¿Qué pasa con los contaminantes emergentes que llegan al suelo cuando se riega con aguas regeneradas?: Metodología multi-residuo y efectos de la esterilización de las muestras del suelo

Abstract

A multi-residue methodology was established to understand what happens to emerging compounds (EC) in irrigated soils reusing re generated water. To improve the knowledge of the bioavailability of EC to be absorbed by plant roots, a water:methanol extractant was used after enriching diff erent soil samples with a mixture of 23 EC. To discriminate biodegradation from adsorption, tyndaliza tion-sterilized and nontindalization-sterilized soil samples were fortifi ed with 2.5; 5; 10 and 50 μg/L and 10 and 50, respectively, (equivalent to 17.5 and 350 μg/kg of soil). A multi-residue method capable of determining emerging contaminants that may occur in soil has been validated. Following EC present signifi cant diff er ences due to tyndalization: Ac, At, Cb, Cy, Kt, Sl, Tr and Vl, their eff ect not being signifi cant for the rest of EC. The low recoveries have demonstrated the diffi culty of extracting compounds from the soil, which explains the low absorptions presented by crops irrigated with regenerated water. Thus, the barrier represented by the soil and the rhizosphere seems to guarantee the safety of re use, so it is necessary to delve into these stud