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Breakdown and production of fluorescent substances in Dutch waters
Postma, H.; Manuels, M.W.; Rommets, J.W. (1976). Breakdown and production of fluorescent substances in Dutch waters. Neth. J. Sea Res. 10(4): 499-516
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Postma, H.
  • Manuels, M.W.
  • Rommets, J.W.

Abstract
    Natural fluorescence in undiluted North Sea water has an average value of 4 mFl with a variation between 2.5 and 5 mFl, the highest values occurring in the summer season. The fluorescence increases towards the Dutch shore by admixture of Rhine water. The Rhine has a fluorescence between 60 and 100 mFl with probably the lowest values in summer. During temporary storage of Rhine water in the IJsselmeer and Haringvliet there is a gradual breakdown of fluorescence; the decrease depends on the residence time in these lakes and proceeds with a velocity of approximately 5 mFl per month. The lowest values in water leaving the lakes are about 30 mFl. The Rhine water discharged directly into the North Sea possibly shows a similar breakdown of fluorescence of about one month. In the inner parts of the Wadden Sea new fluorescent matter is formed, mainly in summer. The regional distribution and the seasonal variation strongly suggest that this material originates from the decay of organic matter in the area. The general conclusion from this study is that fluorescent material is less stable as thought previously.

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