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Environmental dynamics of Benomyl and Thiabendazole

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dc.contributor.authorBalasubrahmanyam, Sunil K.en
dc.contributor.committeechairBoardman, Gregory D.en
dc.contributor.committeememberRandall, Clifford W.en
dc.contributor.committeememberReneau, Raymond B. Jr.en
dc.contributor.departmentEnvironmental Sciences and Engineeringen
dc.date.accessioned2014-09-11T12:44:44Zen
dc.date.adate2013-12-18en
dc.date.available2014-09-11T12:44:44Zen
dc.date.issued1986-03-01en
dc.date.rdate2013-12-18en
dc.date.sdate2013-12-18en
dc.description.abstractThe comprehensive environmental dynamics of the heterocyclic Benzimidazole fungicides, Benomyl and Thiabendazole was investigated. This included examining their fate and distribution in the terrestrial and aquatic phases of a laboratory microcosm comprised of silty clay loam soil and plants. The soil component constituted a major relocation site, with approximately 45 and 75% of initial Benomyl (recovered as MBC) and Thiabendazole concentrations being recovered from the soil component of the microcosm, respectively, while 53 and 27% translocated into corn plants. The adsorption mechanism/s of these fungicides onto soil components were investigated using silty clay loam, silty loam and sandy soils as well as Ca-bentonite. These studies indicated that both fungicides were adsorbed to the highest degree on silty clay loam, followed by silty loam and sandy soils. Their adsorption on Ca-bentonite was found to be a function of the pH of the suspension, suggesting that in the presence of increasing ll *activity on the clay surfaces, Benomyl and Thiabendazole become protonated to form positively charged molecules. These may then react with the clay surfaces forming Fungicide-clay complexes. The effect of different CaCl, concentrations on the adsorption process demonstrated that an increase in the salt concentration, at a constant pH resulted in a decrease in the amounts of adsorbed fungicide. The transport of the fungicides (adsorbed onto soil particles) as a consequence of scdiment runoff into aquatic systems was also estimated. Results of the simulation of overland sediment runoff from sections of the Chowan river basin into the Meherrin river following a rainstorm, indicate that significant quantities of Benomyl and Thiabendazole could be transported into aquatic systems. Adsorption studies also indicated that the adsorption process is reversible. Thus, any significant increases in the pH of receiving bodies of water could result in the release of Benomyl and Thiabendazole from sediment causing a contamination of the aquatic system.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 94 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-12182013-040027en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12182013-040027/en
dc.identifier.urihttp://hdl.handle.net/10919/50496en
dc.language.isoen_USen
dc.publisherVirginia Techen
dc.relation.isformatofOCLC# 16264229en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1986.B358en
dc.subject.lcshRunoffen
dc.subject.lcshSoil absorption and adsorptionen
dc.subject.lcshWater -- Microbiologyen
dc.titleEnvironmental dynamics of Benomyl and Thiabendazoleen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineEnvironmental Sciences and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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