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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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one publication added to basket [7858]
A room temperature procedure for the manual determination of urea in seawater Goeyens, L.; Kindermans, N.; Yusuf, M.A.; Elskens, M. (1998). A room temperature procedure for the manual determination of urea in seawater. Est., Coast. and Shelf Sci. 47(4): 415-418 In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015, meer

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 7858 [ download pdf ]

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Trefwoorden

Analysis > Water analysis Chemical compounds > Organic compounds > Urea Organic matter > Carbon > Organic carbon > Dissolved organic matter > Dissolved organic carbon Properties > Physical properties > Thermodynamic properties > Temperature Water > Sea water Marien/Kust

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Auteurs		Top
Goeyens, L., meer Kindermans, N. Yusuf, M.A. Elskens, M., meer

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Abstract

Several earlier studies underpin the important role of dissolved organic matter and more particularly urea in phytoplanktonic nitrogen uptake fluxes. Generally, the determination of urea concentrations relies on the formation of an imidazolone-thiosemicarbizide complex, a complexation which requires very accurate temperature control when carried out at high temperature. It is also possible, however, to obtain reliable results with a room temperature procedure. The measured abundances for both complexation at high temperature (85 degree C, 20 min) and at ambient temperature (22 degree C, 72 h) are closely comparable. Lower values are observed for temperatures <10 degree C though. Moreover, a comparison of both techniques reveals similar precision (coefficient of variation: 2%), sensitivity (slope of calibration line: 0.2) and detection limit (0.14 mM). The room temperature alternative to the earlier described method is therefore a handy tool for urea analyses, when a strict temperature control is difficult or impossible.

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