Organic amendment influence in the uptake of weathered DDTs and endosulfans residues in soil by willow trees (Salix sp.).

MITTON, FRANCESCA MARIA; GONZALEZ, MARIANA; MIGLIORANZA, KARINA SILVIA BEATRIZ

Sevilla, España

Congreso; 20th SETAC Europe Annual Meeting; 2010

SETAC Europa

Soil phytoremediation is a promising in situ technology involving the plant-assisted removal of contaminants. The high hydrophobicity of DDTs and Endosulfans leads to lower availability and became a limiting factor in the phytoremediaton process. However, there are evidences that low-molecular-weight organic acids and surfactants increase pesticides desorption from soil and plant accumulation. Greenhouse experiments were conducted to evaluate the effect of Tween80 (Tw), root exudate and oxalate-citrate mixture (CA) in the uptake of DDTs and END (Endosulfan I, II and sulphate) by Salix sp. Plants were grown in soil contaminated with DDTs (≈500 ng/g) and END (≈3ng/g), treatments and control (water) were performed in individual pots covered to avoid volatilisation (n=3). Pesticides quantification in bulk soil (BS), near root (NR), rhizosphere (RI), root and leaves were carried out by GC-ECD. Control pots showed the pattern RI>BS>NR for all pesticides. A different pattern was found on treatments, being BSsulphate). Willow uptake of pesticides was affected by the studied amendments. Differences for pesticides in Tw and CA treatments could be related with specific amendment-pesticide interaction. It will be further investigated since could play a significant role in the phytoremediation of these pesticides.