Arsenic Speciation in Soils and Sediments

Document Type



Master of Science (MS)



First Advisor's Name

Yong Cai

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Jose R. Almirall

Third Advisor's Name

Kenneth G. Furton

Fourth Advisor's Name

Rudolf Jaffe

Date of Defense



Arsenic speciation in soils and sediments pose a great challenge due to possible conversion and/or re-adsorption. Since arsenic toxicity is dependent on its chemical species, the purpose of this research is to study the extraction process, determine what factors control species change, and develop an extraction method which preserves the arsenic species during extraction for proper quantitation. After investigating the addition of reagents such as hydroxylamine and ethylenediamine-tetraacetic acid (EDTA) without significant improvement, a method was established for the extraction of mobile or mobilizable arsenic species using phosphate and sodium diethyldithiocarbamate (NaDDC) which prevented conversion and re-adsorption. This method was applied on soils and sediments used in the construction of golf courses as well as South Florida native soil of marl type. Using an extrapolation approach, a method was also developed to estimate mobilizable arsenic species to compare and validate the method above giving similar results.



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