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  • 1
    Language: English
    In: Science of the Total Environment, 01 April 2013, Vol.449, pp.63-70
    Description: Increasing arsenic concentrations in freshwater ecosystems is of global concern. Processes affecting arsenic fluxes in catchments are known. These processes are in turn controlled by the underlying geology and air pollution history. In contrast to the knowledge on catchment processes less is known about the hydrochemical processes controlling the fixation/remobilization of arsenic within lakes and artificial reservoirs. Consequently, we examined a reservoir system in the Ore Mts. (Germany) regarding its sink and source potentials affecting arsenic fluxes. This area was faced with heavy deposition inputs from coal burning based acid rain until the beginning of the 1990s. Hereafter concentrations of sulfate and nitrate in runoff waters decreased, whereas dissolved organic carbon (DOC) concentrations are still increasing. Along with this, arsenic concentrations in the water discharge from the catchments increase. Our results reveal that the sediments of the investigated reservoir system contain high inventories of arsenic in association with ferric and organic phases. A nitrate deficit dependent arsenic release is suggested. It is indicated that arsenic release from the reservoir sediments may be controlled by water nitrate concentration, which in turn is dependent on the nitrate concentration in the runoff water from the catchment. ► We examine increasing dissolved arsenic in water reservoirs. ► Arsenic release from sediments was controlled by decreasing water nitrate concentration. ► Basin sediment arsenic was found in ferric and humic matter. ► A long term trend of arsenic in water is negatively related to nitrate.
    Keywords: Arsenic Fluxes ; Iron ; Metalloid ; Nitrate ; Sediments ; Environmental Sciences ; Biology ; Public Health
    ISSN: 0048-9697
    E-ISSN: 1879-1026
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  • 2
    In: Environmental Science: Processes & Impacts, 2013, Vol.15(12), pp.2297-2303
    Description: Metal and metalloid mobilization processes within seepage water are of major concern in a range of water reservoir systems. The mobilization process of arsenic and heavy metals within a dam and sediments of a drinking water reservoir was investigated. Principle component analysis (PCA) on time series data of seepage water showed a clear positive correlation of arsenic with iron and DOC (dissolved organic carbon), and a negative correlation with nitrate due to respiratory processes. A relationship of reductive metal and metalloid mobilization with respiration of old carbon was shown. The system is influenced by sediment layers as well as a recent DOC input from degraded ombrotrophic peatbogs in the catchment area. The isotopic composition ( 12 C, 13 C and 14 C) of DOC is altered along the path from basin to seepage water, but no significant changes in structural parameters (LC-OCD-OND, FT-IR) could be seen. DIC (dissolved inorganic carbon) in seepage water partly originates from respiratory processes, and a higher relationship of it with sediment carbon than with the DOC inventory of infiltrating water was found. This study revealed the interaction of respiratory processes with metal and metalloid mobilization in sediment water flows. In contrast to the presumption that emerging DOC via respiratory processes mainly controls arsenic and metal mobilization it could be shown that the presence of aged carbon compounds is essential. The findings emphasize the importance of aged organic carbon for DOC, DIC, arsenic and metal turnover.
    Keywords: Sediment Pollution ; Arsenic ; Water Reservoirs ; Dissolved Inorganic Carbon ; Respiration ; Organic Carbon ; Dissolved Organic Carbon ; Seepages ; Metabolism ; Metals ; Arsenic ; Water Flow ; Respiration ; Organic Carbon ; Time Series Analysis ; Sediments ; Rare Earth Elements ; Carbon ; Dissolved Organic Carbon ; Seepages ; Drinking Water ; Reservoirs ; Iron ; Metals ; Arsenic ; Carbon ; Respiration ; Organic Carbon ; Flow Discharge ; Seepage ; Reservoirs ; Sediments ; Metals ; Arsenic ; Carbon ; Respiration ; Organic Carbon ; Flow Discharge ; Seepage ; Reservoirs ; Sediments ; Renewable Resources-Water ; Water Treatment and Distribution ; Water Resources and Supplies ; Characteristics, Behavior and Fate;
    ISSN: 2050-7887
    E-ISSN: 2050-7895
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  • 3
    Language: English
    In: Water, Air, & Soil Pollution, 2017, Vol.228(8), pp.1-16
    Description: Arsenic concentrations in a drinking water reservoir system in the Eastern Ore mountains (Osterzgebirge, Germany) were observed over a 17-year period. The region experienced an environmental change during the past 20 years with decreasing acid, sulphur and nitrogen deposition and a recovering vitality of forested catchment sites. An increase of the arsenic content in the reservoir waters during that change was observed. This was caused by a diminished nitrate supply leading to lower redox potential in the sediments favouring sediment arsenic release. The recent annual cycle in the Altenberg reservoir water arsenic concentration was found to be independent from artificial aeration of the hypoxic hypolimnion during the summer stratification. However, we found a strong seasonal dependent change in water As concentration, with a maximum in autumn and a minimum in spring. The low productive system is driven by peat derived organic matter. For the recent arsenic catchment yield coherencies to dissolved organic carbon export and runoff intensity were found, indicating rising arsenic loads due to climate-related soil organic matter destabilization. Thus, in the reservoir system, both dry and wet climate conditions can increase the water As concentrations due to an internal arsenic release and a catchment arsenic import.
    Keywords: Acidification recovery ; Arsenic fluxes ; DOC ; Global change ; Nitrate ; Precipitation extremes
    ISSN: 0049-6979
    E-ISSN: 1573-2932
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  • 4
    Language: German
    In: WASSERWIRTSCHAFT, 5/2013, Vol.103(5), pp.32-35
    Keywords: Environmental Geology ; Central Europe ; Climate Change ; Climate Effects ; Drinking Water ; Europe ; Germany ; Reservoirs ; Risk Assessment ; Surface Water ; Temperature ; Water Management ; Water Quality ; Water Supply;
    ISSN: 0043-0978
    E-ISSN: 2192-8762
    Source: CrossRef
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  • 5
    Language: English
    In: Environmental Monitoring and Assessment, 2016, Vol.188(12), pp.1-10
    Description: Wetlands fed by rivers can be a sink for elements depending on elemental concentrations, wetland hydrology, geochemistry, vegetation and climate. In the case of the Okavango Delta, northern Botswana, the outflow discharge is a small fraction (2–5%) of the inflow. This has strong potential consequences for the Delta, as it strongly affects element cycling and storage within the Delta. We estimated the inputs, behaviour and distribution of multiple elements along a longitudinal transect within the Okavango Delta, to show potential effects of retention mechanisms of different elements. High annual element input is rather attributed to discharge than to the concentration within the water, which is generally extremely low. We observed minimal enrichment of the elements within the water pathway along the transect from inflow to outlets, implying that element output is negligible. For most elements, we observed a high correlation between storage and sediment organic matter content. The organic matter content within the sediments was higher in the vegetated sediments than in non-vegetated sediments (factor ∼ 10), and a similar trend was found for most elements. In conclusion, organic matter dominated in sediments from vegetated plots and thus plays an important role in retaining the elements within the sediments of the Delta. This finding has major implications for e.g. planning constructed wetlands for water purification or element retention especially in areas with high evapotranspiration.
    Keywords: Aquatic ecosystem ; Carbon pools ; Element accumulation ; Organic rich sediments ; Wetland ; Macrophytes
    ISSN: 0167-6369
    E-ISSN: 1573-2959
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