Determination of chemical oxygen demand by a flow-injection method using cerium(IV) sulphate as oxidizing agent

Takashi Korenaga, Xiaojing Zhou, Kimiko Okada, Tosio Moriwake, Sumio Shinoda

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

A method based on flow injection was developed for the automated determination of chemical oxygen demand (COD) that provided a number of possibilities for improvement of the limitations of the standard manual methods. The strong oxidizing agent used is cerium(IV) sulphate, which resulted in a high degree of sample oxidation under mild operating conditions. The reaction between samples and cerium(IV) ion produced a sensitive and reproducible signal, i.e., a decrease in absorbance. The detection limit and relative standard deviation of the method were 0.5 mg l-1 and 0.6% (n = 10), respectively, for a standard sample consisting of l-glutamic acid and lactose in a ratio of 5:1. When 50-μl samples were injected at a frequency of 20 h-1, the determination range was 0.5-130 mg l-1 COD. Chloride was tolerated up to a concentration of 30 g l-1 without any masking agents. COD values for various types of wastewater samples correlated well with those obtained by standard manual methods.

Original languageEnglish
Pages (from-to)237-244
Number of pages8
JournalAnalytica Chimica Acta
Volume272
Issue number2
DOIs
Publication statusPublished - Feb 12 1993

Keywords

  • Cerium(IV) sulphate
  • Chemical oxygen demand
  • Flow injection
  • UV-Visible spectrophotometry
  • Waters

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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