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|Title:||A miniature and field-applicable multipumping flow analyzer for ammonium monitoring in seawater with fluorescence detection|
|Authors:||Horstkotte, Burkhard; Duarte, Carlos M.; Cerdà, Víctor|
|Citation:||Talanta 85: 380- 385 (2011)|
|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%. © 2011 Elsevier B.V. All rights reserved.|
|Appears in Collections:||(IMEDEA) Artículos|
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