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Calibration of silicone rubber rods as passive samplers for pesticides at two different flow velocities: Modeling of sampling rates under water boundary layer and polymer control

Abstract : There is a need to determine time-weighted average concentrations of polar contaminants such as pesticides by passive sampling in environmental waters. Calibration data for silicone rubber (SR)-based passive samplers are lacking for this class of compounds. The calibration data, sampling rate (Rs) and partition coefficient between SR and water (Ksw) were precisely determined for 23 pesticides and 13 candidate performance reference compounds (PRCs) in a laboratory calibration system over 14 d for two water flow velocities, 5 cm s-1 and 20 cm s-1. Results showed that an in situ exposure duration of 7 d left a SR rod passive sampler configuration in the linear or curvilinear uptake period for 19 of the pesticides studied. A change in the transport mechanism from polymer control to water boundary layer control was observed for pesticides with a log Ksw of around 3.3. The PRC candidates were not fully relevant to correct the impact of water flow velocity on Rs. We therefore propose an alternative method based on an overall resistance to mass transfer model to adjust Rs from laboratory experiments to in situ hydrodynamic conditions. We estimated diffusion coefficients (Ds) and thickness of water boundary layer (δw) as adjustable model parameters. Log Ds values ranged from
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Submitted on : Saturday, May 16, 2020 - 1:34:02 PM
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Alexis Martin, Christelle Margoum, Antoine Jolivet, Azziz Assoumani, Bachir El Moujahid, et al.. Calibration of silicone rubber rods as passive samplers for pesticides at two different flow velocities: Modeling of sampling rates under water boundary layer and polymer control. Environmental Toxicology and Chemistry, Wiley, 2018, 37 (4), pp.1208-1218. ⟨10.1002/etc.4050⟩. ⟨hal-01803608⟩

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