Arsenic associated with mineral matrices seldom poses a direct environmental risk, whereas arsenic that is mobilized in the aqueous phase poses a potential threat to human and environmental health. Consequently, controlling arsenic's sequestration by solids also controls its associated risk. Chemical reactions of arsenic occurring at the solid-water interface (including adsorption and desorption, precipitation and dissolution, and reduction and oxidation) not only govern the release of arsenic into water, but form the basis of arsenic removal technologies. Thus, the enhanced fundamental understanding of arsenic behavior at critical solid-water interfaces that this project expects to achieve can be applied to both prevention and remediation of arsenic contamination. Iron-based solids are typically used to remove arsenic from contaminated water and are the typical solids with which arsenic is associated in natural aerobic environments. However, our current work has shown they are unstable when placed in the anaerobic environments that typify many arsenic-bearing waste disposal sites. The reverse is true for arsenic associated with sulfides, such as at mine impacted sites, where the shift from anaerobic to aerobic environments stimulates arsenic release. Thus, the behavior of minerals containing iron and sulfide when subjected to changing redox environments is the primary focus of the proposed work. The project's specific aims are to determine the mechanisms and pathways for 1) arsenic association with iron solids and 2) arsenic association with sulfur solids, and to develop 3) engineered intervention approaches that utilize biological and biogeochemical mineral retention processes to minimize arsenic release from solid wastes. These solid-arsenic-water reactions of interest are typically microbially mediated and may take multiple pathways and lead to multiple final solid phases with varying capacity for arsenic retention. Because of the complexity of the relevant processes, the project includes experts in aqueous geochemistry, microbiology, chemical dynamic modeling, process engineering and spectroscopy.

Public Health Relevance

Arsenic is the second most prevalent metal at NPL sites and the highest rated pollutant on the CERCLA priority list. Arsenic remediation at contaminated sites and mitigation of its release from natural sources depends on sequestration by solids. The proposed work will provide critical insight into the processes that impact arsenic retention by solids and what intervention may be most effective to minimize its mobilization.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Hazardous Substances Basic Research Grants Program (NIEHS) (P42)
Project #
5P42ES004940-23
Application #
8378313
Study Section
Special Emphasis Panel (ZES1-LWJ-M)
Project Start
Project End
Budget Start
2012-04-01
Budget End
2013-03-31
Support Year
23
Fiscal Year
2012
Total Cost
$325,232
Indirect Cost
$125,733
Name
University of Arizona
Department
Type
DUNS #
806345617
City
Tucson
State
AZ
Country
United States
Zip Code
85721
Youn, Jong-Sang; Csavina, Janae; Rine, Kyle P et al. (2016) Hygroscopic Properties and Respiratory System Deposition Behavior of Particulate Matter Emitted By Mining and Smelting Operations. Environ Sci Technol 50:11706-11713
Olivares, Christopher I; Sierra-Alvarez, Reyes; Abrell, Leif et al. (2016) Zebrafish embryo toxicity of anaerobic biotransformation products from the insensitive munitions compound 2,4-dinitroanisole. Environ Toxicol Chem 35:2774-2781
Rehman, Zahir Ur; Khan, Sardar; Qin, Kun et al. (2016) Quantification of inorganic arsenic exposure and cancer risk via consumption of vegetables in southern selected districts of Pakistan. Sci Total Environ 550:321-9
Zhong, Hua; Liu, Guansheng; Jiang, Yongbing et al. (2016) Effect of low-concentration rhamnolipid on transport of Pseudomonas aeruginosa ATCC 9027 in an ideal porous medium with hydrophilic or hydrophobic surfaces. Colloids Surf B Biointerfaces 139:244-8
Rodriguez-Freire, Lucia; Moore, Sarah E; Sierra-Alvarez, Reyes et al. (2016) Arsenic remediation by formation of arsenic sulfide minerals in a continuous anaerobic bioreactor. Biotechnol Bioeng 113:522-30
Beamer, Paloma I; Klimecki, Walter T; Loh, Miranda et al. (2016) Association of Children's Urinary CC16 Levels with Arsenic Concentrations in Multiple Environmental Media. Int J Environ Res Public Health 13:
Honeker, Linnea K; Root, Robert A; Chorover, Jon et al. (2016) Resolving colocalization of bacteria and metal(loid)s on plant root surfaces by combining fluorescence in situ hybridization (FISH) with multiple-energy micro-focused X-ray fluorescence (ME μXRF). J Microbiol Methods 131:23-33
Ezeh, Peace C; Xu, Huan; Lauer, Fredine T et al. (2016) Monomethylarsonous acid (MMA+3) Inhibits IL-7 Signaling in Mouse Pre-B Cells. Toxicol Sci 149:289-99
Gil-Loaiza, Juliana; White, Scott A; Root, Robert A et al. (2016) Phytostabilization of mine tailings using compost-assisted direct planting: Translating greenhouse results to the field. Sci Total Environ 565:451-61
Olivares, Christopher I; Wang, Junqin; Luna, Carlos D Silva et al. (2016) Continuous treatment of the insensitive munitions compound N-methyl-p-nitro aniline (MNA) in an upflow anaerobic sludge blanket (UASB) bioreactor. Chemosphere 144:1116-22

Showing the most recent 10 out of 425 publications