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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
environmental science
Oxygen isotope signature of UV degradation of glyphosate and phosphonoacetate: Tracing sources and cycling of phosphonates
Journal of Hazardous Materials, Volume 260, Year 2013
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Description
The degradation of phosphonates in the natural environment constitutes a major route by which orthophosphate (Pi) is regenerated from organic phosphorus and recently implicated in marine methane production, with ramifications to environmental pollution issues and global climate change concerns. This work explores the application of stable oxygen isotope analysis in elucidating the C. P bond cleavage mechanism(s) of phosphonates by UV photo-oxidation and for tracing their sources in the environment. The two model phosphonates used, glyphosate and phosphonoacetic acid were effectively degraded after exposure to UV irradiation. The isotope results indicate the involvement of both ambient water and atmospheric oxygen in the C. P bond cleavage and generally consistent with previously posited mechanisms of UV-photon excitation reactions. A model developed to calculate the oxygen isotopic composition of the original phosphonate P-moiety, shows both synthetic phosphonates having distinctly lower values compared to naturally derived organophosphorus compounds. Such mechanistic models, based on O-isotope probing, are useful for tracing the sources and reactions of phosphonates in the environment. © 2013 Elsevier B.V.
Authors & Co-Authors
Sandy, Edward H.
China, Wuhan
China University of Geosciences
United States, New Haven
Yale University
Sierra Leone, Freetown
University of Sierra Leone
Blake, Ruth E.
United States, New Haven
Yale University
China, Beijing
University of Science and Technology Beijing
Chang, Sae Jung
United States, New Haven
Yale University
Yao, Jun
China, Wuhan
China University of Geosciences
United States, New Haven
Yale University
China, Beijing
University of Science and Technology Beijing
Yu, Chan
United States, New Haven
Yale University
China, Beijing
University of Science and Technology Beijing
Statistics
Citations: 47
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.1016/j.jhazmat.2013.06.057
ISSN:
03043894
e-ISSN:
18733336
Research Areas
Environmental