SESONAL AND VERTICAL VARIATION OF MINERALOGY AND PARTICLE SIZE DISTRIBUTION OF SETTLED DUST ALONG A HIGH BUILDING

Sipos, Péter and Németh, Tibor and Kovács Kis, Viktória and Szalai, Zoltán (2013) SESONAL AND VERTICAL VARIATION OF MINERALOGY AND PARTICLE SIZE DISTRIBUTION OF SETTLED DUST ALONG A HIGH BUILDING. In: IX. Kárpát-medencei Környezettudományi Konferencia, 2013.06.13-15., Miskolc.

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Abstract

Settled dust may affect air quality due to its mineralogical and particle size composition. We studied the mineralogical and particle size composition of settled dust collected seasonally at four heights and both sides of a high building next to a busy road in Budapest, Hungary. Particle size distribution of samples shows two maxima (at 12 and 37 m). The ratio of fine particles and also the maximum particle size is higher at the windward side of the building. No characteristic vertical distribution pattern was observed. However, summer samples exhibit higher ratio of coarse particles. Major mineral dust components are characteristic of surrounding geology. Clay minerals and amorphous materials enrich in the fine particle fraction (<20 m). Gypsum from constructing materials also appears there. Despite that dolomite is originated from dolomite hill behind the building its amount is higher at the front side due to special air flow conditions. In summer, carbonates and clay minerals show significant increase probably due to the re-suspension of local materials during the dry-surface periods. Vertical variation of dust mineralogy is the most conspicuous for clay minerals demonstrating the dual source of these phases as local and remote sources exert antagonistic effect on their deposition.

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