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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.|
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2005.
|Date Available in IDEALS:||2015-09-25|
This item appears in the following Collection(s)
Dissertations and Theses - Natural Resources and Environmental Sciences
Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois