{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/83107"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/83107","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Mercury-Thiourea Complex Ion Chromatography With on-Line Cold Vapor Generation and Atomic Fluorescence Spectrometric Detection (hgtu/ic-Cvafs)","abstract":"Two specialized sample preparation chemistries were developed to be used with the sample introduction methods of the HgTu/IC-CVAFS system: one for biotic tissues, and one for sediments. A digestion system for the simultaneous measurement of MeHg and HgII in biota samples using sequential HNO3 digestion and thiourea leaching coupled to on-line thiolic preconcentration has been designed for use with the system and shown to give accurate results with biotic reference materials and have limits of detection of ∼10 pg g-1 with 100 mg of dried sample. A specific solvent extraction for quantitative recovery of MeHg in high organic-carbon sediments, using HNO3, HCl and CuSO4 in the aqueous phase leaching solution and toluene for an organic solvent phase, has been developed for coupling to on-line thiolic preconcentration. The application have been proven accurate with reference materials and shows ∼100% recovery from polluted wetland sediments, a test which variably yielded between ∼70--85% recovery from a commonly used solvent extraction procedure employing H 2SO4, KBr, and CuSO4.","abstract_html":"Two specialized sample preparation chemistries were developed to be used with the sample introduction methods of the HgTu/IC-CVAFS system: one for biotic tissues, and one for sediments. A digestion system for the simultaneous measurement of MeHg and HgII in biota samples using sequential HNO3 digestion and thiourea leaching coupled to on-line thiolic preconcentration has been designed for use with the system and shown to give accurate results with biotic reference materials and have limits of detection of ∼10 pg g-1 with 100 mg of dried sample. A specific solvent extraction for quantitative recovery of MeHg in high organic-carbon sediments, using HNO3, HCl and CuSO4 in the aqueous phase leaching solution and toluene for an organic solvent phase, has been developed for coupling to on-line thiolic preconcentration. The application have been proven accurate with reference materials and shows ∼100% recovery from polluted wetland sediments, a test which variably yielded between ∼70--85% recovery from a commonly used solvent extraction procedure employing H 2SO4, KBr, and CuSO4.","abstract_has_math":false,"creators":["Shade, Christopher William"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Natural Resrouces and Environmental Sciences","degree_department":null,"school":null,"contributors":["Hudson, Robert J.M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T21:00:31Z","date_published":"2015-09-25T21:00:31Z","updated_at":"2026-07-22T22:26:20Z","subjects":["Geochemistry"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3182376"],"render_values":[{"text":"(MiAaPQ)AAI3182376","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/83107","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Hudson, Robert J.M."]},{"key":"dc:creator","label":"Author","values":["Shade, Christopher William"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T21:00:31Z","10000-01-01","2005"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Natural Resrouces and Environmental Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Geochemistry"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/83107","(MiAaPQ)AAI3182376"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Two specialized sample preparation chemistries were developed to be used with the sample introduction methods of the HgTu/IC-CVAFS system: one for biotic tissues, and one for sediments. A digestion system for the simultaneous measurement of MeHg and HgII in biota samples using sequential HNO3 digestion and thiourea leaching coupled to on-line thiolic preconcentration has been designed for use with the system and shown to give accurate results with biotic reference materials and have limits of detection of ∼10 pg g-1 with 100 mg of dried sample. A specific solvent extraction for quantitative recovery of MeHg in high organic-carbon sediments, using HNO3, HCl and CuSO4 in the aqueous phase leaching solution and toluene for an organic solvent phase, has been developed for coupling to on-line thiolic preconcentration. The application have been proven accurate with reference materials and shows ∼100% recovery from polluted wetland sediments, a test which variably yielded between ∼70--85% recovery from a commonly used solvent extraction procedure employing H 2SO4, KBr, and CuSO4.","Made available in DSpace on 2015-09-25T21:00:31Z (GMT). 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A digestion system for the simultaneous measurement of MeHg and HgII in biota samples using sequential HNO3 digestion and thiourea leaching coupled to on-line thiolic preconcentration has been designed for use with the system and shown to give accurate results with biotic reference materials and have limits of detection of ∼10 pg g-1 with 100 mg of dried sample. A specific solvent extraction for quantitative recovery of MeHg in high organic-carbon sediments, using HNO3, HCl and CuSO4 in the aqueous phase leaching solution and toluene for an organic solvent phase, has been developed for coupling to on-line thiolic preconcentration. The application have been proven accurate with reference materials and shows ∼100% recovery from polluted wetland sediments, a test which variably yielded between ∼70--85% recovery from a commonly used solvent extraction procedure employing H 2SO4, KBr, and CuSO4.","Made available in DSpace on 2015-09-25T21:00:31Z (GMT). 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