Award Date

1-1-1990

Degree Type

Thesis

Degree Name

Master of Science (MS)

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

pdf

File Size

3.55 MB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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