical oxygen demand-II. Organic carbon to halogen ratios determine halogen interference

Shimshon Belkin, Asher Brenner, Aharon Abeliovich

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The dependency of free halogen ion oxidation in chemical oxygen demand (COD) assays on the organic content of the sample was investigated. Halogen interference was reduced at increasing glucose or potassium hydrogen phthalate concentration; in each case, a threshold ratio of organic matter to halogen existed, above which halogen oxidation was masked. This ratio depended upon the presence of mercuric sulfate in the case of chloride but not of bromide. It was also affected by the ease of oxidation of both the organic molecule and the halogen ion, as well as by their actual COD. Thus, bromide oxidation was more difficult to prevent than that of chloride, and phthalate exerted a stronger masking effect than glucose.

Original languageEnglish
Pages (from-to)1583-1588
Number of pages6
JournalWater Research
Volume26
Issue number12
DOIs
StatePublished - 1 Jan 1992

Keywords

  • bromide
  • chemical oxygen demand (COD)
  • chloride
  • halogen interference
  • industrial wastewater

ASJC Scopus subject areas

  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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