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  • Electronic Resource  (3)
  • isotopes  (2)
  • Isotopenanalyse von Kohlenstoff, Sauerstoff in Magnesit  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Sulfur isotope values in a forested catchment over four years: Evidence for oxidation and reduction processes (1999)
    Springer
    Biogeochemistry 44 (1999), S. 51-71 
    Details
    ISSN: 1573-515X
    Keywords: adsorption ; bacterial dissimilatory sulfate reduction ; dry deposition ; forested catchment ; Lake Gårdsjön ; isotopes ; oxidation of sulfur ; sulfate ; sulfur ; Sweden
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract A small catchment on the Swedish West Coast has been studied over four years to determine S dynamics by using S isotope ratios. A Norway spruce dominated forest covers the catchment, and small peat areas occur in the lower parts of the catchment. The runoff δ34SSO4 values varied both during the year, and from year to year. Over the period from February 1990 to December 1993, the δ34SSO4 values ranged from −1‰ to +11‰. Over the same period, the throughfall δ34SSO4 values ranged from +1‰ to +15‰. There was no correlation (r2 = 0.01; Pr(F) = 0.57) between δ34SSO4 values in throughfall and runoff. Since the only input of S to the catchment is atmospheric deposition, the long-term runoff S mass flux is controlled by the deposition. Therefore, processes in the catchment are responsible for the variation in the runoff δ34SSO4 values. During periods with 34SSO4 enriched runoff, bacterial dissimilatory SO42- reduction occurs in the catchment. After very dry periods, oxidation of this reduced S, which is 32S-enriched, can be traced in runoff. Previous studies of the catchment have not been able to distinguish between: 1) oxidation of reduced S and dry deposition, and 2) reduction and adsorption. From the current study, it can be concluded that adsorption and dry deposition cannot cause the observed variation in runoff δ34SSO4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006030008089
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sulfur isotope values in a forested catchment over four years: Evidence for oxidation and reduction processes (1999)
    Springer
    Biogeochemistry 44 (1999), S. 51-71 
    Details
    ISSN: 1573-515X
    Keywords: adsorption ; bacterial dissimilatory sulfate reduction ; dry deposition ; forested catchment ; Lake Gårdsjön ; isotopes ; oxidation of sulfur ; sulfate ; sulfur ; Sweden
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract A small catchment on the Swedish West Coast has been studied over four years to determine S dynamics by using S isotope ratios. A Norway spruce dominated forest covers the catchment, and small peat areas occur in the lower parts of the catchment. The runoff $$\delta ^{34} S_{SO_4 } $$ values varied both during the year, and from year to year. Over the period from February 1990 to December 1993, the $$\delta ^{34} S_{SO_4 } $$ values ranged from — 1%. to +11%. Over the same period, the throughfall $$\delta ^{34} S_{SO_4 } $$ values ranged from +1%. to +15%. There was no correlation (r 2= 0.01; Pr(F)=0.57) between $$\delta ^{34} S_{SO_4 } $$ values in throughfall and runoff. Since the only input of S to the catchment is atmospheric deposition, the long-term runoff S mass flux is controlled by the deposition. Therefore, processes in the catchment are responsible for the variation in the runoff $$\delta ^{34} S_{SO_4 } $$ values. During periods with $$\delta ^{34} S_{SO_4 } $$ enriched runoff, bacterial dissimilatory SO 4 2− reduction occurs in the catchment. After very dry periods, oxidation of this reduced S, which is32S-enriched, can be traced in runoff. Previous studies of the catchment have not been able to distinguish between: 1) oxidation of reduced S and dry deposition, and 2) reduction and adsorption. From the current study, it can be concluded that adsorption and dry deposition cannot cause the observed variation in runoff $$\delta ^{34} S_{SO_4 } $$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00992998
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Preparation of carbon dioxide from magnesite for isotopic analysis (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 310-311 
    Details
    ISSN: 1618-2650
    Keywords: Isotopenanalyse von Kohlenstoff, Sauerstoff in Magnesit ; Massenspektrometrie ; Freisetzung von CO2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Since the application of the isotope geochemical method to obtain information on the formation mechanism of magnesite deposits was considered promising, we have developed a method to prepare carbon dioxide from magnesite samples for oxygen and carbon isotope analyses, using phosphoric acid reaction at an elevated temperature of 95° C. Data showing the reproducibility of the method (better than ±0.2‰ for both carbon and oxygen) are presented. The oxygen isotope fractionation factor between the evolved CO2 and magnesite at 95° C is 1.0080.
    Notes: Zusammenfassung Mit dem Ziel, durch isotopen-geochemische Untersuchungen den Bildungsmechanismus von Magnesitablagerungen aufzuklären, wurde ein Verfahren zur Freisetzung von Kohlendioxid aus den Magnesitproben zur O- und C-Isotopenanalyse ausgearbeitet. Dazu dient die Reaktion mit Phosphorsäure bei 95° C. Die Reproduzierbarkeit ist besser als ±0,2‰ für beide Elemente. Der Fraktionierungsfaktor für das Sauerstoffisotop zwischen CO2 und Magnesit bei 95° C beträgt 1,0080.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00634505
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    Paper (German National Licenses)
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