Impact of bromide exposure on natural organochlorine loss from coastal wetland soils in the Winyah Bay, South Carolina

Schlesinger, Danielle R.; Myneni, Satish C. B.

doi:10.1039/c9em00604d

Impact of bromide exposure on natural organochlorine loss from coastal wetland soils in the Winyah Bay, South Carolina

Journal Article · Thu Feb 20 23:00:00 EST 2020 · Environmental Science: Processes & Impacts

DOI:https://doi.org/10.1039/c9em00604d· OSTI ID:1605437

^[1]; Myneni, Satish C. B. ^[1]

Princeton Univ., NJ (United States)

Naturally formed halogenated organic compounds are common in terrestrial and marine environments and play an important role in the halogen cycle. Among these halogenated compounds, chlorinated organic compounds are the most common halogenated species in all soils and freshwater sediments. This study evaluated how a previously observed phenomenon of bromination of organic matter in coastal soils due to salt-water intrusion impacts the stability and fate of natural organochlorine (org-Cl) in coastal wetland soils. In this work, the reacted solid and liquid samples were analyzed using X-ray spectroscopy (in cm and at micron scales for solids) and ion chromatography. We find that introduction of Br^- species and their subsequent reactions with organic carbon are associated with an average of 39% loss of org-Cl species from leaf litter and soil. The losses are more prominent in org-Cl hotspots of leaf litter, and both aliphatic and aromatic organochlorine compounds are lost from all samples at high Br^- concentrations. The combination of solid and aqueous phase analysis suggests that org-Cl loss is most likely largely associated with volatilization of org-Cl. Release of labile org-Cl compounds has detrimental environmental implications for both ecosystem toxicity, and stratospheric ozone. The reactions similar to those observed here can also have implications for the reactions of xenobiotic chlorinated compounds in soils.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Sponsoring Organization:: National Science Foundation (NSF); Phillips Equipment Fund; Princeton Environmental Institute; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: AC02-76SF00515; AC02-06CH11357; FG02-94ER14466; SC0012704

OSTI ID:: 1605437

Alternate ID(s):: OSTI ID: 1690075

Journal Information:: Environmental Science: Processes & Impacts, Journal Name: Environmental Science: Processes & Impacts Journal Issue: 3 Vol. 22; ISSN 2050-7887

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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