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Title (Primary) Sedimentary sulphur:iron ratio indicates vivianite occurrence: a study from two contrasting freshwater systems
Author Rothe, M.; Kleeberg, A.; Grüneberg, B; Friese, K.; Pérez- Mayo, M.; Hupfer, M.;
Journal PLOS ONE
Year 2015
Department SEEFO;
Volume 10
Issue 11
Language englisch;
POF III (all) T31;
UFZ wide themes RU2;
Abstract An increasing number of studies constrain the importance of iron for the long-term retention of phosphorus (P) under anoxic conditions, i.e. the formation of reduced iron phosphate minerals such as vivianite (Fe3(PO4)2⋅8H2O). Much remains unknown about vivianite formation, the factors controlling its occurrence, and its relevance for P burial during early sediment diagenesis. To study the occurrence of vivianite and to assess its relevance for P binding, surface sediments of two hydrologically contrasting waters were analysed by heavy-liquid separation and subsequent powder X-ray diffraction. In Lake Arendsee, vivianite was present in deeper sediment horizons and not in the uppermost layers with a sharp transition between vivianite and non-vivianite bearing layers. In contrast, in lowland river Lower Havel vivianite was present in the upper sediment layers and not in deeper horizons with a gradual transition between non-vivianite and vivianite bearing layers. In both waters, vivianite occurrence was accompanied by the presence of pyrite (FeS2). Vivianite formation was favoured by an elevated iron availability through a lower degree of sulphidisation and was present at a molar ratio of total sulphur to reactive iron smaller than 1.1, only. A longer lasting burden of sediments by organic matter, i.e. due to eutrophication, favours the release of sulphides, and the formation of insoluble iron sulphides leading to a lack of available iron and to less or no vivianite formation. This weakening in sedimentary P retention, representing a negative feedback mechanism (P release) in terms of water quality, could be partly compensated by harmless Fe amendments.
ID 16837
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=16837
Rothe, M., Kleeberg, A., Grüneberg, B, Friese, K., Pérez- Mayo, M., Hupfer, M. (2015):
Sedimentary sulphur:iron ratio indicates vivianite occurrence: a study from two contrasting freshwater systems
PLOS One 10 (11), e0143737