Colorimetric determination and speciation of arsenic with silver diethyldithiocarbamate

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.

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Chemistry

Grantor dc:publisher

University of Nevada, Las Vegas

Year

1989

Author dc:creator

• Fischer, Daniel Carl

Contributors dc:contributor

• David W. Emerson

Statement dc:rights

• IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

Language dc:language

English

Identifier

https://oasis.library.unlv.edu/rtds/71

OAI identifier oai:identifier

oai:oasis.library.unlv.edu:rtds-1070