The electrochemical determination of ammonium based on the selective inhibition of the low-spin iron(II)/(III) system of Prussian blue

被引:43
作者
Hermes, M [1 ]
Scholz, F [1 ]
机构
[1] Humboldt Univ, Inst Angew Analyt & Umweltchem, D-10115 Berlin, Germany
关键词
Prussian blue; ammonium; voltammetry; flow-through; Kjeldahl;
D O I
10.1007/s100080050051
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A new method is described for the determination of ammonium in aqueous solutions with electrodes modified by Prussian blue (PB). The specific voltammetric response of PB-modified electrodes to ammonium ions is used for their analytical determination. In the presence of ammonium ions, a concentration-dependent inhibition of the low-spin iron(II/III) system of PB occurs. Only thallium and rubidium ions cause similar inhibition. A useful electrochemical determination method is thus available for detecting ammonium ions in the presence of frequently interfering potassium and sodium ions. Paraffin-impregnated graphite electrodes modified with a mechanically transferred PB layer and bulk-modified PB-composite electrodes are studied. The method is applicable within a concentration range which extends from 4 x 10(-5) mol/l to 10(-2) mol/l NH4+. The composite electrode is used in an electrochemical flow-through system in conjunction with the Kjeldahl method.
引用
收藏
页码:215 / 220
页数:6
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