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Photo-Cured Ammonium and Hydrogen Ion Selective Coated-Wire Electrodes Used Simultaneously in a Portable Battery-Powered Flow Injection Analyzer

Citation

Alexander, PW and Dimitrakopoulos, T and Hibbert, DB, Photo-Cured Ammonium and Hydrogen Ion Selective Coated-Wire Electrodes Used Simultaneously in a Portable Battery-Powered Flow Injection Analyzer, Electroanalysis, 9, (17) pp. 1331-1336. ISSN 1040-0397 (1997) [Refereed Article]

DOI: doi:10.1002/elan.1140091706

Abstract

Nonactin and N,N-dioctadecylmethylamine ionophores, each in an epoxydiacrylate polymer, were photo-cured on silver wires (0.8 mm i.d.) and evaluated as ammonium and hydrogen (pH) coated wire electrodes. The photo-cured membranes prepared in this study exhibited excellent adhesion to the metal substrate and improved mechanical strength compared to PVC based membranes. The ammonium electrode exhibited a Nernstian response over a concentration range between 0.01 mM and 100 mM with a detection limit of 0.0005 mM. The ammonium electrode exhibited improved selectivity against most common interfering ions, including potassium compared to previous studies. The hydrogen selective electrode exhibited a near-Nernstian slope of 55.9± 0.8 mV change/log a(H+) between pH 4.0 and pH 11.0 in the steady-state mode. The ammonium and pH sensors each responded quickly reaching 90 % of steady-state value in < 5 s, making these coated wire sensors ideal for flow injection potentiometry measurements. In the FIP mode, both the photo-cured ammonium and pH electrodes exhibited near-Nernstian responses of 49.2 ± 1.0 mV change / activity decade and 50.2 ± 0.4 mV change / log a(H+), respectively, over a similar concentration range as in the steady-state mode. The photo-cured ammonium and pH electrodes were used simultaneously in the analysis of hydroponic nutrient solutions and waste water samples obtained from a local greenhouse grower in the flow injection potentiometric mode.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Instrumental Methods (excl. Immunological and Bioassay Methods)
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Alexander, PW (Professor Peter Alexander)
Author:Dimitrakopoulos, T (Mr Telis Dimitrakopoulos)
ID Code:12288
Year Published:1997
Web of Science® Times Cited:13
Deposited By:Applied Science
Deposited On:1997-08-01
Last Modified:2011-08-15
Downloads:0

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