Naslov
Regional Atmospheric Lead Pollution of the Croatian Karst Environments: Evidence from Geochemical Mapping and Stable Lead Isotopes

Autori
Miko, Slobodan ; Šparica, Martina ; Mesić, Saša ; Peh, Zoran ; Prohić, Esad

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
1st International Symposium on Environmental management ; Book of Abstracts / Koprivanac, Natalija - Zagreb : Fakultet kemijskog inženjerstva i tehnologije Sveučilišta u Zagrebu, 2003, 72-72

Skup
1st International Symposium on Environmental management

Mjesto i datum
Zagreb, Hrvatska, 01.10.2003. - 03.10.2003

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
lead; isotopes; geochemical mapping; atmospheric pollution; soil; karst; Vrana Lake; Croatia

Sažetak
High lead concentrations in soils of Croatian karst occur on the sharp geomorphological boundary where the Mediterranean climate abruptly changes into a cold continental climate. These were determined by geochemical baseline mapping of the topsoil cover in the Croatian karst regions of Istria, Gorski kotar, Kvarner and Lika which was performed through the analysis of over 800 sampling sites. The sediment records of the karstic lake Vrana on the iland of Cres were used to estimate long-term changes in anthropogenic metal emissions. A total of 25 major and trace elements including (Mo, Cd, Pb, Zn, As, Ni, Cu, Co) was analyzed by ICP-AES and Hg by FAAS. Lead isotope ratios were determined on selected soil and sediment profiles by ICP-MS. The patterns of geochemical distributions of Pb, Hg, Cd, and total S in topsoil indicate anomalous concentrations in the Gorski kotar and Velebit Mountain regions. The anomalies (especially Pb) overlap with the contours of mean annual precipitation of more than 2500 mm, indicating an association of these elements with airborne contamination. Detailed studies of the Pb distribution in the profiles showed concentrations of lead in remote regions up to 200 mgkg-1 in the upper 4 cm of the soil profiles. Water extractable Pb concentrations from up to 727 mgL-1 in the top horizons usually decrease to less than 5 mgL-1 at depths below 25 cm. The isotopic ratio 206Pb/207Pb in all topsoil samples from both remote sites and those close to major roads has a narrow range from 1.18 to 1.185. Samples taken at depths of 1m show a much wider range from 1.21 to 1.32. Road side and sinkhole soils have 206Pb/207Pb ratios from 1.125 to 1.14 as a direct influence of petrol-lead. The Vrana lake sediments in an 80 cm long core show a 206Pb/207Pb ratio decline from 1.24 to 1.17 in the upward direction, reflecting the low ratio in modern aerosols.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA