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Type: Artigo de periódico
Title: Construction and evaluation of an ammonium tubular ion-selective electrode with ionophore nonactin.
Author: Junior, LR
Neto, GD
Lima, JLFC
Montenegro, MCBSM
Abstract: 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.
Subject: tubular electrode
ammonium determination
Country: Brasil
Editor: Soc Brasileira Quimica
Citation: Quimica Nova. Soc Brasileira Quimica, v. 19, n. 5, n. 549, n. 553, 1996.
Rights: aberto
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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