Composition and transport of settling particles in Lake Zurich: relative importance of vertical and lateral pathways     

Erich Wieland  Peter Lienemann  Silvia Bollhalder  Alfred Lück  Peter H. Santschi 《Aquatic Sciences - Research Across Boundaries》2001,63(2):123-149

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Identification of stoichiometric iron-phosphorus colloids produced in a eutrophic lake     

Charles-Philippe Lienemann  Marc Monnerat  Janusz Dominik  Didier Perret 《Aquatic Sciences - Research Across Boundaries》1999,61(2):133-149

: Iron-rich colloids formed at the oxic-anoxic interface of a eutrophic lake (Lake Lugano; CH) were characterized by bulk chemical methods and analytical electron microscopy. Fractionation of raw waters showed that non-dissolved iron is particulate above the oxicline and mainly colloidal in the anoxic part of the hypolimnion, while non-dissolved ortho-phosphate is mostly colloidal through the water column. Because of these differences, filtration did not prove helpful for the determination of the role of iron-rich species in the scavenging of ortho-phosphate. On the other hand, analytical electron microscopy revealed that iron-rich nano-granules (ca. 50nm) are associated to the surface of bacterially produced fibrillar polysaccharides. Iron colloids in these complex entities contain important and constant amounts of phosphorus ([PO4]part:[Fe]part = 0.48 - 0.11, n = 1096 Fe-rich entities analyzed by electron microscopy), which suggests that phosphates are stoichiometrically incorporated into the hydrous iron oxide phase, with a tentative composition Fe2[OOH]1-x[(OH)3]x[PO4], during its genesis.  相似文献