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Journal of Fluorescence

, Volume 20, Issue 1, pp 55–65 | Cite as

A Gas Diffusion Technique Coupled with Flow Injection Systems. Optimization of the Process in its Application to the Fluorimetric Determination of Ammonium in Water Samples

  • María-Jesús Almendral-Parra
  • Ángel Alonso-Mateos
  • María-Socorro Fuentes-Prieto
Original Paper

Abstract

A novel flow injection-gas-diffusion (GD-FI) system has been developed for the on-line analysis of ammonium ion in waters with fluorimetric detection, using an acceptor solution containing the Eosin-Bluish (EB) acid-base indicator. This, together with optimization of the process of gas transfer through the membrane, increases the sensitivity of the method to a considerable extent. Under optimum conditions, it is possible to determine the analyte within the 0.02–1.5 mg l-1 range, with a limit of detection of 5 µg l-1 and relative standard deviations (n = 12, [NH 4 + ] = 50 µg l-1 and 0.05 µg l-1) of 3.4% and 3.0% respectively. The determination rate was 15 samples per hour.

Keywords

Gas-diffusion Flow injection analysis Ammonium determination Eosin bluish Water On-line process analysis 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • María-Jesús Almendral-Parra
    • 1
  • Ángel Alonso-Mateos
    • 1
  • María-Socorro Fuentes-Prieto
    • 1
  1. 1.Departamento de Química Analítica, Nutrición y BromatologíaUniversity of SalamancaSalamancaSpain

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