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  • Analytical Chemistry and Spectroscopy  (1)
  • Dome C; Dome C, Antarctica; DRILL; Drilling/drill rig; EDC; EDC99; EPICA; EPICA Dome C; European Project for Ice Coring in Antarctica; ICEDRILL; Ice drill  (1)
Document type
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  • 1
    Electronic Resource
    Electronic Resource
    Thermospray mass spectrometry of phosphorothionate pesticides and their oxygen analogues (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 20 (1991), S. 3-10 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Positive and negative ion modes thermospray mass spectrometry were used for the characterization of the phosphorothionate pesticides parathion-ethyl, fenchlorphos, bromophos-ethyl and fenitrothion and their oxygen analogues. A convenient and easy procedure using dimethyldioxirane has been developed for the preparation of the triester phosphates from the corresponding phosphorothionates. The spectra reported from paraoxon-ethyl and fenitrooxon are compared with those of standards available. For the first time, the characterization of the oxygen analogues of fenchlorphos and bromofos-ethyl by any mass spectrometric technique is reported.By employing the positive ion mode, the base peak was [M + NH4]+ for all the studied pesticides with a second abundant ion corresponding to [M + H]+ whereas in the negative ion mode typical negative chemical ionization mechanisms involving electron capture, dissociative electron capture and anion attachment have been observed. The corresponding specific fragments were: [M - R]-, R being a methyl or ethyl; [FG]-, FG being the functional group fragment which contains the phosphorus moiety; M-, [M - Cl]-, phenolate and thiophenolate anions and adducts with the ionizing additive. Special emphasis is given to the changes in the spectra of the phosphorothionate pesticides as compared to their oxygen analogues. With the positive ion mode, sensitivity was about one and a half orders of magnitude better for the oxygen analogues than for the parent pesticides, whereas in the negative ion mode identical sensitivities were observed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200200104
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Data from the EPICA Dome C ice core EDC (2004)
    PANGAEA
    In:  Supplement to: Augustin, Laurent; Barbante, Carlo; Barnes, Piers R F; Barnola, Jean-Marc; Bigler, Matthias; Castellano, Emiliano; Cattani, Olivier; Chappellaz, Jérôme A; Dahl-Jensen, Dorthe; Delmonte, Barbara; Dreyfus, Gabrielle; Durand, Gael; Falourd, Sonia; Fischer, Hubertus; Flückiger, Jacqueline; Hansson, Margareta E; Huybrechts, Philippe; Jugie, Gérard; Johnsen, Sigfús Jóhann; Jouzel, Jean; Kaufmann, Patrik R; Kipfstuhl, Sepp; Lambert, Fabrice; Lipenkov, Vladimir Ya; Littot, Geneviève C; Longinelli, Antonio; Lorrain, Reginald D; Maggi, Valter; Masson-Delmotte, Valerie; Miller, Heinz; Mulvaney, Robert; Oerlemans, Johannes; Oerter, Hans; Orombelli, Giuseppe; Parrenin, Frédéric; Peel, David A; Petit, Jean Robert; Raynaud, Dominique; Ritz, Catherine; Ruth, Urs; Schwander, Jakob; Siegenthaler, Urs; Souchez, Roland A; Stauffer, Bernhard; Steffensen, Jørgen Peder; Stenni, Barbara; Stocker, Thomas F; Tabacco, Ignazio; Udisti, Roberto; van de Wal, Roderik S W; van den Broeke, Michiel R; Wilhelms, Frank; Winther, Jan-Gunnar; Wolff, Eric William; Zucchelli, Mario (2004): Eight glacial cycles from an Antarctic ice core. Nature, 429(6992), 623-628, https://doi.org/10.1038/nature02599
    Details
    Publication Date: 2023-11-28
    Description: The Antarctic Vostok ice core provided compelling evidence of the nature of climate, and of climate feedbacks, over the past 420,000 years. Marine records suggest that the amplitude of climate variability was smaller before that time, but such records are often poorly resolved. Moreover, it is not possible to infer the abundance of greenhouse gases in the atmosphere from marine records. Here we report the recovery of a deep ice core from Dome C, Antarctica, that provides a climate record for the past 740,000 years. For the four most recent glacial cycles, the data agree well with the record from Vostok. The earlier period, between 740,000 and 430,000 years ago, was characterized by less pronounced warmth in interglacial periods in Antarctica, but a higher proportion of each cycle was spent in the warm mode. The transition from glacial to interglacial conditions about 430,000 years ago (Termination V) resembles the transition into the present interglacial period in terms of the magnitude of change in temperatures and greenhouse gases, but there are significant differences in the patterns of change. The interglacial stage following Termination V was exceptionally long - 28,000 years compared to, for example, the 12,000 years recorded so far in the present interglacial period. Given the similarities between this earlier warm period and today, our results may imply that without human intervention, a climate similar to the present one would extend well into the future.
    Keywords: Dome C; Dome C, Antarctica; DRILL; Drilling/drill rig; EDC; EDC99; EPICA; EPICA Dome C; European Project for Ice Coring in Antarctica; ICEDRILL; Ice drill
    Type: Dataset
    Format: application/zip, 6 datasets
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    DATA PANGAEA
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