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
收藏
页码：191 / 197
页数：7
相关论文
共 28 条
123