抄録
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.
本文言語 | 英語 |
---|---|
ページ(範囲) | 631-635 |
ページ数 | 5 |
ジャーナル | analytical sciences |
巻 | 8 |
号 | 5 |
DOI | |
出版ステータス | 出版済み - 1月 1 1992 |
!!!All Science Journal Classification (ASJC) codes
- 分析化学