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  • 1
    Electronic Resource
    Electronic Resource
    Multicomponent kinetic analysis of iron speciation in humic lake Tjeukemeer: comparison of fulvic acid from the drainage basin and lake water samples [Erratum to document cited in CA114(22):213830e] (1991)
    s.l. : American Chemical Society
    Environmental science & technology 25 (1991), S. 1942-1942 
    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/es00023a019
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of dissolved humic substances on the speciation of iron and phosphate at different pH and ionic strength (1993)
    s.l. : American Chemical Society
    Environmental science & technology 27 (1993), S. 1052-1059 
    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/es00043a003
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Multicomponent kinetic analysis of iron speciation in humic Lake Tjeukemeer: comparison of fulvic acid from the drainage basin and lake water samples (1991)
    s.l. : American Chemical Society
    Environmental science & technology 25 (1991), S. 935-939 
    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/es00017a017
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of humic substances on the molecular weight distributions of phosphate and iron in epilimnetic lake waters (2000)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 45 (2000), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The influence of humic substances on the association of free inorganic iron and phosphate with material of larger molecular weight was investigated in epilimnetic samples from two humus-rich lakes of contrasting ionic strength. After modification of the molecular weight distribution of the humic substances in the samples using dialysis and ultrafiltration, the molecular weight distribution of added radioisotopes ( 〈inlineGraphic alt="inline image" href="urn:x-wiley:00465070:FWB634:FWB_634_mu1" location="equation/FWB_634_mu1.gif" extraInfo="missing"/〉 Fe3+ and 〈inlineGraphic alt="inline image" href="urn:x-wiley:00465070:FWB634:FWB_634_mu2" location="equation/FWB_634_mu2.gif" extraInfo="missing"/〉 PO43−) was assessed using gel filtration chromatography. 
2. The association of 〈inlineGraphic alt="inline image" href="urn:x-wiley:00465070:FWB634:FWB_634_mu3" location="equation/FWB_634_mu3.gif" extraInfo="missing"/〉 Fe3+ and 〈inlineGraphic alt="inline image" href="urn:x-wiley:00465070:FWB634:FWB_634_mu4" location="equation/FWB_634_mu4.gif" extraInfo="missing"/〉 PO43− with larger molecular weight fractions (〉50 000 and 10 000–50 000 Da) was not in general related to the quantity of humic substances of the same molecular weight in the samples. However, the proportions of 〈inlineGraphic alt="inline image" href="urn:x-wiley:00465070:FWB634:FWB_634_mu5" location="equation/FWB_634_mu5.gif" extraInfo="missing"/〉 Fe3+ and 〈inlineGraphic alt="inline image" href="urn:x-wiley:00465070:FWB634:FWB_634_mu6" location="equation/FWB_634_mu6.gif" extraInfo="missing"/〉 PO43− observed in higher molecular weight peaks were strongly correlated to the quantity of humic substances of the same molecular weight in (a) the 10 000–50 000 Da peak in the sample of low ionic strength at pH 5.5 and pH 7.0, and (b) the〉 50 000 Da peak in the sample of higher ionic strength at pH 4.0. 
3. It was concluded that humic substances promote the association of 〈inlineGraphic alt="inline image" href="urn:x-wiley:00465070:FWB634:FWB_634_mu7" location="equation/FWB_634_mu7.gif" extraInfo="missing"/〉 Fe3+ and 〈inlineGraphic alt="inline image" href="urn:x-wiley:00465070:FWB634:FWB_634_mu8" location="equation/FWB_634_mu8.gif" extraInfo="missing"/〉 PO43− with higher molecular weight fractions primarily by acting as peptizing agents for inorganic colloids containing Fe and P. Association of 〈inlineGraphic alt="inline image" href="urn:x-wiley:00465070:FWB634:FWB_634_mu9" location="equation/FWB_634_mu9.gif" extraInfo="missing"/〉 Fe3+ and 〈inlineGraphic alt="inline image" href="urn:x-wiley:00465070:FWB634:FWB_634_mu10" location="equation/FWB_634_mu10.gif" extraInfo="missing"/〉 PO43− with material of higher molecular weight via the formation of humic substance-Fe3+–PO43− complexes was identified but only at specific pH and within specific molecular weight ranges for each of the epilimnetic lake water samples studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.2000.00634.x
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  • 5
    Electronic Resource
    Electronic Resource
    Functioning of land-water ecotones in relation to nutrient cycling (1993)
    Springer
    Hydrobiologia 251 (1993), S. 27-32 
    Details
    ISSN: 1573-5117
    Keywords: Land-water ecotone ; phytoplankton ; epiphyton ; metaphyton ; nutrients ; decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Preliminary results of the study on the functioning of the littoral zone of the Gooimeer, The Netherlands, are presented. The results comprise data on the chemical composition of the open water and the aquatic littoral zone, the composition of phytoplankton, metaphyton and epiphyton. On the basis of these data, the Gooimeer littoral zone is characterized as an eutrophic land-water ecotone dominated by a few species of primary producers. Some data on characteristic processes concerning the decomposition of organic matter in rooted littoral sediments are also discussed. Enzyme activities, relevant to mineralization of macrophytic polymers, appear to be highly stimulated in the reed belt of the littoral zone. A first impression of the distribution and the efflux of oxygen in the rhizosphere of reed is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007161
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