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  • PANGAEA  (4)
  • Wiley-Blackwell  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Working Methods Paper: Critical considerations with respect to the identification of tin species in the environment (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 8 (1994), S. 541-549 
    Details
    ISSN: 0268-2605
    Schlagwort(e): Organotin ; identification ; mixed methylbutyl forms ; monophenyltin ; crosscomparison ; mis-interpretation ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Biogeochemical pathways of tin species in the environment are still controversial, e.g. with regard to methylation and transmethylation phenomena, owing to the fact that the identification of methylated tin-compounds is often difficult. The previous tentative identification of a mixed methylbutyltin compound in sediment and biological samples by GC/AAS after hydride generation gave an illustration of this problem. This compound was previously identified in sediments by other authors and also suspected to occur in a contaminated sediment sample from the Boyardville Marina, France. The retention time obtained by GC/AAS corresponded to the actual retention time of a mixed methylbutyltin calibrant. However, additional checks demonstrated that the compound detected was actually monophenyltin. This evidence was produced by a thorough analysis of a selected sediment sample by alternative techniques such as GC/AAS and GC/AES after pentylation, GC/FPD and GC/MS. The results presented highlight the need for a full identification of compounds to avoid mis-interpretation.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aoc.590080607
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Methylation of tin(II) and lead(II) in sediment by carbanion donors (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 1 (1987), S. 115-118 
    Details
    ISSN: 0268-2605
    Schlagwort(e): Factorial experiment ; Methylcobalamin ; Model Cobalamins ; Methyltins ; Methylleads ; Methylmetals ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A factorial experimental design determined separate and combined effects of MeCoB12 (methylcobalamin) and Me2Co(N4)+ (a methylcobalamin model) on methylation of Sn(II) and Pb(II) in sediment matrices. Total methyltin yields ranged from 1.4% to 3.2%, and total methyllead yields varied from 0.037% to 0.11%. No methylmetal products occurred in the absence of Me2Co(N4)+.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aoc.590010203
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    On-Line speciation of mercury and methylmercury in aqueous samples by chromatography-atomic fluorescence spectrometry after hydride generation (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 8 (1994), S. 571-575 
    Details
    ISSN: 0268-2605
    Schlagwort(e): Organometallic speciation ; mercury ; methylmercury ; seawater ; hydride generation ; gas chromatography ; atomic fluorescence spectrometry ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A method is described for the determination of picogram amounts of inorganic mercury(II) and methylmercury(II) compounds in seawater. These compounds are first volatilized from the water samples by reduction to mercury (Hg0) and formation of methylmercury hydride (CH3HgH) by means of a sodium borohydride (NaBH4) solution and cryogenically focused onto a chromatographic stationary phase. Both mercury compounds are eluted according their boiling points and are passed through a pyrolysis tube, at 900°C, before entering the atomic flurescence detector. Absolute detection limits (3σ) are 1 and 2 pg for, respectively, inorganic mercury and methylmercury. For seawater analysis, detection limits of 0.1-1.0 ng I-1 can be achieved.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aoc.590080705
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    facet.materialart.
    Unbekannt
    Iron and aluminium and hydrogen peroxide measured on water bottle samples during Marion Dufresne cruise ANTARES-II (1997)
    PANGAEA
    In:  Supplement to: Sarthou, Géraldine; Jeandel, Catherine; Brisset, Laurence; Amouroux, David; Besson, Thierry; Donard, Olivier F X (1997): Fe and H2O2 distributions in the upper water column in the Indian sector of the Southern Ocean. Earth and Planetary Science Letters, 147(1-4), 83-92, https://doi.org/10.1016/S0012-821X(97)00004-6
    Details
    Publikationsdatum: 2024-02-01
    Beschreibung: Total dissolvable iron (TDFe), particulate iron (PFe) and hydrogen peroxide (H2O2 measurements were performed along a N-S transect in the upper 250 m in the Southern Ocean (62°00E/66°42S - 49°00S, ANTARES II cruise, February 1994). TDFe was organically extracted (APDC/DDDC-chloroform) and analysed by Graphite Furnace Atomic Absorption Spectrometry (GFAAS), PFe was analysed by GFAAS following a strong mixed-acid leach, and H2O2 was analysed on board by fluorometry. The respective detection limits are equal to 0.13 nmol/kg, 0.02 nmol/kg, and 3.0 nmol/kg. TDFe concentrations vary from 0.4 to 6.2 nmol/kg and profiles are not completely depleted in the surface. PFe concentrations vary from 0.02 to 0.2 nmol/kg. Iron/carbon (Fe/C) uptake ratios for phytoplankton were calculated either from seawater or particle measurements. They are variable along the transect but are consistent when they could be compared. All the observed ratios are within the range of values proposed for the Fe/C uptake ratios by phytoplankton. Using our uptake ratio calculated in the Permanent Open Ocean Zone (4 x 10**?6 mol/mol), we estimate that the primary production which can be supported by the iron input flux into the surface waters is two times higher than the measured primary production in the same area. In the surface waters, H2O2 concentrations vary from 5.0 to 19.7 nmol/kg. Such low concentrations are due to strong vertical mixing, low dissolved organic matter concentrations and the latitude of the site.
    Schlagwort(e): Biogeochemical Processes in the Oceans and Fluxes; JGOFS; Joint Global Ocean Flux Study; PROOF
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 5
    facet.materialart.
    Unbekannt
    Particulate iron and aluminum measured on water bottle samples during Marion Dufresne cruise ANTARES-II (1997)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-01
    Schlagwort(e): Aluminium, particulate; ANTARES-II; ANTARES-II_A01; ANTARES-II_A04; ANTARES-II_A06; ANTARES-II_A08; ANTARES-II_A14; ANTARES-II_A18; Biogeochemical Processes in the Oceans and Fluxes; DEPTH, water; Event label; Iron, particulate; JGOFS; Joint Global Ocean Flux Study; Latitude of event; Longitude of event; Marion Dufresne (1972); MD78; OCE; Oceanography; PROOF
    Materialart: Dataset
    Format: text/tab-separated-values, 14 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 6
    facet.materialart.
    Unbekannt
    (Supplementary Table 1) Mercury isotope values for common and thick-billed murre (Uria aalge, Uria lomvia) eggs from Alaska (2011)
    PANGAEA
    In:  Supplement to: Point, David; Sonke, Jeroen E; Day, R D; Roseneau, D G; Hobson, Keith A; Vander Pol, S S; Moors, A J; Pugh, R S; Donard, Olivier F X; Becker, P R (2011): Methylmercury photodegradation influenced by sea-ice cover in Arctic marine ecosystems. Nature Geoscience, 4(3), 188-194, https://doi.org/10.1038/ngeo1049
    Details
    Publikationsdatum: 2023-12-13
    Beschreibung: Atmospheric deposition of mercury to remote areas has increased threefold since pre-industrial times. Mercury deposition is particularly pronounced in the Arctic. Following deposition to surface oceans and sea ice, mercury can be converted into methylmercury, a biologically accessible form of the toxin, which biomagnifies along the marine food chain. Mass-independent fractionation of mercury isotopes accompanies the photochemical breakdown of methylmercury to less bioavailable forms in surface waters. Here we examine the isotopic composition of mercury in seabird eggs collected from colonies in the North Pacific Ocean, the Bering Sea and the western Arctic Ocean, to determine geographical variations in methylmercury breakdown at northern latitudes. We find evidence for mass-independent fractionation of mercury isotopes. The degree of mass-independent fractionation declines with latitude. Foraging behaviour and geographic variations in mercury sources and solar radiation fluxes were unable to explain the latitudinal gradient. However, mass-independent fractionation was negatively correlated with sea-ice cover. We conclude that sea-ice cover impedes the photochemical breakdown of methylmercury in surface waters, and suggest that further loss of Arctic sea ice this century will accelerate sunlight-induced breakdown of methylmercury in northern surface waters.
    Schlagwort(e): Area/locality; Bering Sea; Biological sample; BIOS; Bogoslof_Is; CapeLisburne; Chukchi Sea; DATE/TIME; E-Amatuli_Is; Event label; Gulf of Alaska; International Polar Year (2007-2008); IPY; Latitude of event; Longitude of event; Sample ID; Sample type; Species; Species, common name; StGeorge_Is; StLawrence_Is; StLazaria_Is; Δ199Hg; Δ201Hg; δ199Hg; δ200Hg; δ201Hg; δ202Hg
    Materialart: Dataset
    Format: text/tab-separated-values, 473 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 7
    facet.materialart.
    Unbekannt
    Hydrogen peroxide and total dissolvable iron measured on water bottle samples during Marion Dufresne cruise ANTARES-II (MD78) (1997)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-01
    Schlagwort(e): ANTARES-II; ANTARES-II_A01; ANTARES-II_A04; ANTARES-II_A06; ANTARES-II_A08; ANTARES-II_A10; ANTARES-II_A14; ANTARES-II_A18; Biogeochemical Processes in the Oceans and Fluxes; Date/Time of event; DEPTH, water; Event label; Hydrogen peroxide, water; Iron, soluble; JGOFS; Joint Global Ocean Flux Study; Latitude of event; Longitude of event; Marion Dufresne (1972); MD78; OCE; Oceanography; PROOF; Salinity; Temperature, water
    Materialart: Dataset
    Format: text/tab-separated-values, 197 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
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