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  • 1
    Electronic Resource
    Electronic Resource
    Oxygenation of vanadyl(IV). Effect of coordinated surface hydroxyl groups and hydroxide ion (1988)
    s.l. : American Chemical Society
    Langmuir 4 (1988), S. 753-758 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00081a045
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of the reaction of hydrogen sulfide with lepidocrocite (1992)
    s.l. : American Chemical Society
    Environmental science & technology 26 (1992), S. 2408-2413 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00036a011
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  • 3
    Electronic Resource
    Electronic Resource
    Sedimentary profiles of Fe, Mn, V, Cr, As and Mo as indicators of benthic redox conditions in Baldeggersee (1997)
    Springer
    Aquatic sciences 59 (1997), S. 345-361 
    Details
    ISSN: 1420-9055
    Keywords: Key words: Lake sediments, redox indicators, trace metals, iron, manganese.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Concentration profiles of Mg, K, La, Fe, Mn, V, Cr, As and Mo were determined in samples from a freeze core taken at the deepest site of Baldeggersee in 1993. The special coring technique allowed an exact dating of the sediment samples and an annual resolution of the profiles. Long term changes in benthic redox conditions produce diagnostic trends in several metal profiles. Fe, As and Mn enrichments trace the onset of anoxia at the deepest site of the lake. High values of Mo concentrations and Cr/V ratios indicate periods of stable anoxic conditions in a meromictic hypolimnion. A comparison of oxygen time series with metal profiles between 1950 and 1990 indicates that Mn reacts sensitively to large seasonal variations of deep-water oxygen concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000270050019
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  • 4
    Electronic Resource
    Electronic Resource
    Reconstructing the iron cycle from the horizontal distribution of metals in the sediment of Baldeggersee (1997)
    Springer
    Aquatic sciences 59 (1997), S. 326-344 
    Details
    ISSN: 1420-9055
    Keywords: Key words: Metal distribution, iron cycling, geochemical focusing.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. In Baldeggersee, the distributions of solid phase Fe, Mn, V, Cr, As and Mo were determined in different sediment strata, deposited under various deep-water oxygen conditions. Iron concentrations are correlated with water depth when an anoxic sediment is in contact with an oxic water column. Benthic redox gradients trigger iron transport towards the deepest site (geochemical focusing) and loss of iron from the shallower parts through the outflow. Fe cycling in the lake is inhibited by oxygen penetration into the sediment. Vanadium and arsenic can be used as tracers for the internal Fe cycle. Their distribution patterns are highly correlated with iron. In case of a stable oxycline in the deep water, Mo is enriched in the sediment and correlates with Mn. The horizontal distribution patterns of Fe, V, As and the correlation of Fe and Mn with trace metals are promising proxy indicators for the reconstruction of deep-water oxygen conditions during deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000270050018
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  • 5
    Electronic Resource
    Electronic Resource
    Solute transfer across the sediment surface of a eutrophic lake: I. Porewater profiles from dialysis samplers (1997)
    Springer
    Aquatic sciences 59 (1997), S. 1-25 
    Details
    ISSN: 1420-9055
    Keywords: Key words: Pore water, fluxes, lake.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: ABSTRACT. Porewater profiles often are used to identify and quantify important biogeochemical processes occurring in lake sediments. In this study, multiple porewater profiles were obtained from two eutrophic Swiss lakes using porewater equilibrators (peepers) in order to examine spatial and seasonal trends in biogeochemical processes. Variability in profile shapes and concentrations was small on spatial scales of a few meters, but the uncertainty in calculated diffusive fluxes across the sediment surface was, on average, 35%. Focusing of Fe and Mn oxides toward the lake center resulted in systematic increases in porewater concentrations and diffusive fluxes of Fe2+ and Mn2+ with increasing water depth; these fluxes are postulated to be regulated by the pH-dependent dissolution of reduced-metal phases. Despite higher concentrations of inorganic carbon, NH4 +, Si and P in pelagic compared to littoral sites, diffusive fluxes of these substances across the sediment surface increased only slightly or not at all with increasing water depth. Porewater profiles did reveal temporal changes in Fe2+, Mn2+, Ca2+ and Mg2+ that were an indirect result of the large, seasonal changes in seston deposition, but no clear seasonal variations were found in diffusive fluxes of nutrients across the sediment surface. The intense mineralization occurring at the sediment surface was not reflected in the porewater profiles nor in the calculated diffusive fluxes. Calculated diffusive fluxes across the sediment surface resulted from decomposition occurring primarily in the top 5‐7 cm of sediment. Diffusive fluxes from this subsurface mineralization were equal to the solute release from mineralization occurring at the sediment-water interface. Buried organic matter acts as a memory of previous lake conditons; it will require at least a decade before reductions in nutrient inputs to lakes fully reduce the diffusive fluxes into the lake from the buried reservoir of organic matter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00001302
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  • 6
    Electronic Resource
    Electronic Resource
    Editorial (1993)
    Springer
    Aquatic sciences 55 (1993), S. 229-229 
    Details
    ISSN: 1420-9055
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877267
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  • 7
    Electronic Resource
    Electronic Resource
    Book reviews (1989)
    Springer
    Aquatic sciences 51 (1989), S. 370-371 
    Details
    ISSN: 1420-9055
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877178
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  • 8
    Electronic Resource
    Electronic Resource
    Chemical mechanisms in the dissolution kinetics of minerals; the aspect of active sites (1990)
    Springer
    Aquatic sciences 52 (1990), S. 3-31 
    Details
    ISSN: 1420-9055
    Keywords: Weathering ; dissolution ; active sites ; aluminum minerals ; surface complex formation ; surface structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mechanistic rate laws for the description of mineral dissolution include (often implicitly) the mole fraction of active surface sites. The amount of active sites is first estimated by dissolution experiments in presence of polyvalent cations which inhibit proton-promoted dissolution. The dissolution reactivities of surface Al centers of several minerals and of comparable dissolved polynuclear Al complexes are determined. This comparison offers a second possibility for the indirect estimation of the concentration range of active surface sites. The coordination geometries of surface Al centers, which are given by the crystal lattice network, are considered to determine the reactivity in dissolution processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878239
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  • 9
    Electronic Resource
    Electronic Resource
    Geochemical-focusing of manganese in lake sediments — An indicator of deep-water oxygen conditions (1996)
    Springer
    Aquatic geochemistry 2 (1996), S. 359-378 
    Details
    ISSN: 1573-1421
    Keywords: geochemical-focusing ; manganese ; redox conditions ; lake sediment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The lateral distributions of Mn concentrations in the sediments of two Swiss lakes under varying oxygen conditions have been determined. The comparison of Mn distribution patterns with oxygen in the deep-water provides strong evidence for a geochemical-focusing effect, which is driven by the redox cycle of manganese. Conditions essential for this process to occur are anoxic sediments in contact with oxic deep-water. Average sedimentary manganese concentrations determined for different water-depth ranges are directly proportional to the area of shallower sediments. This result indicates that geochemical-focusing of manganese in lake sediments is a promising proxy indicator for the reconstruction of oxygen conditions during deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115977
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  • 10
    Electronic Resource
    Electronic Resource
    Sources and sinks of nitrous oxide (N2O) in deep lakes (1997)
    Springer
    Biogeochemistry 38 (1997), S. 281-301 
    Details
    ISSN: 1573-515X
    Keywords: aquatic nitrous oxide emissions ; nitrous oxide consumption ; nitrous oxide production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract As reported from marine systems, we found that also in15 prealpine lakes N2O concentrations werestrongly correlated with O2 concentrations. Inoxic waters below the mixed surface layer, N2Oconcentrations usually increased with decreasingO2 concentrations. N2O is produced in oxicepilimnia, in oxic hypolimnia and at oxic-anoxicboundaries, either in the water or at the sediment-waterinterface. It is consumed, however, incompletely anoxic layers. Anoxic water layers weretherefore N2O undersaturated. All studied lakeswere sources for atmospheric N2O, including thosewith anoxic, N2O undersaturated hypolimnia.However, compared to agriculture, lakes seem not tocontribute significantly to atmospheric N2Oemissions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005814020322
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