DBPapers
DOI: 10.5593/sgem2012/s06.v2009

MAGNETISM OF ROAD DUST FROM SIX BULGARIAN CITIES AS A TOOL FOR ENVIRONMENTAL MONITORING OF URBAN POLLUTION

P. PETROV, N. JORDANOVA, D. JORDANOVA
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 601 - 608 pp

ABSTRACT

Magnetic properties of road dust collected from six Bulgarian cities were used as
proxies for monitoring urban pollution during May 2009 – November 2010. Magnetic
susceptibility shows maximum values during winter months, coherent with increased
PM10 levels. In contrast, saturation remanent magnetization exhibits maxima in
summer-autumn season and minima in winter. It is suggested that this magnetic
parameter reflects traffic-related anthropogenic pollution. Heavy metal analyses show
increased concentrations of Pb, Cu, Cr, Zn. Correlation analysis of the data set
containing magnetic parameters and heavy metals content reveals existence of very
strong negative correlation between the lead content and the ratio of anhysteretic
remanence to magnetic susceptibility. It indicates that lead is reversely linked to fine
grained magnetic fraction. The ratio of oxalate to dithionite extractible iron, which is
related to the ferrimagnetic oxides capable of carrying anhysteretic remanence, is
directly linked to Pb content as deduced by chemical extraction data.

Keywords: magnetism, road dust, monitoring, heavy metals, urban pollution