A miniature and field-applicable multipumping flow analyzer for ammonium monitoring in seawater with fluorescence detection

Burkhard Horstkotte, Carlos Duarte, Víctor Cerd*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

In this article, a simple, economic, and miniature flow analyzer for ammonium in seawater based on the solenoid micropumps is presented. A single reagent of sodium tetraborate, ortho-phthaldialdehyde (OPA), and sodium sulfite was used and optimized applying the modified SIMPLEX method. A special-made detection cell for fluorescence detection of the reaction product isoindol-1-sulfonat was made and combined with a commercial photomultiplier tube, a long-pass optical filter, and an UV-LED as excitation light source. A LOD down to 13 nmol/L was achieved. The fabrication and application of a miniature reaction coil heating device for reaction rate enhancement is further described. The system featured an injection frequency of 32 h-1 at average standard deviation of 3%.

Original languageEnglish (US)
Pages (from-to)380-385
Number of pages6
JournalTalanta
Volume85
Issue number1
DOIs
StatePublished - Jul 15 2011

Keywords

  • Ammonium
  • Fluorescence detection
  • LED excitation
  • Long-pass optical filter
  • Miniature reaction coil thermostat
  • Multipumping flow analysis
  • Photomultiplier
  • Seawater
  • o-phthalaldehyde

ASJC Scopus subject areas

  • Analytical Chemistry

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