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Title:Mercury-Thiourea Complex Ion Chromatography With on-Line Cold Vapor Generation and Atomic Fluorescence Spectrometric Detection (hgtu/ic-Cvafs)
Author(s):Shade, Christopher William
Doctoral Committee Chair(s):Hudson, Robert J.M.
Department / Program:Natural Resrouces and Environmental Sciences
Discipline:Natural Resrouces and Environmental Sciences
Degree Granting Institution:University of Illinois at Urbana-Champaign
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.
Issue Date:2005
Description:85 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2005.
Other Identifier(s):(MiAaPQ)AAI3182376
Date Available in IDEALS:2015-09-25
Date Deposited:2005

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