Organocopper complexes during roxarsone degradation in wastewater lagoons |
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| Authors: | Syam S Andra Konstantinos C Makris Shahida Quazi Dibyendu Sarkar Rupali Datta Stephan B H Bach |
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| Institution: | (1) Environmental Geochemistry Laboratory, University of Texas at San Antonio, San Antonio, TX, USA;(2) Cyprus International Institute for Environmental and Public Health in association with the Harvard School of Public Health, Cyprus University of Technology, Corner Athinon and Nikou Xiouta, Limassol, 3041, Cyprus;(3) Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN, USA;(4) Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ, USA;(5) Biological Sciences, Michigan Technological University, Houghton, MI, USA;(6) Department of Chemistry, University of Texas at San Antonio, San Antonio, TX, USA; |
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| Abstract: | Background, aim, and scope Organoarsenical-containing animal feeds that promote growth and resistance to parasites are mostly excreted unchanged, ending
up in nearby wastewater storage lagoons. Earlier work documented the partial transformation of organoarsenicals, such as,
3-nitro-4-hydroxyphenylarsonic acid (roxarsone) to the more toxic inorganic arsenate As(V)] and 3-amino-4-hydroxyphenylarsonic
acid (3-AHPAA). Unidentified roxarsone metabolites using liquid chromatography coupled to inductively coupled plasma mass
spectrometry (LC/ICP-MS) were also inferred from the corresponding As mass balance. Earlier batch experiments in our laboratory
suggested the presence of organometallic (Cu) complexes during relevant roxarsone degradation experiments. We hypothesized
that organocopper compounds were complexed to roxarsone, mediating its degradation in field-collected swine wastewater samples
from storage lagoons. The objective of this study was to investigate the role of organometallic (Cu) complexes during roxarsone
degradation under aerobic conditions in swine wastewater suspensions, using electrospray ionization mass spectrometry (ES-MS). |
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