Uptake and depuration rates of bulk ZnO powder, ZnCl2, and ZnO nanoparticles by Eisenia fetida before and after soil weathering: the potential for trophic transfer

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dc.contributor.advisorLev, Steven M.
dc.contributor.authorSchulze, Megan Elizabeth
dc.contributor.programTowson University. Environmental Science and Studies Program
dc.date.accessioned2015-12-17T19:38:44Z
dc.date.available2015-12-17T19:38:44Z
dc.date.issued2014-02-20
dc.date.submitted2014-01
dc.description(M.S.) -- Towson University, 2014.
dc.description.abstractThe earthworm Eisenia fetida was exposed to three treatments of isotopically-labeled zinc (68ZnCl2, bulk 68ZnO, and 68ZnO nanoparticles (NPs) at 148 mg/kg Zn) amended to topsoil for 21 days followed by 21 days in a "clean" topsoil to assess uptake and elimination rates (Initial). The exposure was repeated following a 21 day soil-aging period (Aged). All Zn treatments followed the same two-compartment elimination pattern. During the Initial experiment, bulk 68ZnO demonstrated slower uptake in compartment one than 68ZnCl2 and 68ZnO NPs, then matched the rates of other treatments during the Aged experiment. A significant difference was observed in compartment two of the 68ZnO NP treatment in both experiments. We saw no evidence of ZnO NP retention in E. fetida to suggest the potential for trophic transfer of ZnO NPs in a terrestrial food web. These data benefit risk assessment as ZnO NP (5-30nm) mimics ZnCl2 in E. fetida.
dc.formatapplication/pdf
dc.format.extentx, 61 pages
dc.genretheses
dc.identifierdoi:10.13016/M25D9R
dc.identifier.otherTF2013Schulze
dc.identifier.urihttp://hdl.handle.net/11603/2155
dc.language.isoeng
dc.relation.ispartofTowson University Archives
dc.relation.ispartofTowson University Electronic Theses and Dissertations
dc.relation.ispartofTowson University Institutional Repository
dc.rightsCopyright protected, all rights reserved.
dc.titleUptake and depuration rates of bulk ZnO powder, ZnCl2, and ZnO nanoparticles by Eisenia fetida before and after soil weathering: the potential for trophic transfer
dc.typeText
dcterms.accessRightsThere are no restrictions on access to this document. An internet release form signed by the author to display this document online is on file with Towson University Special Collections and Archives.

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