Award Date
1-1-1989
Degree Type
Thesis
Degree Name
Master of Science (MS)
Department
Chemistry
First Committee Member
David W. Emerson
Number of Pages
96
Abstract
The Silver Diethyldithiocarbamate (SDDC) Method is a widely used colorimetric technique for the determination of aqueous arsenic. The chemistry of the process is discussed in detail, and the method is compared to the other Environmental Protection Agency approved arsenic methods. Original modifications to the apparatus, allowing a more efficient reaction initiation are described. The observed detection limit of the improved procedure is 5 {dollar}\mu{dollar}g As/L (0.5 {dollar}\mu{dollar}g As). Due to the varied toxicity of arsenic compounds and oxidation states in the environment, speciation techniques are important. A review of the literature regarding the determination of individual arsenic species is presented. Methods developed for speciating inorganic arsenic with SDDC after selective hydride generation are described. The observed detection limits of 5 {dollar}\mu{dollar}g As(III)/L and 7 {dollar}\mu{dollar}g As(V)/L are considerably lower than those of previously described SDDC techniques. Organic arsenicals are neither determined nor do they interfere with inorganic speciation.
Keywords
Arsenic; Colorimetric; Determination; Silver Diethyldithiocarbamate; Silver; Speciation
Controlled Subject
Chemistry, Analytic; Environmental sciences
File Format
File Size
3635.2 KB
Degree Grantor
University of Nevada, Las Vegas
Language
English
Permissions
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Repository Citation
Fischer, Daniel Carl, "Colorimetric determination and speciation of arsenic with silver diethyldithiocarbamate" (1989). UNLV Retrospective Theses & Dissertations. 71.
http://dx.doi.org/10.25669/5x8m-gu68
Rights
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