Naslov
Aqua regia extractable heavy metals in surface agricultural soils within an urban area

Autori
Romić, Marija ; Romić, Davor

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
17th World Congress of Soil Science, Soil Science: Confronting New Realities in the 21st Century, 14-21 August, Bangkok, Thailand (CD-room, full text, 1588-1-10 ; Printed version: Volume III, Symposia 29: Urban and sub-urban soils: specific risks for human health (Urban agriculture), p. 1013). / Kheoruenromne, Irb - Bangkok : Srimuang Printing Co., Bangkok, Thailand, 2002

Skup
17th World Congress of Soil Science, Soil Science: Confronting New Realities in the 21st Century, 14-21 August, Bangkok, Thailand

Mjesto i datum
Bangkok, Tajland, 14.08.2002. - 21.08.2002

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
agricultural soils; urban area; heavy metals; spatial distribution

Sažetak
Agricultural soils in urban and industrial areas are exposed to a number of different sources of contamination with harmful substances, among others also heavy metals. In the Zagreb (Croatia) metropolitan area, the best agricultural soils overlie the aquifer from which the city is supplied with most of its drinking water. Geomorphological characteristics of the studied area are very heterogeneous, the soils being mainly developed on recent fluvial deposits and Holocene alluvial sediments. The area is crossed by a very busy ring road, while a marshalling yard, the city dump and the airport are located in the vicinity. The aim of the survey was to determine the pseudo-total concentrations of Cd, Cr, Cu, Ni, Pb and Zn in surface agricultural soils within the urban area, analyze their spatial distribution, map them and relate the concentrations observed to the environment. Samples were taken from the topsoil (0-15 cm) on an area of 179 km2 according to a regular grid at 1-km intervals. Heavy metals were extracted with aqua regia from dry and sieved samples (<0.5 mm) applying the microwave technique and analyzed by flame AAS. The following average values were recorded: Cd = 0.79, Cr = 64.4, Cu = 22.3, Ni = 54.8, Pb = 30.2 and Zn = 85.2 &#61549 ; ; g g-1. A combination of classic statistical and geostatistical methods was used to assess variability in heavy metal concentrations. The closest association with anthropogenic contamination sources in the studied area was demonstrated by nickel. High concentrations, which classify the soils as highly contaminated, were recorded near the highway and the airport. In the case of lead, cadmium and zinc, the impact of polluted fluvial deposits is unquestionable, but also that of aerial deposition, as sources of heavy metals imission into soil.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

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