In-Situ calibration of POCIS for the sampling of polar pesticides and metabolites in surface water

Imtiaz Ibrahim (1, 2) , Anne Togola (1) , Catherine Gonzalez (2)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 LGEI - Laboratoire de Génie de l'Environnement Industriel

Over the past years, passive sampling devices have been successfully used for the monitoring of various pollutants in water. The present work studied the uptake kinetics in surface water of ten polar pesticides and metabolites, using pharmaceutical POCIS samplers. The aim was to determine sampling rates from in-situ calibration and to compare results with those obtained earlier under laboratory conditions, with the final objective of assessing the impact of environmental conditions on POCIS field performance. Field results showed a low efficiency of POCIS uptake capacity for moderately polar compounds, such as propiconazole (logKow=3.72) and tebuconazole (logKow=3.7), that were present in the aqueous phase at very low levels. The in-situ sampling rates obtained in this study ranged from 169 to 479 mL g-1 day-1 and differ by a factor of 3 to 7.5 from Rs determined under laboratory conditions.

Mots clés: in-situ calibration; Passive sampling; POCIS; Polar pesticides; metabolites

Domaines: Ingénierie de l'environnement; Chimie analytique

Imtiaz Ibrahim, Anne Togola, Catherine Gonzalez. In-Situ calibration of POCIS for the sampling of polar pesticides and metabolites in surface water. Talanta, 2013, 116, pp.495-500. ⟨10.1016/j.talanta.2013.07.028⟩. ⟨hal-00851490⟩