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Talanta. 2011 Jul 15;85(1):380-5. doi: 10.1016/j.talanta.2011.03.078. Epub 2011 Apr 5.

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

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Department of Global Change Research. IMEDEA (CSIC-UIB), Institut Mediterráni d'Estudis Avançats, Miquel Marques 21, 07190 Esporles, Spain.


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%.

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