Abstract
The oxidation of o-aminophenol by chlorate ion takes place in acidic milieu and is catalyzed by a trace amount of vanadium (V). Vanadium (V) oxidizes o-aminophenol to 2-amino-3-phenoxazone, then the vanadium (IV) produced is reoxidized to vanadium (V) by the sodium chlorate. Further oxidation of o-aminophenol proceeds by repetition of these reactions. The oxidation product (2-amino-3-phenoxazone) gives an intense fluorescence; under optimum conditions, the fluorescence intensity is proportional to the concentration of vanadium. The most suitable concentration of o-aminophenol and sodium chlorate for the determination of vanadium (V) were found to be 0.02 M and 2 x 10/sup -4/ M, respectively. From 0.1 ppm to 5 ppm of vanadium (V) can be determined under the optimum conditions; reaction temperature 50/sup 0/C, reaction time 2 h, and at pH 2 +- 0.2. If the reaction time is increased to 3 h at 55/sup 0/C, the method may be extended from 2 ppb to 15 ppb of vanadium. Interferences of diverse ions were tested, among which Fe (III) and Mn (VII) caused positive errors, and Cr (VI), Mo (VI) negative errors if present in 40 fold w/w ratio to V (V).
Hiraki, K;
Shimizu, N;
Nishikawa, Y;
[1]
Shigematsu, T
- Kinki Univ., Higashi-Osaka, Osaka (Japan). Faculty of Science and Technology
Citation Formats
Hiraki, K, Shimizu, N, Nishikawa, Y, and Shigematsu, T.
Fluorometric determination of vanadium (V) by utilizing its catalytic effect on the oxidation of o-aminophenol by chlorate.
Japan: N. p.,
1981.
Web.
Hiraki, K, Shimizu, N, Nishikawa, Y, & Shigematsu, T.
Fluorometric determination of vanadium (V) by utilizing its catalytic effect on the oxidation of o-aminophenol by chlorate.
Japan.
Hiraki, K, Shimizu, N, Nishikawa, Y, and Shigematsu, T.
1981.
"Fluorometric determination of vanadium (V) by utilizing its catalytic effect on the oxidation of o-aminophenol by chlorate."
Japan.
@misc{etde_6450458,
title = {Fluorometric determination of vanadium (V) by utilizing its catalytic effect on the oxidation of o-aminophenol by chlorate}
author = {Hiraki, K, Shimizu, N, Nishikawa, Y, and Shigematsu, T}
abstractNote = {The oxidation of o-aminophenol by chlorate ion takes place in acidic milieu and is catalyzed by a trace amount of vanadium (V). Vanadium (V) oxidizes o-aminophenol to 2-amino-3-phenoxazone, then the vanadium (IV) produced is reoxidized to vanadium (V) by the sodium chlorate. Further oxidation of o-aminophenol proceeds by repetition of these reactions. The oxidation product (2-amino-3-phenoxazone) gives an intense fluorescence; under optimum conditions, the fluorescence intensity is proportional to the concentration of vanadium. The most suitable concentration of o-aminophenol and sodium chlorate for the determination of vanadium (V) were found to be 0.02 M and 2 x 10/sup -4/ M, respectively. From 0.1 ppm to 5 ppm of vanadium (V) can be determined under the optimum conditions; reaction temperature 50/sup 0/C, reaction time 2 h, and at pH 2 +- 0.2. If the reaction time is increased to 3 h at 55/sup 0/C, the method may be extended from 2 ppb to 15 ppb of vanadium. Interferences of diverse ions were tested, among which Fe (III) and Mn (VII) caused positive errors, and Cr (VI), Mo (VI) negative errors if present in 40 fold w/w ratio to V (V).}
journal = []
volume = {30:12}
journal type = {AC}
place = {Japan}
year = {1981}
month = {Dec}
}
title = {Fluorometric determination of vanadium (V) by utilizing its catalytic effect on the oxidation of o-aminophenol by chlorate}
author = {Hiraki, K, Shimizu, N, Nishikawa, Y, and Shigematsu, T}
abstractNote = {The oxidation of o-aminophenol by chlorate ion takes place in acidic milieu and is catalyzed by a trace amount of vanadium (V). Vanadium (V) oxidizes o-aminophenol to 2-amino-3-phenoxazone, then the vanadium (IV) produced is reoxidized to vanadium (V) by the sodium chlorate. Further oxidation of o-aminophenol proceeds by repetition of these reactions. The oxidation product (2-amino-3-phenoxazone) gives an intense fluorescence; under optimum conditions, the fluorescence intensity is proportional to the concentration of vanadium. The most suitable concentration of o-aminophenol and sodium chlorate for the determination of vanadium (V) were found to be 0.02 M and 2 x 10/sup -4/ M, respectively. From 0.1 ppm to 5 ppm of vanadium (V) can be determined under the optimum conditions; reaction temperature 50/sup 0/C, reaction time 2 h, and at pH 2 +- 0.2. If the reaction time is increased to 3 h at 55/sup 0/C, the method may be extended from 2 ppb to 15 ppb of vanadium. Interferences of diverse ions were tested, among which Fe (III) and Mn (VII) caused positive errors, and Cr (VI), Mo (VI) negative errors if present in 40 fold w/w ratio to V (V).}
journal = []
volume = {30:12}
journal type = {AC}
place = {Japan}
year = {1981}
month = {Dec}
}