Calcul des doses d'irrigation pour les sols salés : application d'une méthode géochimique de calcul à un sol tunisien

La méthode de prévision du volume de lessivage recommandée par la FAO (méthode classique) néglige la précipitation des minéraux à partir de la solution du sol. La méthode dite géochimique prend en compte ces phénomènes par le biais d'un modèle thermodynamique. L'application de ces deux méthodes à la station de Cherfech en Tunisie permet de comparer leur validit

Verification de la coincidence geometrique des points de mesure neutronique et gammametrique pour SOLO 40 et CPN 501 B

National audienc

Calcul des doses d'irrigation pour les sols salés : application d'une méthode géochimique de calcul à un sol tunisien

La méthode de prévision du volume de lessivage recommandée par la FAO (méthode classique) néglige la précipitation des minéraux à partir de la solution du sol. La méthode dite géochimique prend en compte ces phénomènes par le biais d'un modèle thermodynamique. L'application de ces deux méthodes à la station de Cherfech en Tunisie permet de comparer leur validit

Etude de la relation debit/concentration en elements dissous dans des eaux drainees de boulbene

National audienc

New direct contact approach to evaluate soil genotoxicity using the Vicia faba micronucleus test.

International audienc

Impact of anaerobic digestion on organic matter quality in pig slurry

International audienc

Multi-metal contamination of a calcic cambisol by fallout from a lead-recycling plant

International audienc

Multi-metal contamination of a calcic cambisol by fallout from a lead-recycling plant

International audienceThe present study deals with the impact of a lead-recycling plant on metal accumulation in soils, evaluated by a global pedological analysis. This general approach can be used on various contaminated sites to evaluate impact of an anthropogenic activity and inform on metal origin and behavior. A soil profile collected in the vicinity of a lead-recycling plant in operation for 40 years was studied. Correlations between major and trace elements highlighted different patterns of metals according to their origins. Two groups of metals were identified: (i) Pb, Sb, Sn, As, Cu and Zn of anthropogenic origin and (ii) Ni and Cr of natural origin. The results showed that Pb, Sb and Sn presented the highest relative contamination followed by Cu, As and Zn. Moreover, Pb and Sb migrated most along the profile at an estimated rate of 1.5 cm y−1, followed by Sn, then Zn, Cu and finally As. Sequential extractions showed that all metals were mainly solubilized by reduction and therefore estimated to be bound to iron oxides, except lead which was rather in the acid-soluble fraction in the contaminated horizons. Furthermore, high levels of lead were found in water-soluble and exchangeable fractions (4.2 mg kg−1) suggesting the occurrence of lead transfer towards the trophic chain

Bioavailability of Cu and Zn in raw and anaerobically digested pig slurry

International audienceThe impact of anaerobic digestion on the bioavailability of copper and zinc from pig slurry was assessed. Both chemical and biological approaches were used independently on raw slurry (RS) and anaerobically digested pig slurry (DS). This work, using ultracentrifugation pellets from the same pig slurry before and after an anaerobic treatment, confirmed that Cu and Zn behave differently in terms of bioavailability, and contrasting results were obtained by chemical and biological assessments. A chemical approach combined a preliminary study of the pH effect on particulate/dissolved metal partitioning, sequential extraction, and biochemical fractionation. This approach tended to show a lower mobility of metals from digested slurry (DS). A biological approach was carried out with Zea mays and Vicia faba to study Cu and Zn uptake in soil amended with RS or DS. This assay could not differentiate the two slurries