2024-03-30T01:54:04Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/225352013-01-22T23:00:00Zcom_10261_15com_10261_6col_10261_268
00925njm 22002777a 4500
dc
Davidson, C.M.
author
Urquhart, G.J.
author
Ajmone-Marsan, F.
author
Biasioli, M.
author
Duarte, A. D.
author
Díaz Barrientos, Encarnación
author
Grčman, Helena
author
Hossack, L.
author
Hursthouse, A.S.
author
Madrid, Luis
author
Rodrigues, Sónia M.
author
Zurpan, M.
author
2006-02-23
The revised (four-step) BCR sequential extraction procedure has been applied to fractionate the chromium, copper, iron, manganese, nickel, lead and zinc contents in urban soil samples from public-access areas in five European cities. A preliminary inter-laboratory comparison was conducted and showed that data obtained by different laboratories participating in the study were sufficiently harmonious for comparisons to be made between cities and land types (e.g. parks, roadside, riverbanks, etc.). Analyte recoveries by sequential extraction, with respect to direct aqua regia digestion,
were generally acceptable (100±15%). Iron, nickel and, at most sites, chromium were found mainly in association with the residual phase of the soil matrix. Copper was present in the reducible, oxidisable and residual fractions, whilst zinc was found in all four sequential extracts. Manganese
was strongly associated with reducible material as, in some cities, was lead. This is of concern because high lead concentrations were present in some soils (>500 mg kg−1) and the potential exists for remobilisation under reducing conditions. As would be expected, extractable metal contents
were generally highest in older, more heavily industrialised cities. Copper, lead and zinc showed marked (and often correlated) variations in concentrations between sites within the same city whereas manganese and, especially, iron, did not. No overall relationships were, however, found
between analyte concentrations and land use, nor between analyte partitioning and land use.
Analytica Chimica Acta 565: 63–72, (2006)
0003-2670
http://hdl.handle.net/10261/22535
10.1016/j.aca.2006.02.014
http://dx.doi.org/10.13039/501100000780
Potentially toxic elements
Potentially toxic metals
Urban soil
Sequential extraction
Fractionation of potentially toxic elements in urban soils from five european cities by means of a harmonised sequential extraction procedure