Identification of stoichiometric iron-phosphorus colloids produced in a eutrophic lake
Identification of stoichiometric iron-phosphorus colloids produced in a eutrophic lake
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富营养化湖泊中产生的化学计量铁磷胶体的鉴定
DOI：
10.1007/s000270050058
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发表时间：
1999
期刊：
影响因子：
2.4
通讯作者：
D. Perret
中科院分区：
文献类型：
--
作者：
C. Lienemann;M. Monnerat;J. Dominik;D. Perret
富铁胶体形成在富营养化湖泊（卢加诺湖; CH）的缺氧-缺氧界面的特点是散装化学方法和分析电子显微镜。原沃茨的分馏表明，不溶解的铁是颗粒以上的oxicline和主要是胶体在缺氧的部分的hypolimonion，而不溶解的正磷酸盐主要是胶体通过水柱。由于这些差异，过滤并没有证明有助于确定富含铁的物种在清除正磷酸盐中的作用。另一方面，分析电子显微镜显示，富铁纳米颗粒（约。50 nm）与细菌产生的纤维状多糖的表面缔合。这些复杂实体中的铁胶体含有重要且恒定量的磷（[PO 4]部分：[Fe]部分= 0.48 ± 0.11，通过电子显微镜分析n = 1096个富铁实体），这表明磷酸盐在其形成期间化学计量地掺入含水氧化铁相中，具有暂定组成Fe 2 [OOH]1-x[（OH）3]x[PO 4]。
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.