- Combination of magnetic parameters: an efficient way to discriminate soil-contamination sources (south France)
- Producteur(s)
-
- Type de producteur
-
- Nature de l'étude
- 2002
- Plaines de la Crau et pourtour de l'étang de Berre
- Périmètre
- Etude à périmètre élargi
- Durée de l'étude
- 6 mois
- Thèmes
-
- Mots-clés
-
- Type d'étude
-
- Objectif
-
Biplots combining magnetic parameters allow to identification and differentiation different pollutant emission sources. A major problem in soil pollution is the characterization of the relative contributions of different anthropogenic particles sources. This paper demonstrates the efficiency of magnetic techniques to provide identification and differentiation of contaminating emission sources. About 100 soil samples were collected across a mixed agricultural and industrial area (Crau plain/Berre-Fos basin) in southern France. Nine soil profiles were realized. They are aligned along a transect, from the Mediterranean cost to the north. Measurements of initial magnetic susceptibility (w) and remanent magnetization (ARM, IRM) have been carried out at room temperature. Several ratios of magnetic parameters were calculated and tested. Bivariate analyses allow to characterize different pollution sources and graphic results suggest three dominant contributions originated from road traffic, airport and steel industry. Moreover, magnetic grain-size discrimination between surface-soil samples and bottom-soil samples is obtained. An increase of hard magnetic compo- nents from topsoil towards the bottom of the profiles is evidenced.
- Conclusion
-
The results of our investigation confirm that magnetic measurements can provide a basis for discrimination and identification of different soil-contamination sour- ces. The range of normalized parameters used here var- ies according to the magnetic mineral and grain size assemblages present. Using these parameters alone, it is difficult to make quantitative estimates of the propor- tion of different magnetic mineral phases present in samples. With a combination of magnetic parameters, it is nevertheless possible to differentiate between sample sets and to identify contaminating sources. Using bivariate analyses, size-discrimination between surface- soil samples and bottom-soil samples is obtained. An increase of hard magnetic components from topsoil towards the bottom of the profiles is exhibited.
Ce projet a été financé par l’ARS PACA et la DREAL PACA labellisées PRSE pour la partie Fos-sur-Mer et par l’OHM BMP pour la partie Bassin Minier de Provence.
Vous souhaitez apporter votre contribution à Enviro'Étang de Berre ?
Un formulaire de contact est à votre disposition afin de nous faire parvenir de nouvelles études ou vos remarques et éventuelles modifications à apporter au contenu présenté.