Chemical Characteristics of Dust Particles in the Heavy Gust Broken Out at Gansu, China on 5th May 1993.

概要

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A big gust, which was suddenly broken out in Gansu desert area on 5th May 1993, gave the heavy disaster in many places. This gust was transported by the strong wind to Xian after 1 day, and its particles were collected with a plastic thin sheet in the suburbs of Xian. The gust particles and the loess particles in Xian were analyzed after acid digestion for bulk concentration of many elements, and were also analyzed by X-ray photoelectron spectrometry for the chemical state of sulfur at the particle surface and for the surface composition of major elements in particles. The lower concentration ratios of alkaline elements, especially calcium, to aluminium in the gust particles compared with those in the Xian loess were thought to be due to weathering. Sulfur has been found to be present as sulfate form rather than the sulfide in the gust particles as well as Xian loess particles and Kosa aerosols. Sulfur to calcium ratios are higher at the sur-face than in the bulk of gust particles, indicating that sulfur tends to be rich at the surface of the particles.
日本環境化学会の論文