Potentiometric measurement of ascorbate by using a solvent polymeric membrane electrode

被引：18

作者：

Guo, Huimin ^{[1
,2
]}

Yin, Tanji ^{[1
]}

Su, Qingmei ^{[1
]}

Qin, Wei ^{[1
]}

机构：

[1] Chinese Acad Sci, Yantai Inst Coastal Zone Res Sustainable Dev, Environm Chem Lab, Yantai 264003, Peoples R China

[2] Dalian Univ Technol, Sch Chem Engn, Dept Chem, Dalian 116024, Peoples R China

来源：

TALANTA | 2008年 / 75卷 / 03期

关键词：

potentiometry; ion selective electrodes; ion fluxes; polymeric membranes; ascorbate; irreversible chemistries;

D O I：

10.1016/j.talanta.2007.12.023

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A novel potentiometric method for the determination of ascorbate is described in this communication. It is based on ascorbate oxidation with permanganate which is continuously released from the inner reference solution of a ligand-free tridodecylmethyl ammonium chloride (TDMAC)-based polymeric membrane ion selective electrode (ISE). The ISE potential determined by the activity of permanganate ions released at the sample-membrane phase boundary is increased with the consumption of permanganate. The proposed membrane electrode is useful for continuous and reversible detection of ascorbate at concentrations in 0.1 M NaCl ranging from 1.0 x 10(-6) to 1.0 x 10(-3) M with a detection limit of 2.2 x 10(-7) M. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：851 / 855

页数：5

共 31 条

[1] Potentiometric sensors for trace-level analysis [J].