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Keywords
Abstract	Heavy metals, such us Pb and Cd are common pollutants in urban soils mainly due to traffic emissions. In order to investigate the spatial distribution of Pb and Cd in urban soils of Chania city, the soil samples were collected from the roadside of the major squares, parks and traffic islands at three depths (0-5cm, 5-15cm and 15-30cm). The total and bioavailable forms of Pb and Cd were determined by using flame Atomic Absorption Spectrometry, after their extraction with boiling Aqua Regia and DTPA respectively. Total concentration data in the three depths, according to Polish contamination standards (environmental guideline for metal pollution in soils) indicated that the studied soils can be considered medium polluted of Pb and Cd. In all sampling sites, the total contents of Pb and Cd decreased with depth suggesting undisturbed conditions and airborne deposition. The bioavailable concentrations of the studied metals were low maybe due to basic soil pH and to high content of free calcium carbonate and decreased slightly with soil depth. The relative availability of Pb was about four times higher than Cd. The highest total and bioavailable concentrations of Pb and Cd were found in the centre of the city (Agora square) mainly due to heavy traffic load. Also GIS analysis was used to visualise the spatial distribution of the total concentrations of Pb and Cd in the surface soils (0-5cm) in Chania city.
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Name	Affiliation	Home page	e-mail	Total pubs
Paida E	Laboratory of Water & Soil Resources Quality Control, Technological Educational Institute of Crete, 73133 Chania, Greece			1
Papafilippaki A	Laboratory of Soils and Agricultural Chemistry, Agricultural University of Athens, 11855, Athens, Greece.		npapafilippaki@mail.chania.teicrete.gr;	8
Sotiriou C	Laboratory of Water & Soil Resources Quality Control, Technological Educational Institute of Crete, 73133 Chania, Greece			1
Stavroulakis G	Technological Educational Institute of Crete, Department of Natural Resources and Environment, Laboratory of Water and Soil Quality Control		gstav@chania.teicrete.gr	12