TitleIn situ passive sampling of sediments in the Lower Duwamish Waterway Superfund site: Replicability, comparison with ex situ measurements, and use of data.
Publication TypeJournal Article
AuthorsApell JN, Gschwend PM
JournalEnviron Pollut
Date2016 Nov
KeywordsBiodegradation, Environmental, Environmental Exposure, Environmental Monitoring, Food Chain, Geologic Sediments, Humans, Massachusetts, Polychlorinated Biphenyls, Porosity, Reference Standards, Refuse Disposal, Reproducibility of Results, Water Pollutants, Chemical

Superfund sites with sediments contaminated by hydrophobic organic compounds (HOCs) can be difficult to characterize because of the complex nature of sorption to sediments. Porewater concentrations, which are often used to model transport of HOCs from the sediment bed into overlying water, benthic organisms, and the larger food web, are traditionally estimated using sediment concentrations and sorption coefficients estimated using equilibrium partitioning (EqP) theory. However, researchers have begun using polymeric samplers to determine porewater concentrations since this method does not require knowledge of the sediment's sorption properties. In this work, polyethylene passive samplers were deployed into sediments in the field (in situ passive sampling) and mixed with sediments in the laboratory (ex situ active sampling) that were contaminated with polychlorinated biphenyls (PCBs). The results show that porewater concentrations based on in situ and ex situ sampling generally agreed within a factor of two, but in situ concentrations were consistently lower than ex situ porewater concentrations. Imprecision arising from in situ passive sampling procedures does not explain this bias suggesting that field processes like bioirrigation may cause the differences observed between in situ and ex situ polymeric samplers.

Alternate JournalEnviron. Pollut.
PubMed ID27552042
Research Lab
Gschwend Lab
Groups audience

More Information

  1. Gschwend Lab

    Banner Image
    Group user permission inheritance
    Inherit Permissions - inherited users in this group's subgroups will have the permissions as they do in this group and not the permissions of generic members of that subgroup.
    Parsons Laboratory
    Banner Position
    Above toolbar (stretched)
    Banner Text
    Gschwend Lab
    Contact Information
    <p>Professor Philip Gschwend<br>Ralph M. Parsons Laboratory for Environmental Science and Engineering<br>Massachusetts Institute of Technology<br>15 Vassar Street<br>Cambridge, MA 02139</p>
    Group user inheritance
    No - subgroups of this group won't inherit its users.
    Group visibility
    Public - accessible to all site users
    Group roles and permissions
    Use default roles and permissions
    Override default space options
    Space Blueprint