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  • 551.9  (20)
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  • 2020-2024
  • 2020-2023
  • 2010-2014  (20)
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  • 2010  (20)
  • 1936
  • 1
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    Biogeochemie gelöster Kohlenhydrate in der Arktis (2010)
    Univ. Bremen
    Details
    Publication Date: 2021-03-29
    Description: thesis
    Keywords: 551.9 ; VJE 200 ; VJC 210 ; Geochemie Lebender Materie ; Geochemie des Meerwassers
    Language: English
    Type: monograph , publishedVersion
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  • 2
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    Methane oxidation and carbon assimilation in marine sediments (2010)
    Univ. Bremen
    Details
    Publication Date: 2021-03-29
    Description: Anaerobe Oxidation of Methane, AOM, methanotrophy, stable isotope labeling, stable isotope probing, carbon assimilation, flow-through columns, ANME, Seep-SRB, Gullfaks, Tommeliten. - Anaerobic oxidation of methane (AOM) performed by consortia of methanotrophic archaea (ANME) and sulfate reducing bacteria (SRB) is the major sink of methane in marine sediments. This thesis describes methane consumption at two of the most active North Sea cold seeps (Gullfaks, Tommeliten), their microbial community and the resulting lipid biomarker patterns. Experiments in flow-through setups are presented, focusing on physiological parameters of AOM activity such as different methane and sulfate concentrations and on the tolerance of AOM to starvation periods. The roles of inorganic carbon (DIC) and methane as carbon sources for the microbial community performing AOM were examined combining stable isotope probing and lipid biomarker analyses. For archaea substantial uptake of carbon from DIC and methane was found, indicting a novel carbon assimilation pathway. Biomass from SRB was exclusively labeled by DIC indicating a methane dependent, but autotrophic growth consortial SRB.
    Description: thesis
    Keywords: 551.9
    Language: English
    Type: monograph , publishedVersion
    Format: 153 S.
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  • 3
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    Comments on "Comparison of reductive dechlorination of p-chlorophenol using Fe0 and nanosized Fe0 by R. Cheng, et al. [J. Hazard. Mater. 144 (2007) 334] (2010)
    Details
    Publication Date: 2021-03-29
    Description: research
    Keywords: 551.9 ; VJF 000 ; Umweltgeochemie insgesamt
    Language: English
    Type: article , publishedVersion
    Format: 6 S.
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  • 4
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    Comments on: "Sorption of triazoles to soil and iron minerals" by Y. Jia et al. [Chemosphere 67 (2007) 250258] (2010)
    Details
    Publication Date: 2021-03-29
    Description: This letter suggests possible improvements on the discussion of the adsorptive removal of triazoles by iron minerals which are possible corrosion products of elemental iron materials (Fe0) in a recent article by Jia et al. [Jia, Y., Aagaard, P., Breedveld, G.D., 2007. Sorption of triaxoles to soil and iron materials. Chemosphere 67, 250258]. Also recalled is the importance of the adsorption of organics by iron corrosion products which is not properly addressed in the iron technology literature when the contaminants are redox-sensitive.
    Description: Keywords: Adsorption; Elemental iron; Iron corrosion; Iron oxyhydroxides; Triazoles
    Description: research
    Keywords: 551.9 ; VJF 000 ; Umweltgeochemie insgesamt
    Language: English
    Type: article , publishedVersion
    Format: 12 S.
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  • 5
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    Characterizing As, Cu, Fe and U solubilization by natural waters (2010)
    Springer-Verlag, Berlin/Heidelberg | Springer, Berlin/Heidelberg
    Details
    Publication Date: 2021-03-29
    Description: The effects of carbonate concentration and the presence of in-situ generated iron oxide and hydroxide phases (iron oxyhydroxides) on arsenic (As), copper (Cu), and uranium (U) release from natural rocks were investigated under oxic conditions and in the pH range from 6 to 9. For this purpose non-disturbed batch experiments were conducted with a constant amount of each contaminant bearing rock/mineral and different types of water (deionised, mineral, spring, and tap water). For comparison parallel experiments were conducted with 0.1 M Na2CO3 and 0.1 M H2SO4. The favourable role of carbonate bearing minerals for U and Cu transport could not be confirmed by using dolomite. The presence of elemental iron and pyrite retards As, Cu and U solubilization. This study shows that using natural materials in laboratory investigations is a practical tool to investigate natural processes.
    Description: research
    Keywords: 551.9 ; VJF 000 ; Umweltgeochemie insgesamt
    Language: English
    Type: article , draft
    Format: 10 S.
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  • 6
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    Investigating the mechanism of Uranium removal by zerovalent iron (2010)
    Details
    Publication Date: 2021-03-29
    Description: Zerovalent iron (ZVI) has been proposed as a reactive material in permeable in situ walls for groundwater contaminated by metal pollutants. For such pollutants that interact with corrosion products, the determination of the actual mechanism of their removal is very important to predict their stability in the long term. From a study of the effects of pyrite (FeS2) and manganese nodules (MnO2) on the uranium removal potential of a selected ZVI material, a test methodology (FeS2MnO2 method) is suggested to follow the pathway of contaminant removal by ZVI materials. An interpretation of the removal potential of ZVI for uranium in the presence of both additives corroborates coprecipitation with iron corrosion products as the initial removal mechanism for uranium.
    Description: Keywords: iron, redox reactions, uranium, water treatment
    Description: research
    Keywords: 551.9 ; VJF 000 ; Umweltgeochemie insgesamt
    Language: English
    Type: article , publishedVersion
    Format: 22 S.
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  • 7
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    Pedogenic carbonates as a proxy for palaeo-CO2 in the Palaeozoic atmosphere (2010)
    Elsevier
    Details
    Publication Date: 2021-03-29
    Description: According to a model by Cerling (1991, 1999), the carbon isotope composition of calcretes should depend on the soil type and the CO2-concentration in the atmosphere. We have tested Cerling’s model by investigating 14 Palaeozoic sections with soil profiles. A large number of carbonate types of different genetic origin exist in the localities examined. Comparing the Palaeozoic samples with recent and subrecent calcretes, it can be demonstrated that anhedral, cryptocrystalline (〈10 μm) and subhedral microcrystalline (10 - 40 μm) carbonates are clearly of pedogenic origin. Crystals of larger size with a poikilotopic texture are of groundwater or burial diagenetic origin. Macro- and micromorphological features, typical of recent calcretes, occur in several soil profiles, but thin section microscopy reveals a strong diagenetic overprint of most pedogenic carbonates. Time equivalent sections with comparable soil types (protosols, calcisols and vertisols) show large variations in carbon isotope composition. On the other hand, different carbonate generations at one site do not differ much. Therefore Palaeozoic calcretes appear to be unsuitable for a deduction of the Palaeozoic CO2-concentration.
    Description: German Research Foundation (DFG)
    Description: research
    Keywords: 551.9 ; 552.5 ; VKB 350 ; VJJ 110 ; VCA 300 ; VKB 332 ; VKA 300 ; VKB 371 ; VEA 000 ; VKB 372 ; Lithogenese {Sedimentologie} ; Geochemie der Stabilen Isotopen ; Paläozoische Geologie ; Sedimentationsbedingungen ; Petrogenese ; Klastische Sedimentgesteine ; Europa insgesamt {Geologie} ; Karbonatische Sedimentgesteine ; Kohlenstoffkreislauf ; C-isotope ; Jungpaläozoikum ; Paläopedologie ; Kalkkruste ; CO2 ; calcrete ; carbon cycle ; upper Paleozoic ; paleosol ; C-13/C-12 ; Europa ; paläoklima ; Europe ; 38.41 ; 38.61 ; 38.32
    Language: English
    Type: article
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  • 8
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    Comments on 'Reply to Comments on comparison of reductive dechlorination of p-chlorophenol using Fe0 and nanosized Fe0' by Wang & Cheng, Journal of hazardous materials (2007) (2010)
    Details
    Publication Date: 2021-03-29
    Description: research
    Keywords: 551.9 ; VJF 000 ; Umweltgeochemie insgesamt
    Language: English
    Type: article , publishedVersion
    Format: 3 S.
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  • 9
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    Investigating the release of coprecipitated uranium from iron oxides (2010)
    Details
    Publication Date: 2021-03-29
    Description: The removal of uranium (VI) from zerovalent iron permeable reactive barriers and wetlands can be explained by its association with iron oxides. The long term stability of immobilized U is yet to be addressed. The present study investigates the remobilization of U(VI) from iron oxides via diverse reaction pathways (acidification, reduction, complex formation). Prior, uranium coprecipitation experiments were conducted under various conditions. The addition of various amounts of a pH-shifting agents (pyrite), an iron complexing agent (EDTA) or iron (III) reduction agent (TiCl3) yielded in uranium remobilization, concentrations above the US EPA allowedmaximum contaminant level(MCL=30 æg/l). This study demonstrates that U(VI) release in nature strongly depends on the conditions and the mechanism of its fixation by geological materials.
    Description: research
    Keywords: 551.9 ; VJF 000 ; Umweltgeochemie insgesamt
    Language: English
    Type: article , publishedVersion
    Format: 23 S.
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  • 10
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    Elemental iron (Fe0) for better drinking water in rural areas of developing countries (2010)
    Springer, Berlin/Heidelberg
    Details
    Publication Date: 2021-03-29
    Description: Many of the reasons behind the anthropogenic contamination problems in rural environments of developing countries lie in changes in the traditional way of life and the ignorance on the toxic potential of introduced manufactured products. A generalization trend exists within the international community suggesting that water in developing countries is of poor quality. However, the water quality is rarely analytically determined. Existing potabilization solutions may be prohibitively expensive for the rural populations. Therefore, efficient and affordable technologies are still needed to ameliorate the water quality. In the recent two decades,elemental iron has shown the capacity to remove all possible contaminants (including viruses) from the groundwater. This paper presents a concept to scale down the conventional iron barrier technology to meet the requirements of small communities and households in rural environments worldwide.
    Description: research
    Keywords: 551.9 ; VJF 000 ; Umweltgeochemie insgesamt
    Language: English
    Type: article , draft
    Format: 9 S.
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