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

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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-1 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.

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Authors and Affiliations

  1. Department of Chemical Science and Technology, Faculty of Engineering, Kyushu University, Hakozaki, Fukuoka, 812, Japan

    Toshihiko Imato, Kazuya Ishii & Nobuhiko Ishibashi

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  1. Toshihiko Imato
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  2. Kazuya Ishii
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  3. Nobuhiko Ishibashi
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Imato, T., Ishii, K. & Ishibashi, N. Flow-Injection Determination of the Total Water Hardness by Using a Copper(II) Ion-Selective Electrode and a Copper(II) Ion Buffer. ANAL. SCI. 8, 631–635 (1992). https://doi.org/10.2116/analsci.8.631

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  • DOI: https://doi.org/10.2116/analsci.8.631

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