Assessment of the Usefulness of Semipermeable Membrane Devices for Long-Term Watershed Monitoring in an Urban Slough System |
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Authors: | Kathleen McCarthy |
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Institution: | (1) U.S. Geological Survey, 10615 SE Cherry Blossom Drive, Portland, OR 97216, USA |
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Abstract: | Semipermeable membrane devices (SPMDs) were deployed at eight sites within the Buffalo Slough, near Portland, Oregon, to (1)
measure the spatial and seasonal distribution of dissolved polycyclic aromatic hydrocarbon (PAH) and organochlorine (OC) compounds
in the slough, (2) assess the usefulness of SPMDs as a tool for investigating and monitoring hydrophobic compounds throughout
the Columbia Slough system, and (3) evaluate the utility of SPMDs as a tool for measuring the long-term effects of watershed
improvement activities. Data from the SPMDs revealed clear spatial and seasonal differences in water quality within the slough
and indicate that for hydrophobic compounds, this time-integrated passive-sampling technique is a useful tool for long-term
watershed monitoring. In addition, the data suggest that a spiking rate of 2–5 μg/SPMD of permeability/performance reference compounds, including at least one compound that is not susceptible to photodegradation,
may be optimum for the conditions encountered here. |
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Keywords: | exposure-adjustment factors hydrophobics long-term monitoring passive sampling permeability/performance reference compounds semipermeable membrane devices |
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