Sensitive Spectrophotometric Determination of Phosphate Using Silica-Gel Collectors

Phosphate, 3 - 10 nmol, in 1 dm3 of natural-water samples was quantitatively collected along with 10 µmol of Fe(III) ion onto a silica-gel collector in the pH range of 5.4 - 6.2. The amount of Fe(III) ion needed was limited to such a low level that the Pyrocatechol Violet method could be applied wit...

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Bibliographic Details
Published in:Analytical Sciences 2004, Vol.20(2), pp.341-344
Main Authors: NAGAI, Masahiro, SUGIYAMA, Masahito, HORI, Toshitaka
Format: Article
Language:English
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Summary:Phosphate, 3 - 10 nmol, in 1 dm3 of natural-water samples was quantitatively collected along with 10 µmol of Fe(III) ion onto a silica-gel collector in the pH range of 5.4 - 6.2. The amount of Fe(III) ion needed was limited to such a low level that the Pyrocatechol Violet method could be applied without removing the Fe(III) ion, providing a superior determination method for phosphate. Surface-water samples of the north basin of Lake Biwa and the Tanabe Bay in the Wakayama prefecture were selected as being representative of natural water with extremely low phosphate concentrations, and were found to have phosphate concentrations of 3.68 and 4.31 nmol dm-3, respectively.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.20.341