 |
| Titel |
Geochemical background of zinc, cadmium and mercury in anthropically influenced soils in a semi-arid zone (SE, Spain) |
| VerfasserIn |
M. L. García-Lorenzo, C. Pérez-Sirvent, M. J. Martínez-Sánchez, J. Molina, M. L. Tudela, Manuel Hernández-Córdoba |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022320
|
|
|
|
|
|
| Zusammenfassung |
| This work seeks to establish the geochemical background for three potentially toxic trace
elements (Zn, Cd and Hg) in a pilot zone included in the DesertNet project in the province of
Murcia. The studied area, known as Campo de Cartagena, Murcia (SE Spain) is an area of
intensive agriculture and has been much affected over the years by anthropic activity. The
zone can be considered an experimental pilot zone for establishing background levels in
agricultural soils.
Sixty four samples were collected and corresponded to areas subjected to high and similar
agricultural activity or soils with natural vegetation, which correspond to abandoned
agricultural areas. The Zn content was determined by flame atomic absorption spectrometry.
The Cd content was determined by electrothermal atomization atomic absorption
spectrometry and mercury content was determined by atomic fluorescence spectrometry.
Geostatistical analysis consisting of kriging and mapping was performed using the
geostatistical analyst extension of ArcGIS 8.3.
Zinc values ranged from 10 mg kg-1 to 151 mg kg-1, with an average value of 45 mg
kg-1. Cadmium values ranged between 0.1 mg kg-1 and 0.9mg kg-1, with a mean value of
0.3 mg kg-1 and mercury values ranged from 0.1 mg kg-1 to 2.3 mg kg-1, with a mean
value of 0.5 mg kg-1.
At a national level, the Spanish Royal Decree 9/2005 proposes toxicological and
statistical approaches to establish background values. According to the statistical approach,
background values consist of the median value for the selected element. The background
values for Zn, Cd and Hg in the studied area were 40 mg kg-1 for Zn, 0.3 mg kg-1 for Cd and
0.4 mg kg-1 for Hg. |
|
|
|
|
|
|