Characterization of the accumulation of metals and organic contaminants on a novel active-passive sampling device under controlled water flow conditions
Autor: | Raewyn M. Town, Freddy Dardenne, Maarten Weyn, Lieven Bervoets, Jonas Hereijgers, Adrian Covaci, Tom Breugelmans, Dung T. Nguyen, Elvio D. Amato, Ronny Blust, Dragan Subotic |
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Rok vydání: | 2019 |
Předmět: |
Environmental Engineering
Materials science Sorbent Water flow Health Toxicology and Mutagenesis 0208 environmental biotechnology Analytical chemistry 02 engineering and technology 010501 environmental sciences 01 natural sciences Flow measurement Diffusion Diffusion layer Metal Environmental Chemistry Organic Chemicals Biology 0105 earth and related environmental sciences Public Health Environmental and Occupational Health Equipment Design General Medicine General Chemistry Contamination Pollution 020801 environmental engineering Volumetric flow rate Chemistry Flow conditions Metals visual_art Hydrodynamics visual_art.visual_art_medium Engineering sciences. Technology Water Pollutants Chemical Environmental Monitoring |
Zdroj: | Chemosphere |
ISSN: | 0045-6535 |
DOI: | 10.1016/j.chemosphere.2019.124400 |
Popis: | Recently, a new sampling device combining active and passive sampling (APS) was developed for the measurement of time-averaged concentrations of metal species and both polar and non-polar organic contaminants in water. By coupling a diffusion cell (loaded with a set of sorbents selective for different substances) with a small pump and a flow meter, the APS device is able to perform in situ measurements that are independent of the hydrodynamic conditions in the exposure medium. In the present study, the diffusion layer thickness (δ) at the sorbent/solution interface within the diffusion cell was characterised under controlled flow conditions. Laboratory tests indicated that, in the range of flow rates investigated, the average diffusion layer thickness ( δ ¯ ) varied from ∼60 to ∼110 μm, depending on the type of substance measured and the position of the sorbent with respect to the flow direction. Due to its ability to maintain an approximately constant δ ¯ , good to excellent agreement was found between measurements performed with the APS device in non-complexing media and concentrations measured in discrete water samples for all the substances investigated. These results suggest that the APS device could overcome issues affecting the quantitative interpretation of measurements by conventional passive sampling devices and serve as a useful tool for simultaneously monitoring a wide range of contaminants in water. |
Databáze: | OpenAIRE |
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