Effect of inorganic constituents on chemical oxygen demand-I. Bromides are unneutralizable by mercuric sulfate complexation

Shimshon Belkin, Asher Brenner, Aharon Abeliovich

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Abstract

Chemical oxygen demand (COD) assays are widely used for the estimation of the organic carbon content of water and wastewater. The procedure is subject to interference by free halogen ions, the oxidation of which creates artificially high COD values. As part of an investigation of the interferences involved in the COD determination of chemical industries wastewaters, we found that mercuric sulfate complexation, the standard procedure for neutralizing the halogen effects, is suitable for chlorides but is not applicable to bromides. This observation is true both in the presence or absence of chloride or ammonia. Care should therefore be exercised in the interpretation of COD data for bromide-containing samples.

Original languageEnglish
Pages (from-to)1577-1581
Number of pages5
JournalWater Research
Volume26
Issue number12
DOIs
StatePublished - 1 Jan 1992

Keywords

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

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