Construction and evaluation of an ammonium tubular ion-selective electrode with ionophore nonactin.

被引：0
|
作者：
Junior, LR [1 ]
Neto, GD [1 ]
Lima, JLFC [1 ]
Montenegro, MCBSM [1 ]
机构：
[1] UNIV PORTO, FAC FARM, DEPT QUIM FIS, P-4100 OPORTO, PORTUGAL
来源：
QUIMICA NOVA | 1996年 / 19卷 / 05期
关键词：
tubular electrode; ammonium determination; nonactin;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
This paper describes the construction of an ammonium tubular potentiometric detector for flow injection analisys (FIA) in which the high molecular weight polyvinyl chloride (PVC) membrane is applied directly on a conducting support consisting of a mixture of an epoxy resin and graphite. The tubular ammonium ion-selective electrode, without internal reference solution, is based on nonactin as the ionophore and bis-(2-ethylhexyl)-adipate as plasticiser solvent, supported upon a PVC membrane, The electrode exhibited a response of 55.6 mV per concentration decade within the 5.0x10(-5) to 1.0x10(-1) mol/L NH4+ range in TRIS-HCl 0.2 mol/L (pH=6.7) buffer. Potassium ions constituted the greatest analytical interference; the electrode response time was 10 seconds, at 25.0 degrees C.
引用
收藏
页码：549 / 553
页数：5
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