Flow-Injection Determination of the Total Water Hardness by Using a Copper(II) Ion-Selective Electrode and a Copper(II) Ion Buffer

Toshihiko Imato, Kazuya Ishii, Nobuhiko Ishibashi

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    A potentiometric determination of the total water hardness by flow-injection analysis is proposed, which uses both a Cu2+ ion-selective electrode detector and a Cu2+-ion buffer stream comprising a Cu-EDTA complex and free EDTA. This method is based on potentiometric monitoring of the change in the free Cu2+-ion concentration in the buffer with a Cu2+ ion-selective electrode, caused by the reaction of Ca2+ and Mg2+ ions with free EDTA in the buffer. Chloride interference in the measurement of the Cu2+-ion concentrations with the Cu2+ ion-selective electrode was successfully eliminated by adding triethylenetetramine to the Cu2+-ion buffer. The total hardness of seawater samples could therefore be determined at a sampling rate of 30 h-’ and a relative standard deviation of 0.7%. The obtained results using the proposed method were in good accord with those obtained by conventional chelatometric titration.

    Original languageEnglish
    Pages (from-to)631-635
    Number of pages5
    Journalanalytical sciences
    Volume8
    Issue number5
    DOIs
    Publication statusPublished - Jan 1 1992

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry

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