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

Fingerprint

Biological Oxygen Demand Analysis
cerium
Chemical oxygen demand
Oxidants
chemical oxygen demand
sulfate
Injections
Cerium
Lactose
Chlorides
Glutamic Acid
Wastewater
Waste Water
absorbance
Ions
Limit of Detection
Oxidation
chloride
wastewater
oxidation

Keywords

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

ASJC Scopus subject areas

  • Biochemistry
  • Analytical Chemistry
  • Spectroscopy
  • Environmental Chemistry

Cite this

Determination of chemical oxygen demand by a flow-injection method using cerium(IV) sulphate as oxidizing agent. / Korenaga, Takashi; Zhou, Xiaojing; Okada, Kimiko; Moriwake, Tosio; Shinoda, Sumio.

In: Analytica Chimica Acta, Vol. 272, No. 2, 12.02.1993, p. 237-244.

Research output: Contribution to journalArticle

Korenaga, Takashi ; Zhou, Xiaojing ; Okada, Kimiko ; Moriwake, Tosio ; Shinoda, Sumio. / Determination of chemical oxygen demand by a flow-injection method using cerium(IV) sulphate as oxidizing agent. In: Analytica Chimica Acta. 1993 ; Vol. 272, No. 2. pp. 237-244.
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