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Project Information

COLLABORATIVE RESEARCH: SELENIUM REDOX REACTIONS AND ISOTOPE RATIOS: THE ROLE OF MICROBIAL AND ABIOTIC SELENIUM OXIDATION

Agency:
NSF

National Science Foundation

Project Number:
1530089
Contact PI / Project Leader:
YEE, NATHAN
Awardee Organization:
RUTGERS THE ST UNIV OF NJ NEW BRUNSWICK

Description

Abstract Text:
Selenium (Se) is an essential micronutrient, a potential environmental contaminant, and an indicator of chemical reactions involving oxidation and reduction, in both present and past environmental systems. Chemical and biological processes control the mobility and environmental impact of Se. Although Se oxidation is an important Se-mobilizing process, our understanding of this process is limited. Additionally, although measurements of variations in Se stable isotope abundances (82Se/76Se ratios) provide a powerful new way to study key chemical reactions involving Se in modern and ancient environments, poor understanding of Se stable isotope shifts caused by Se oxidation limits interpretation of Se isotope data. Therefore, this project will investigate stable Se isotope variation caused by oxidation as a means to achieve a robust understanding of Se oxidation in the environment. Investigators will train one postdoctoral fellow, two doctoral students, and 6-8 undergraduate students per year through programs that target underrepresented students. The societal benefits of this project include communications with the concerned governmental agencies to enable better assessments of Se fate linked to human nutritional adequacy, toxic thresholds and the fundamental understanding of Se in the earth system.

The scope of the project is to integrate stable isotope geochemistry and microbiology to gain an improved understanding of biotic and abiotic Se oxidation. The specific objectives are to (1) demonstrate that microbial Se oxidation supports chemoautotrophic growth, (2) determine the magnitude of Se isotopic fractionation caused by microbial and abiotic oxidation of reduced Se-species, and (3) examine oxidation of Se in natural soil/sediment matrices to determine how the laboratory-derived fractionation factors will apply in natural environments. Controlled laboratory experiments will be conducted to determine reaction rates and Se isotope fractionation during microbial and abiotic Se oxidation. Slurry experiments with soils and sediments of two different field sites will provide complementary understanding of Se oxidation in natural samples under well-defined conditions. By establishing a link between Se oxidation and Se isotope fractionation, the results will open new avenues for studies of Se cycling and the fate of Se as a micronutrient and contaminant.
Project Terms:
Biological Process; chemical reaction; Chemicals; Communication; Data; doctoral student; Environment; Environmental Impact; Environmental Pollution; Fractionation; Growth; Human; improved; Isotopes; Laboratories; Link; Measurement; microbial; Microbiology; Micronutrients; Nutritional; oxidation; Oxidation-Reduction; Postdoctoral Fellow; Process; programs; Reaction; reaction rate; Research; Research Personnel; research study; Role; Sampling; Selenium; Site; Soil; stable isotope; System; Training; undergraduate student; Underrepresented Students; Variant

Details

Contact PI / Project Leader Information:
Name:  YEE, NATHAN
Other PI Information:
Not Applicable
Awardee Organization:
Name:  RUTGERS THE ST UNIV OF NJ NEW BRUNSWICK
City:  NEW BRUNSWICK    
Country:  UNITED STATES
Congressional District:
State Code:  NJ
District:  06
Other Information:
Fiscal Year: 2015
Award Notice Date: 07-Aug-2015
DUNS Number: 001912864
Project Start Date: 01-Sep-2015
Budget Start Date:
CFDA Code: 47.050
Project End Date: 31-Aug-2018
Budget End Date:
Agency: ?

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National Science Foundation
Project Funding Information for 2015:
Year Agency

Agency: The entity responsible for the administering of a research grant, project, or contract. This may represent a federal department, agency, or sub-agency (institute or center). Details on agencies in Federal RePORTER can be found in the FAQ page.

FY Total Cost
2015 NSF

National Science Foundation

$78,042

Results

i

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