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  • 1
    Electronic Resource
    Electronic Resource
    Impacts of environmental changes on the biogeochemistry of aquatic humic substances (1992)
    Springer
    Hydrobiologia 229 (1992), S. 59-71 
    Details
    ISSN: 1573-5117
    Keywords: humic substances ; aquatic ecosystems ; biogeochemistry ; acidification ; eutrophication ; UV radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Humic substances (HS) are the main constituent of the organic carbon pool in stained aquatic ecosystems. HS absorb visible and ultraviolet (UV) light, have acid-base properties and metal and nutrient binding abilities. Based on these characteristics, UV irradiation, pH and the trophic status of aquatic ecosystems will influence the impact of HS on element cycling in surface waters. With climatic change and environmental pollution, UV irradiance, acidification and eutrophication may increase further. In this paper impacts of UV irradiation, pH and eutrophication on the structure, properties and biodegradation of aquatic HS are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006991
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Size distribution of dissolved (〈200 nm) organic carbon and aluminium in alkaline and humic lakes (1991)
    Springer
    Aquatic ecology 24 (1991), S. 145-151 
    Details
    ISSN: 1573-5125
    Keywords: Ultrafiltration ; Size distribution ; speciation ; aluminium ; dissolved organic carbon ; humic substances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chemical equilibrium calculations treating humic substances as the simple diprotic phtalic acid, predicted no Al-humus at pH〉6.5 in humic lake water. However, dissolved (〈200 nm) organic carbon (DOC) and dissolved Al appeared to be linearly (r=0.597, P〈0.001) correlated in samples from five different humic surface waters in The Netherlands with a DOC range of 10–36 mg.l−1 and a (mean) pH range of 6.85–8.47. Yet, organic carbon (Corg) and Al did no exhibit similar size distributions between 5 and 200 nm revealed by ultrafiltration. Averaged 25% of the Corg and 〉50% of the Al occurred in the fraction 〈5 nm. Only in this fraction the Corg and Al were linearly correlated (r=0.515, P〈0.001). This result suggests the presence of organic ligands in the DOC pool of humic waters having smaller molecular sizes and higher Al stability constants than the humic substances used to model aquatic Al speciation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02260432
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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