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  • bioavailability  (1)
  • phosphate  (1)
  • Springer  (2)
  • 2015-2019
  • 1995-1999  (2)
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  • Springer  (2)
Years
  • 2015-2019
  • 1995-1999  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    A Novel Mixed-Valence Tetranuclear Iron-Oxygen Clusters in the Organically Templated Iron Phosphate [H3N(CH2)2NH3]2 Fe4O(PO4)4 ċH2O (1998)
    Springer
    Journal of porous materials 5 (1998), S. 147-152 
    Details
    ISSN: 1573-4854
    Keywords: phosphate ; iron ; mixed-valence ; template ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A novel iron phosphate templated with ethylenediammonium cation, [H3N(CH2)2NH3]2 Fe4 O(PO4)4ċH2O, has been synthesized hydrothermally and characterized by single-crystal X-ray diffraction, thermo-gravimetric analysis, magnetic susceptibility and Mossbauer spectroscopy. The compound crystallizes in the mono-clinic space group C2 with a= 30.3801(5),b= 10.1204(5),c= 10.0977(5) Å,β = 107.712(1)°, V = 2957.5(4) Å3 and Z = 6. The structure contains 5 and 6-coordinated Fe atoms bridged by μ4-oxygen and PO4 groups to form two types of mixed-valence Fe4P4 cubane-like clusters, which are connected via Fe- O- P bonds to give rise to intersecting channels that house the ethylenediammonium cations and water molecules. Room-temperature Mossbauer data confirm the presence of FeII and FeIII.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009605723397
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of the level of oxygenation in sediment and water on copper bioavailability to marine bivalves: laboratory experiments and translocation experiments in the field (1998)
    Springer
    Hydrobiologia 373-374 (1998), S. 297-310 
    Details
    ISSN: 1573-5117
    Keywords: bivalves ; oxygen ; condition ; copper ; bioavailability ; translocation ; sediment ; silt fraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of differences in the level of oxygenation of sediment or water on the condition and copper content of two bivalves, the Baltic clam Macoma balthica and the cockle Cerastoderma edule, were assessed. Specimens from four intertidal flats in the Netherlands and France were compared, translocated and exposed to different levels of oxygen in the laboratory. Cockles showed no significant differences in condition and copper content between animals from light (= more oxygenated) and dark (= less oxygenated) sediments. Baltic clams also showed no differences in condition, but the clams had a higher copper content (concentration as well as body burden) in dark than in light sediments. During the translocation experiments no significant changes occurred. In the laboratory experiments the level of oxygen had no effect on the condition or copper content of the Baltic clam. The only factor affecting the copper content of Baltic clams was the addition of copper to the water or sediment. The copper, organic carbon and silt fraction (〈 16 µm) was higher in dark sediments than in light sediments. The copper content in the sediment was positively related to the silt and organic carbon content. We argue that the relation between coloration (= degree of oxygenation) of sediments and the copper content of Baltic clams could be indirect: due to a higher silt fraction and/or organic content at some places on a tidal flat, these places are more hypoxic and therefore darker, whereas simultaneously these places have a higher copper concentration because of more copper-complexing sites (and surface), whereby the higher copper concentration in the sediment relates to a higher copper concentration in the clams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017015504106
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    Paper (German National Licenses)
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