The geochemistry of niobium and its distribution and relative mobility in agricultural soils of Europe (CROSBI ID 248523)
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Podaci o odgovornosti
Scheib, J. ; Flight, D.M.A. ; Birke, M. ; Tarvainen, T. ; Locutura, J. ; GEMAS Project Team: ... ; Halamić, J. ; ... ; Husnjak, S. ; ... Šorša, A. ; ....
engleski
The geochemistry of niobium and its distribution and relative mobility in agricultural soils of Europe
The Geochemical Mapping of Agricultural and Grazing Land Soil (GEMAS) project provides soil geochemical data for over 50 elements at a density of 1 sample per 2500 km(2) across the European continent. Median baseline total concentrations of niobium (Nb) determined by X- ray fluorescence spectrometry in the < 2 mm fraction of 2108 ploughed agricultural soil (0- 20 cm) and 2024 grazing land (0-10 cm) samples are 13 and 12 mg/kg, respectively. These concentration levels are more than 23 times higher than the median extractable concentration of Nb obtained by aqua regia digestion. Thus > 95% of Nb in soils can be considered 'immobile'. All anomalous soil concentrations can be related to geogenic processes. Many of the elevated Nb concentrations are underlain by Hercynian granitic intrusions and alkaline volcanic rocks. High Nb levels also correspond to the occurrence of residual soils over karst areas of southeast Europe and, to some extent, loess deposits of central and Eastern Europe. Lowest Nb concentrations are found in soils developed on most recent glacial sediments of northern Europe. Comparison of the aqua regia extractable concentrations of Nb in both sample types collected within < 450 m of each other show that concentrations are on average 0.12 mg/kg (15.4%) higher in grazing land soils, suggesting an influence of different land-use practises.
GEMAS ; geochemical mapping ; XRF ; aqua regia ; extractability
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Podaci o izdanju
12 (4)
2012.
293-302
objavljeno
1467-7873
2041-4943
10.1144/geochem2011-096
Povezanost rada
Geologija, Poljoprivreda (agronomija)