Monitoring pesticides in the soil, groundwater, and submarine groundwater discharge of the Chesapeake Bay Area

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dc.contributor.authorSchicho, Douglas Lindenen
dc.contributor.departmentEnvironmental Engineeringen
dc.date.accessioned2014-03-14T21:44:40Zen
dc.date.adate2009-09-05en
dc.date.available2014-03-14T21:44:40Zen
dc.date.issued1993en
dc.date.rdate2009-09-05en
dc.date.sdate2009-09-05en
dc.description.abstractThe first objective of this research was to determine if pesticides were leaching into the shallow groundwater beneath agricultural sites, and if so, to determine a correlation between soil and groundwater pesticide concentrations. The second was to examine the correlation between pesticide concentrations measured by gas chromatography with electron capture detector (GC/ECD) and an immunoassay method developed by OHMICRON Corporation. Samples from four agricultural and one reference (undeveloped) site were analyzed for pesticides over an 11 month period from April, 1992 to February, 1993. One hundred and nineteen separate groundwater samples were analyzed for: alachlor, atrazine, carbofuran, cyanazine, and metolachlor. Pesticide analysis of groundwater and seepage meter water was carried out by immunoassay and by solid phase extraction (SPE) with octadecyl bonded extraction disks followed by GC/ECD. Fifty-five soil and sediment samples were Soxhlet extracted followed by gas chromatography/mass spectrometry (GC/MS). Pesticides were detected in 13.4% groundwater samples by GC/ECD with only one detection being greater than 1 ppb. The immunoassay method detected pesticides in 32% of the groundwater samples with the majority of these detections also being below 1 ppb. Alachlor and/or metolachlor were detected in 44% of the soil samples at concentrations ranging from 7 ppb to 485 ppb. The study concluded that the majority of the target pesticides were being adsorbed by the soil and only limited amounts, less than 1 ppb, were being transported to the groundwater. It was also concluded that the immunoassay had lower limits of detection, but may yield some false positive results.en
dc.description.degreeMaster of Scienceen
dc.format.extentxvii, 215 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-09052009-040652en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09052009-040652/en
dc.identifier.urihttp://hdl.handle.net/10919/44587en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1993.S342.pdfen
dc.relation.isformatofOCLC# 29687376en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1993.S342en
dc.subject.lcshGroundwateren
dc.subject.lcshPesticides -- Environmental aspects -- Measurementen
dc.subject.lcshSoils -- Pesticide content -- Chesapeake Bay Region (Md and Va)en
dc.titleMonitoring pesticides in the soil, groundwater, and submarine groundwater discharge of the Chesapeake Bay Areaen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineEnvironmental Planningen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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