Modeling the response of passive samplers to varying ambient fluid concentrations of organic contaminants

Hawker, Darryl William

doi:10.1002/etc.69

Cited by 23 publications

(15 citation statements)

References 23 publications

(35 reference statements)

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“…Thus, understanding sampler reaction to varying solute concentrations in water is vital if an accurate interpretation of masses accumulated in the samplers is to be achieved. While modeling of sampler reaction to varying concentrations has been undertaken for nonpolar substances 53–55 and for medium polar herbicides using SDB‐RPS Empore disks 56, limited data are available for POCIS 57. Calibration experiments simulating variable water concentrations should therefore be undertaken to develop and validate models that can describe how accurately POCIS integrates peaks in analyte concentrations.…”

Section: Calibration Methods Used For Pocismentioning

confidence: 99%

Calibration and use of the polar organic chemical integrative sampler—a critical review

Harman

Allan

Vermeirssen

2012

Enviro Toxic and Chemistry

262

249

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Abstract-The implementation of strict environmental quality standards for polar organic priority pollutants poses a challenge for monitoring programs. The polar organic chemical integrative sampler (POCIS) may help to address the challenge of measuring low and fluctuating trace concentrations of such organic contaminants, offering significant advantages over traditional sampling. In the present review, the authors evaluate POCIS calibration methods and factors affecting sampling rates together with reported environmental applications. Over 300 compounds have been shown to accumulate in POCIS, including pesticides, pharmaceuticals, hormones, and industrial chemicals. Polar organic chemical integrative sampler extracts have been used for both chemical and biological analyses. Several different calibration methods have been described, which makes it difficult to directly compare sampling rates. In addition, despite the fact that some attempts to correlate sampling rates with the properties of target compounds such as log K OW have been met with varying success, an overall model that can predict uptake is lacking. Furthermore, temperature, water flow rates, salinity, pH, and fouling have all been shown to affect uptake; however, there is currently no robust method available for adjusting for these differences. Overall, POCIS has been applied to a wide range of sampling environments and scenarios and has been proven to be a useful screening tool. However, based on the existing literature, a more mechanistic approach is required to increase understanding and thus improve the quantitative nature of the measurements. Environ. Toxicol. Chem. 2012;31:272431: -273831: . # 2012

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Section: Calibration Methods Used For Pocismentioning

confidence: 99%

Calibration and use of the polar organic chemical integrative sampler—a critical review

Harman

Allan

Vermeirssen

2012

Enviro Toxic and Chemistry

262

249

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“…However in practice, curvilinear accumulation might occur because, for instance, passive Twisters might be exposed for periods longer than the linear accumulation period. The integration of a concentration peak or the exposure of the sampler to decreasing water concentrations could also lower the t 1/2 value, and shorten the linear accumulation period (Hawker 2010;Booij and Tucca 2015). Therefore, the ability of the passive Twisters in curvilinear sampling for providing accurate enough concentrations needs to be assessed for future field applications of the passive SBSE.…”

Section: Evaluation Of Twac Accuracy (Experiments N°3) Water Concentrmentioning

confidence: 99%

How do PDMS-coated stir bars used as passive samplers integrate concentration peaks of pesticides in freshwater?

Assoumani

Margoum

Lombard

et al. 2016

Environ Sci Pollut Res

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Passive samplers are theoretically capable of integrating variations of concentrations of micropollutants in freshwater and providing accurate average values. However, this property is rarely verified and quantified experimentally. In this study, we investigated, in controlled conditions, how the polydimethylsiloxane-coated stir bars (passive Twisters) can integrate fluctuating concentrations of 20 moderately hydrophilic to hydrophobic pesticides (2.18 < Log K < 5.51). In the first two experiments, we studied the pesticide accumulation in the passive Twisters during high concentration peaks of various durations in tap water. We then followed their elimination from the passive Twisters placed in non-contaminated water (experiment no. 1) or in water spiked at low concentrations (experiment no. 2) for 1 week. In the third experiment, we assessed the accuracy of the time-weighted average concentrations (TWAC) obtained from the passive Twisters exposed for 4 days to several concentration variation scenarios. We observed little to no elimination of hydrophobic pesticides from the passive Twisters placed in non-contaminated water and additional accumulation when placed in water spiked at low concentrations. Moreover, passive Twisters allowed determining accurate TWAC (accuracy, determined by TWAC-average measured concentrations ratios, ranged from 82 to 127 %) for the pesticides with Log K higher than 4.2. In contrast, fast and large elimination was observed for the pesticides with Log K lower than 4.2 and poorer TWAC accuracy (ranging from 32 to 123 %) was obtained.

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“…The primary benefit of using PSDs is their ability to provide time-integrated information about fluctuating water concentrations (Gale 1998;Gourlay-France et al 2008;Hawker 2010). This is of special relevance here as concentrations may vary with the level of depositional activity.…”

Section: Introductionmentioning

confidence: 99%

Release of dissolved trace metals and organic contaminants during deep water disposal of contaminated sediments from Oslo harbour, Norway

2011

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Purpose The current study was conducted in order to assess the release of dissolved contaminants from sediment relocation works in Oslo harbour, Norway, whilst operations were being carried out, and to assess the potential for spreading into the wider fjord area. Materials and methods This was achieved by comparing the concentration of metals and organic contaminants in the vicinity of the disposal site, and at strategic locations in the adjacent fjord area. In total, 14 stations were chosen, with passive sampling devices, diffusive gradients in thin films for metals and semipermeable membrane devices for organic compounds, deployed at various depths at each station for a period of 1 month. Results and discussion The highest concentrations were generally found closer to the harbour area where trace metals and organic contaminants are supplied from several sources including river discharges and old, contaminated sediments. Near the deposition site, the concentrations of polychlorinated biphenyls were low and the concentration gradients for Cd, Zn and Cu indicated removal of these metals from the water column, probably due to association with sulphides present at the deposition site or in the discharged sediments. Elevated concentrations of Pb and polycyclic aromatic hydrocarbons (PAHs) revealed that the disposal acted as a source of these compounds, but maximum concentrations were similar to or less than those predicted before the deposition begun. The estimated vertical transport and spreading to areas outside of the semi-enclosed sill basin was negligible. Conclusions Strictly, the validity of the results presented here are limited to a 1-month period of the disposal operations which lasted nearly 3 years. During this period, release of contaminants was compound-specific, but even for the most labile PAHs and Pb, the release appeared to be in the same order of magnitude or smaller than the release from other local sources not limited in time to the duration of the remediation operation.

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Modeling the response of passive samplers to varying ambient fluid concentrations of organic contaminants

Cited by 23 publications

References 23 publications

Calibration and use of the polar organic chemical integrative sampler—a critical review

Calibration and use of the polar organic chemical integrative sampler—a critical review

How do PDMS-coated stir bars used as passive samplers integrate concentration peaks of pesticides in freshwater?

Release of dissolved trace metals and organic contaminants during deep water disposal of contaminated sediments from Oslo harbour, Norway

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