Direct determination of phosphate in soil extracts by potentiometric flow injection using a cobalt wire electrode

被引：33

作者：

Chen, ZL ^{[1
]}

Grierson, P ^{[1
]}

Adams, MA ^{[1
]}

机构：

[1] Univ Western Australia, Dept Bot, Nedlands, WA 6907, Australia

来源：

ANALYTICA CHIMICA ACTA | 1998年 / 363卷 / 2-3期

基金：

澳大利亚研究理事会;

关键词：

flow injection; cobalt wire electrode; phosphate; soil extracts;

D O I：

10.1016/S0003-2670(98)00137-8

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A system is described for the direct potentiometric flow injection analysis of phosphates using a cobalt wire electrode. It is proposed that the electrode response to phosphate is a result of CO3(PO)(2) precipitate formation at the electrode surface. The electrode response to phosphate was found to be depend on the phthalate concentration, carrier pH, flow rate and injected volume. A linear response with a slope of -41+/-0.5 mV/decade was obtained in the concentration range of 1.0x10(-5) -5.0x10(-3) M with a detection limit of 1x10(-6) M, using a carrier solution containing 25 mM potassium hydrogen phthalate at pH 4.0. The proposed method was used for the determination of soil extracts with a fast analysis, low cost, high sensitivity and selectivity. (C) 1998 Elsevier Science B.V.

引用

页码：191 / 197

页数：7

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