Abstract
The ice core dust particulate sampled from Mt. **xabangma has been analyzed by means of X-ray photoelectron spectrometer (XPS) and scanning electron microscope with energy dispersion X-ray analysis (SEM/EDAX). The results show that the contents of SO 2−4 and SO 2−4 in the surface layer of the dust are significantly higher than those in the subsurface layer (with the exception of organic sulfide). This difference indicates that the surface SOx has been captured and then chemically converted by the atmospheric dust particulate before its deposition with snow, which is obviously different from those inner layer sulfates and sulfites contained by dust itself. In addition, it has been determined by SEM/EDAX that the dust contains relatively high concentrations of transition metal elements such as Fe and Ti oxides which could function as photocatalysts to the conversion of SOx adhered on the surface of the dust, and consequently accelerate the deposition of SOx to snow. Our research also demonstrates that the adsorptive carrying and the catalytic performance of the dust to the atmospheric SOx are most important causes of the positive correlation between SO 2−4 and dust concentration records in ice cores.
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References
Li Zhongqin, Yao Tandong, **e Zichuet al., Modern atmospheric environmental records in Guliya Ice Cap of Qinghai-**zang Plateau,Chinese Sciences Bulletin. 1995, 40: 874.
Rospero, J. M., Savoie, D. L., Effect of continental sources on nitrate concentrations over the Pacific Ocean,Nature, 1989, 339(6227): 687.
Michael, R. H., Scot, T. M., Wonyong Choiet al., Environmental application of semiconductor photocatalysis,Chem. Rev., 1995, 95(1): 69.
Martin, L. R., Good, T. W., Catalysed oxidation of sulfur dioxide in solution: the iron-manganese synergism,Atmas. Environ., 1991, 25A: 2395.
Grigic, I., Hudnik, V., Bizjak, M.et al., Aqueous S (IV) oxidation I. Catalytic effect of some metal ions,Atmos. Environ., 1991, 25A: 1591.
Faust, B.C., Hoffmann, M. R., Bahnemann, D. W., Photocatalytic oxidation of sulfur dioxide in aqueous suspensions of α-Fe2O3,J. Phys. Chem., 1989. 93: 6371.
Yasumichi Matsumoto, Hideakl Nagal, Ei-ichi Stato, Photocatalytic oxidation of sulfur on titanium dioxide,J. Phys. Chem., 1982, 86: 4664.
Christian, B., Rudi van Eidik,: Transition metal-catalysed oxidation of sulfur (IV) oxides: Atmospheric-relevant processes and mechanisms,Chem. Rev., 1995: 119.
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Li, Z., Lu, G., Liu, B. et al. Ice core dust particulate by XPS-SEM/EDAX. Chin.Sci.Bull. 44, 1424–1427 (1999). https://doi.org/10.1007/BF02885997
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DOI: https://doi.org/10.1007/BF02885997