『Abstract
Discriminating between different sources of natural and anthropogenic
pollution is a topic of scientific interest, but also important
for sociopolitical and economic reasons. To contribute to potential
application of magnetic measurements for evaluating industrial
pollution in urban environment from multi-anthropogenic sources,
characteristics of street dust from a typical fast developing
industrial city (Loudi, Hunan province, China) were studied by
magnetic and non-magnetic (microscopic, chemical and statistical)
methods. Anthropogenic magnetic spherules and iron from a Fe-smelting
plant and traffic-related angular-shaped particles were identified.
Heavy metals originates from different anthropogenic activities;
Fe, Co, and Mo from the Fe-smelting plant; Cu and Ni from vehicle
traffic; Pb, Zn and Cd from both above anthropogenic sources;
Cr, Ni and Be from other anthropogenic activities. The degree
of heavy metal pollution in street dust is controlled by locations
of anthropogenic activities and main wind directions. Although
correlation of the Tomlinson pollution load index of anthropogenic
heavy metals with mass-specific magnetic susceptibility (χ) values
is only moderate, our study demonstrates that magnetic proxies
provide a rapid means for detecting and outlining regions with
possible higher heavy metal contamination caused by multi-anthropogenic
pollution sources in urban cities.
Keywords: Environmental magnetism; Heavy metals; Street dust;
Multi anthropogenic activities; Hunan China』
1. Introduction
2. Sampling and laboratory measurements
3. Results
3.1. Magnetic concentration parameters and heavy metal contents
3.2. Magnetic properties
3.3. SEM and EDX
3.4. Statistic results of heavy metals and magnetic parameters
4. Discussion
4.1. Source of magnetic particles and heavy metals in street
dust
4.2. Environmental implications of magnetic parameters in street
dust
5. Conclusions
Acknowledgements
References