<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Christine C Ghetu</style></author><author><style face="normal" font="default" size="100%">Ian L Moran</style></author><author><style face="normal" font="default" size="100%">Richard P Scott</style></author><author><style face="normal" font="default" size="100%">Lane G Tidwell</style></author><author><style face="normal" font="default" size="100%">Peter D Hoffman</style></author><author><style face="normal" font="default" size="100%">Kim A Anderson</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Concurrent assessment of diffusive and advective PAH movement strongly affected by temporal and spatial changes.</style></title><secondary-title><style face="normal" font="default" size="100%">Sci Total Environ</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Sci Total Environ</style></alt-title></titles><dates><year><style  face="normal" font="default" size="100%">2023</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2023 Nov 20</style></date></pub-dates></dates><pages><style face="normal" font="default" size="100%">168765</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Chemical movement influences exposure, remediation and interventions. Understanding chemical movement in addition to chemical concentrations at contaminated sites is critical to informed decision making. Using seepage meters and passive sampling devices we assessed both diffusive and advective flux of bioavailable polycyclic aromatic hydrocarbons (PAHs) at three time points, across two seasons, at a former creosote site in St. Helens, Oregon, United States. To our knowledge, this is the first time both diffusive and advective fluxes have been measured simultaneously at a contaminated site. Concentrations of 39 parent PAHs were determined by gas chromatography triple quadrupole mass spectrometry. Across both seasons and all sites, diffusive flux of PAHs was up to three orders of magnitude larger than advective flux. Release of PAHs from sediments and water were identified, likely from legacy contamination, as well as deposition from the air into the site from contemporary and other sources. The majority of PAH movement was comprised of three and four ring PAHs. Chemical movement on the site was found to be spatially and temporally variable. Volatilization decreased and atmospheric deposition increased from summer to fall. At the locations with higher levels of contamination, sum PAH release from sediments decreased by more than two orders of magnitude from summer to late fall. These data reflect the spatial heterogeneity and temporal variability of this site and demonstrate the importance of seasonality in assessing chemical movement at contaminated sites. Results from this study can inform future legacy site assessments to optimize remediation strategies and assess remediation effectiveness.&lt;/p&gt;
</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>13</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Briana N Rivera</style></author><author><style face="normal" font="default" size="100%">Christine C Ghetu</style></author><author><style face="normal" font="default" size="100%">Kim A Anderson</style></author><author><style face="normal" font="default" size="100%">Susan C Tilton</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A Comparative Approach to Evaluating Bioactivity of Representative Mixtures</style></title><secondary-title><style face="normal" font="default" size="100%">Protecting Our Water Future for Human and Environmental Health</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">01/2020</style></date></pub-dates></dates><language><style face="normal" font="default" size="100%">eng</style></language></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>13</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Briana N Rivera</style></author><author><style face="normal" font="default" size="100%">Christine C Ghetu</style></author><author><style face="normal" font="default" size="100%">Kim A Anderson</style></author><author><style face="normal" font="default" size="100%">Susan C Tilton</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A Comparative Approach to Evaluating Bioactivity of Representative Mixtures</style></title><secondary-title><style face="normal" font="default" size="100%">Protecting Our Water Future for Human and Environmental Health</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">01/2020</style></date></pub-dates></dates><language><style face="normal" font="default" size="100%">eng</style></language></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>13</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Briana N Rivera</style></author><author><style face="normal" font="default" size="100%">Christine C Ghetu</style></author><author><style face="normal" font="default" size="100%">Diana Rohlman</style></author><author><style face="normal" font="default" size="100%">Kaley A Adams</style></author><author><style face="normal" font="default" size="100%">Kim A Anderson</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A Comprehensive Comparison of Indoor vs Outdoor Air Quality Across the United States</style></title><secondary-title><style face="normal" font="default" size="100%">Society of Environmental Toxicology and Chemistry</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">11/2020</style></date></pub-dates></dates><language><style face="normal" font="default" size="100%">eng</style></language></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>3</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Briana N Rivera</style></author><author><style face="normal" font="default" size="100%">Christine C Ghetu</style></author><author><style face="normal" font="default" size="100%">Diana Rohlman</style></author><author><style face="normal" font="default" size="100%">Kaley A Adams</style></author><author><style face="normal" font="default" size="100%">Kim A Anderson</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A Comprehensive Comparison of Indoor vs Outdoor Air Quality Across the United States</style></title><secondary-title><style face="normal" font="default" size="100%">International Society of Exposure Science</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">09/2020</style></date></pub-dates></dates><language><style face="normal" font="default" size="100%">eng</style></language></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kyra A Murrel</style></author><author><style face="normal" font="default" size="100%">Christine C Ghetu</style></author><author><style face="normal" font="default" size="100%">Frank L Dorman</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">The combination of spectroscopy, microscopy, and profilometry methods for the physical and chemical characterization of environmentally relevant microplastics</style></title><secondary-title><style face="normal" font="default" size="100%">Analytical Methods</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2018</style></year><pub-dates><date><style  face="normal" font="default" size="100%">10/2018</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">Analytical Methods</style></publisher><volume><style face="normal" font="default" size="100%">10</style></volume><pages><style face="normal" font="default" size="100%">4909-4916</style></pages><isbn><style face="normal" font="default" size="100%">10.1039/C8AY01826J</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Environmental pollution related to microplastics (MPs) is a growing concern across the globe. In addition to the primary concern of MP levels in the environment, they have also been known to sorb a variety of organic materials, concentrating and transporting them into the environment and aquatic life. The focus of this study was to evaluate differences in surface characteristics and chemical composition of neat MP standards relative to MP samples extracted from personal care products and wastewater effluent. MPs were first chemically characterized using Attenuated Total Reflectance (ATR) Fourier Transform Infrared Spectroscopy (FT-IR) to determine their composition, then physically characterized using Scanning Electron Microscopy (SEM) and Optical Profilometry (OP). Under SEM and OP imaging, neat polyethylene MP standards appeared uniform in spherical shape with a smooth surface displaying shallow pitting. MPs extracted from personal care products were characterized as polyethylene and many of these samples displayed a significant distortion from the spherical shape of the neat standards with crevices ranging at various depths. MPs extracted from a Waste Water Treatment Plant (WWTP) effluent tank were characterized as polyethylene and other unidentified plastic polymers. Through SEM and OP, the WWTP effluent extracted MPs were seen to have similar surface characteristics to the personal care product extracted spherical MPs, demonstrating deep pits and large flat top peaks. OP was used to quantitatively compare the MPs by three surface roughness parameters. This proof-of-concept study is the first to utilize FT-IR, SEM and OP for the surface characterization of MP samples. Combining these three methods allows for the chemical identification of MPs along with the qualitative and quantitative comparison of their surface characteristics, demonstrating that MPs extracted from personal care products and WWTP effluent differ greatly from neat microsphere standards of similar sizes.&lt;/p&gt;
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