Mercury-Thiourea Complex Ion Chromatography With on-Line Cold Vapor Generation and Atomic Fluorescence Spectrometric Detection (hgtu/ic-Cvafs)

Shade, Christopher William

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Description

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

Issue Date

2005

Doctoral Committee Chair(s)

Hudson, Robert J.M.

Department of Study

Natural Resrouces and Environmental Sciences

Discipline

Natural Resrouces and Environmental Sciences

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Geochemistry

Language

eng

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.

Graduation Semester

2005

Type of Resource

text

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http://hdl.handle.net/2142/83107

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