Sensitive Spectrophotometric Determination of Phosphate Using Silica-Gel Collectors
Sensitive Spectrophotometric Determination of Phosphate Using Silica-Gel Collectors
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DOI：
10.2116/analsci.20.341
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发表时间：
2004-02
影响因子：
1.6
通讯作者：
M. Nagai;M. Sugiyama;T. Hori
中科院分区：
文献类型：
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作者：
M. Nagai;M. Sugiyama;T. Hori
在pH值为5.4 ~ 6.2的范围内，将1 dm^3天然水样品中3-10 nmol的磷酸盐与10 μmol的Fe（III）离子一起沿着定量收集到硅胶收集剂上。所需的Fe（III）离子的量被限制在如此低的水平，使得邻苯二酚紫方法可以在不去除Fe（III）离子的情况下应用，从而提供磷酸盐的上级测定方法。作为磷酸盐浓度极低的天然水的代表，我们选择了和歌山县的琵琶湖北部盆地和田边湾的地表水样本，结果发现磷酸盐浓度分别为3.68和4.31 nmol dm^-3。
Phosphate, 3–10 nmol, in 1 dm^3 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.