Potentiometric flow-injection determination of trace chlorine based on its redox reaction with an iron(III)/iron(II) buffer

Nobuhiko Ishibashi, Toshihiko Imato, Hiroki Ohura, Sumio Yamasaki

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    A very sensitive and rapid potentiometric determination of trace chlorine in water is described. The method is based on the transient potential changes which appears during the reduction of dissolved chlorin with an iron(III)/iron(II) potential buffer containing chloride and sulfuric acid. The sample is injected into a water carrier stream and merged with a stream of this potential buffer solution; chlorine is reduced during passage through a short reaction coil. The potential change from the baseline is measured with a flow-through ORP (oxidation-reduction potential) electrode. Potential changes (peak heights) are proportional to chlorine concentrations from 10-7 M to 10-5 M. The detection limit is 5 × 10-8 M (3.5 μgl-1 as Cl2). The sample throughput is 45 h-1. Reproducibility is in the range 2.5-1.1%. Results for potable water agree with those obtained by the o-tolidine method.

    Original languageEnglish
    Pages (from-to)349-357
    Number of pages9
    JournalAnalytica Chimica Acta
    Volume214
    Issue numberC
    DOIs
    Publication statusPublished - Jan 1 1988

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry
    • Biochemistry
    • Environmental Chemistry
    • Spectroscopy

    Fingerprint

    Dive into the research topics of 'Potentiometric flow-injection determination of trace chlorine based on its redox reaction with an iron(III)/iron(II) buffer'. Together they form a unique fingerprint.

    Cite this