STRONTIUM ISOTOPE COMPOSITION OF SOLID PARTICULATE MATTER IN THE ST. PETERSBURG ATMOSHERE

S.B. Felitsyn, E.S. Bogomolov

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St.-Petersburg, 199034 Russia. E-mail: felitsyn@peterlink.ru

Strontium isotope composition of solid particulate matter (particle size less than 5 µm, PM5 fraction) display 87Sr/86Sr ratio ranging within 0.7157–0.7295. Such values are closely related to the mineral composition of urban dust, i.e., low 87Sr/86Sr and enhanced Sr concentration typically for urban dust in St. Petersburg with predominance of particles emitted from local sources. The enhanced K-feldspars content in urban dust from St. Petersburg results in 87Sr/86Sr higher than 0.720 and could point to regional source of airborne particles.  Large proportion of 90Sr in fine fractions of St. Petersburg urban dust is linked to solid airborne minerals exfoliated during the weathering of granitoids.

Key words: urban dust (PM5 fraction), 87Sr/86Sr ratio, mineral composition of solid particulate matter.

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