Arsenic is a potentially toxic contaminant of concern even at relatively low concentrations in the environment. The complex chemistry of arsenic in the environment is influenced by a variety of chemical and physical factors…
Contents
CHAPTER 1. BACKGROUND, STUDY OBJECTIVES AND HYPOTHESIS
1.1 BACKGROUND
1.1.1 Consideration of risk at arsenic contaminated sites
1.1.2 Adsorption
1.1.3 Influence of Redox Potential
1.1.4. Microbial Influences of Arsenic
1.1.5. Methods for Characterizing Arsenic Mobility
1.2 STUDY OBJECTIVES AND HYPOTHESIS
CHAPTER 2. MATERIALS AND METHODS
2.1 CHEMICAL REAGENTS
2.2 SAMPLES
2.2.1 Samples from Site in Mexico
2.2.2 Sediment Sample from West Fork River, West Virginia
2.2.3 Samples from AUES FUDS
2.2.4 Samples Associated with Poultry Litter
2.2.5 Sample from Residence in Maryland
2.2.6 General Sample Characteristics
2.3 METHODS
2.3.1 Measurement of pH and Eh
2.3.2 Sequential Extraction Method
2.3.3 Microwave Digestion Method
2.3.4 Arsenic Analysis via HG-AAS
2.3.5 Mobility Experiments
2.3.6 Bioavailability of Arsenic
CHAPTER 3. RESULTS AND DISCUSSION (MEXICAN MINE TAILING
AND ASSOCIATE SAMPLES)
3.1 MICROWAVE DIGESTION RESULTS
3.2 SEQUENTIAL EXTRACTION METHOD RESULTS
3.3 SIMULATED BIOAVAILABLE EXTRACTION RESULTS
3.4 MOBILIZATION EXPERIMENTS
3.4.1 Sample selection
3.4.2 Mechanisms expected to influence arsenic mobilization
3.4.3 Results and discussion
3.4.4 Analysis of arsenic mobilization trends
CHAPTER 4. RESULTS AND DISCUSSION (AMERICAN UNIVERSITY EXPERIMENT STATION SAMPLES, POULTRY LITTER AND
ASSOCIATED SAMPLES, RESIDENTIAL SAMPLE, AND WEST FORK RIVER SEDIMENT SAMPLE)
4.1 MICROWAVE DIGESTION RESULTS
4.2 SEQUENTIAL EXTRACTION METHOD RESULTS
4.3 SIMULATED BIOAVAILABILITY EXTRACTION
4.4 MOBILIZATION EXPERIMENTS
4.4.1 Sample selection
4.4.2 Mechanisms expected to influence arsenic mobilization
4.4.3 Results and discussion
4.4.4 Analysis of arsenic mobilization trends
CHAPTER 5. CONCLUSIONS AND RECOMMENDED FURTHER STUDIES
5.1 CONCLUSIONS
5.2 RECOMMENDED FURTHER STUDIES
APPENDIX
REFERENCES
Author: Peterson, Michael Clayton
Source: University of Maryland
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