Potentiometric FIA of chromium(VI) in seawater

Hiroki Ohura, Sumio Yamasaki, Toshihiko Imato, Nobuhiko Ishibashi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A sensitive and rapid potentiometric FIA method for the determination of Cr(VI) in seawater is proposed, using both a redox potential electrode and an Fe(III)-Fe(II) potential buffer containing bromide. The method is based on the detection of a large transient potential change due to bromine generated by an oxidation reaction between bromide and Cr(VI) in the presence of Fe(II). The oxidation reaction was estimated to be induced by Fe(II) from spectrophotometric studies. A sensitive determination of Cr(VI) was achieved by detecting the sharp transient potential change within 10s after mixing the Cr(VI) sample with the potential buffer by using an appropriately designed FIA system. Analytical sensitivity obtained by the proposed method is enhanced to about 70 times that of on FIA system using a potential buffer without bromide. A detection limit of 2X10-8M Cr(VI) was achieved by using a 1×10-4M Fe(III)-Fe(II) potential buffer containing 0.4 M NaBr and 1.2 M H2SO4. The R.S.D. was 0.6% (n=6) for the determination of 1×10-6 M Cr(VI) with the sampling rate of about 40 h-1. Several heavy metal ions such as Cr(III), Cu(II), Zn(II), Ni(II) and Cd(II) did not interfere with the determination of Cr(VI) even in the case where their concentration was more than 103 times that of Cr(VI). The proposed method was applied to the determination of Cr(VI) in real seawater sample, and was found to provide a good recovery for seawater samples containing Cr(VI) at the 500 ppb level, a concentration of effluent common in Japan.

Original languageEnglish
Pages (from-to)31-37
Number of pages7
Journalbunseki kagaku
Volume43
Issue number1
DOIs
Publication statusPublished - Jan 1 1994

Fingerprint

Seawater
Buffers
Bromides
chromium hexavalent ion
Bromine
Oxidation
Heavy Metals
Heavy ions
Metal ions
Effluents
Sampling
Recovery
Electrodes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

Ohura, H., Yamasaki, S., Imato, T., & Ishibashi, N. (1994). Potentiometric FIA of chromium(VI) in seawater. bunseki kagaku, 43(1), 31-37. https://doi.org/10.2116/bunsekikagaku.43.31

Potentiometric FIA of chromium(VI) in seawater. / Ohura, Hiroki; Yamasaki, Sumio; Imato, Toshihiko; Ishibashi, Nobuhiko.

In: bunseki kagaku, Vol. 43, No. 1, 01.01.1994, p. 31-37.

Research output: Contribution to journalArticle

Ohura, H, Yamasaki, S, Imato, T & Ishibashi, N 1994, 'Potentiometric FIA of chromium(VI) in seawater', bunseki kagaku, vol. 43, no. 1, pp. 31-37. https://doi.org/10.2116/bunsekikagaku.43.31
Ohura H, Yamasaki S, Imato T, Ishibashi N. Potentiometric FIA of chromium(VI) in seawater. bunseki kagaku. 1994 Jan 1;43(1):31-37. https://doi.org/10.2116/bunsekikagaku.43.31
Ohura, Hiroki ; Yamasaki, Sumio ; Imato, Toshihiko ; Ishibashi, Nobuhiko. / Potentiometric FIA of chromium(VI) in seawater. In: bunseki kagaku. 1994 ; Vol. 43, No. 1. pp. 31-37.
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AB - A sensitive and rapid potentiometric FIA method for the determination of Cr(VI) in seawater is proposed, using both a redox potential electrode and an Fe(III)-Fe(II) potential buffer containing bromide. The method is based on the detection of a large transient potential change due to bromine generated by an oxidation reaction between bromide and Cr(VI) in the presence of Fe(II). The oxidation reaction was estimated to be induced by Fe(II) from spectrophotometric studies. A sensitive determination of Cr(VI) was achieved by detecting the sharp transient potential change within 10s after mixing the Cr(VI) sample with the potential buffer by using an appropriately designed FIA system. Analytical sensitivity obtained by the proposed method is enhanced to about 70 times that of on FIA system using a potential buffer without bromide. A detection limit of 2X10-8M Cr(VI) was achieved by using a 1×10-4M Fe(III)-Fe(II) potential buffer containing 0.4 M NaBr and 1.2 M H2SO4. The R.S.D. was 0.6% (n=6) for the determination of 1×10-6 M Cr(VI) with the sampling rate of about 40 h-1. Several heavy metal ions such as Cr(III), Cu(II), Zn(II), Ni(II) and Cd(II) did not interfere with the determination of Cr(VI) even in the case where their concentration was more than 103 times that of Cr(VI). The proposed method was applied to the determination of Cr(VI) in real seawater sample, and was found to provide a good recovery for seawater samples containing Cr(VI) at the 500 ppb level, a concentration of effluent common in Japan.

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