Publication details

Sampling rate: relation with hydrophobicity in passive sampling



Year of publication 2008
Type Article in Proceedings
Conference Abstract book
MU Faculty or unit

Faculty of Science

Field Water pollution and control
Keywords pasive sampling; silicon rubber
Description Application of passive samplers for monitoring of hydrophobic organic contaminants (HOCs) requires calibration data that relate absorbed amounts in the sampler to dissolved aqueous concentrations (CW). When equilibrium between a sampler and water phase is attained, CW can be calculated using sampler-water partition coefficients. For very hydrophobic compounds that are in linear uptake phase sampling rates (RS) are needed. To examine the relation of RS with KOW passive samplers should be calibrated for the target compounds under controlled conditions in the laboratory prior to deployment in the environment. Accurate determination of very low CW of HOCs in water suffers from surface sorption effects of HOCs, sorption to particulate matter and dissolved organic carbon material, with a consequence of overestimation of the CW in high KOW range. We investigated the RS-KOW relation using an excess number of spiked samplers with known contaminant concentration for dosing the water. Freely dissolved water concentrations are known through the water-sampler partition coefficients. By deployment of non-spiked samplers RS values were determined.
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