LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 3 of total 3

Search options

  1. Article: Iron Species Determination to Investigate Early Diagenetic Reactivity in Marine Sediments

    Haese, R. R. / Wallmann, K. / Dahmke, A. / Kretzmann, U. / Mueller, P. J. / Schulz, H. D.

    1997  , Page(s) S. 63–72

    Keywords Eisen ; Bestimmungsmethode ; Biochemische Reaktion ; Meeressediment ; Meeresboden ; Sedimentanalyse ; Sediment ; Kenngroesse ; Spektralanalyse ; Magnesium ; Mineralogie ; Mineral ; Porenwasser ; Konzentrationsmessung ; Extraktion ; Analysenverfahren ; Mineralstoff ; Tiefsee ; Erdgeschichte ; Eisenverbindung ; Meeresgeologie ; Speziation (Chemie) ; Chemische Umwandlung ; Stratigraphie ; Pyrit
    Language English
    Document type Article
    Database OPAC and Environmental database (ULIDAT) of The Federal Environment Agency (UBA)

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  2. Article ; Online: Iron species determination to investigate early diagenetic reactivity in marine sediments

    Haese, R.R. / Wallmann, Klaus / Dahmke, A. / Kretzmann, U. / Müller, P.J. / Schulz, H.D.

    1997  

    Abstract: Iron speciation was determined in hemiplegic sediments from a high productivity area to investigate systematically the early diagenetic reactivity of Fe. A combination of various leaching agents (1 M HCI, dithionite buffered in citrate/acetic acid, HF/ ... ...

    Abstract Iron speciation was determined in hemiplegic sediments from a high productivity area to investigate systematically the early diagenetic reactivity of Fe. A combination of various leaching agents (1 M HCI, dithionite buffered in citrate/acetic acid, HF/H2SO4, acetic Cr(II)) was applied to sediment and extracted more than 80% of total Fe. Subsequent Fe species determination defined specific mineral fractions that are available for Fe reduction and fractions formed as products of Fe diagenesis. To determine the Fe speciation of (sheet) silicates we explored an extraction procedure (HF/H2SO4) and verified the procedure by application to standard rocks. Variations of Fe speciation of (sheet) silicates reflect the possible formation of Fe-bearing silicates in near surface sediments. The same fraction indicates a change in the primary input at greater depth, which is supported by other parameters. The Fe(II)/ Fe(III) -ratio of total sediment determined by extractions was compared with Mössbauer-spectroscopy ] at room temperature and showed agreement within 10%. M6ssbauer-spectroscopy indicates the occurrence of siderite in the presence of free sulfide and pyrite, supporting the importance of microenvironments during mineral formation. The occurrence of other Fe(II) bearing minerals such as ankerite (Ca-, Fe-, Mg-carbonate) can be presumed but remains speculative.
    Subject code 550
    Language English
    Publisher Elsevier
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Book ; Online: Iron and carbon geochemistry of sediment core GeoB1401-4, supplementary data to: Haese, Ralf R; Wallmann, Klaus; Dahmke, Andreas; Kretzmann, U; M?ller, Peter J; Schulz, Horst D (1997): Iron species determination to investigate early diagenetic reactivity in marine sediments. Geochimica et Cosmochimica Acta, 61(1), 63-72

    Dahmke, Andreas / Haese, Ralf R / Kretzmann, U / M?ller, Peter J / Schulz, Horst D / Wallmann, Klaus

    1997  

    Abstract: Iron speciation was determined in hemiplegic sediments from a high productivity area to investigate systematically the early diagenetic reactivity of Fe. A combination of various leaching agents (1 M HCI, dithionite buffered in citrate/acetic acid, HF/ ... ...

    Abstract Iron speciation was determined in hemiplegic sediments from a high productivity area to investigate systematically the early diagenetic reactivity of Fe. A combination of various leaching agents (1 M HCI, dithionite buffered in citrate/acetic acid, HF/H2SO4, acetic Cr(II)) was applied to sediment and extracted more than 80% of total Fe. Subsequent Fe species determination defined specific mineral fractions that are available for Fe reduction and fractions formed as products of Fe diagenesis. To determine the Fe speciation of (sheet) silicates we explored an extraction procedure (HF/H2SO4) and verified the procedure by application to standard rocks. Variations of Fe speciation of (sheet) silicates reflect the possible formation of Fe-bearing silicates in near surface sediments. The same fraction indicates a change in the primary input at greater depth, which is supported by other parameters. The Fe(II)/ Fe(III) -ratio of total sediment determined by extractions was compared with M?ssbauer-spectroscopy ] at room temperature and showed agreement within 10%. M6ssbauer-spectroscopy indicates the occurrence of siderite in the presence of free sulfide and pyrite, supporting the importance of microenvironments during mineral formation. The occurrence of other Fe(II) bearing minerals such as ankerite (Ca-, Fe-, Mg-carbonate) can be presumed but remains speculative.

    REFERENCE:
    Haese, Ralf R (1997): Beschreibung und Quantifizierung fr?hdiagenetischer Reaktionen des Eisens in Sedimenten des S?datlantiks. Berichte aus dem Fachbereich Geowissenschaften der Universit?t Bremen, 99, 118 pp
    Language English
    Dates of publication 1997-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is cited by urn:urn:nbn:de:gbv:46-ep000102231 ; This dataset is supplement to doi:10.1016/S0016-7037(96)00312-2
    DOI 10.1594/PANGAEA.730424
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

To top