Dioxin chronology and fluxes in sediments of the Houston Ship Channel, Texas: Influences of non-steady-state sediment transport and total organic carbon

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dc.acquisition-srcen_US
dc.call-noen_US
dc.contract-noen_US
dc.contributor.authorYeager. KMen_US
dc.contributor.authorSantschi, PHen_US
dc.contributor.authorRifai, HSen_US
dc.contributor.authorSuarez, MPen_US
dc.contributor.authorBrinkmeyer, Ren_US
dc.contributor.authorHung, CCen_US
dc.contributor.authorSchindler, KJen_US
dc.contributor.authorAndres, MJen_US
dc.contributor.authorWeaver, EAen_US
dc.contributor.otherEnvironmental Science & Technologyen_US
dc.date.accessioned2010-02-15T16:46:16Z
dc.date.available2010-02-15T16:46:16Z
dc.date.issuedAug. 1 2007en_US
dc.degreeen_US
dc.descriptionpgs. 5291-5298en_US
dc.description-otheren_US
dc.description.abstractPolychlorinated dibenzo-p-dioxins and dibenzofurans (dioxins) are persistent contaminants that bioaccumulate and pose serious risks to humans. The primary objective of this study was to determine the history and mechanisms of dioxin accumulation in sediments of the Houston Ship Channel (HSC) using analytical data on natural and anthropogenic radionuclides (Be-7, Cs-137, and Pb-210) and dioxins. Results showed that present-day sedimentary dioxin accumulation rates are orders of magnitude higher than atmospheric inputs to the HSC. Most stations showed dioxin peaks in the near surface, indicating continuing inputs despite federal regulations. Stations with high dioxin inventories reflect accentuated accumulation in the HSC as one moves west toward Houston, at the confluence of the HSC and the San Jacinto River and upstream in the San Jacinto River. These results indicate that a significant quantity of dioxins continues to be released into the environment here or that sedimentary storage and release of previously supplied dioxins is significant, or both. The results support the interpretation that the HSC is influenced by episodic sediment resuspension, erosion and lateral transport processes driven by tides, wind, shipping, and dredging, which can cause intermittently high accumulations of dioxins, and underscores the need for additional research on the roles of sedimentary processes in organic contaminant bioavailability.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeGalveston Bay: Houston Ship Channelen_US
dc.geo-codeSan Jacinto Riveren_US
dc.history1-16-09 kswen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/18547
dc.latitudeen_US
dc.locationNot available in house - Please contact GBIC for assistanceen_US
dc.longitudeen_US
dc.notesen_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries10069.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectaccumulationen_US
dc.subjectdibenzo-p-dioxinsen_US
dc.subjectestuarineen_US
dc.subjectradionuclideen_US
dc.titleDioxin chronology and fluxes in sediments of the Houston Ship Channel, Texas: Influences of non-steady-state sediment transport and total organic carbonen_US
dc.typeArticleen_US
dc.universityen_US
dc.vol-issue41(15)en_US

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