Peat Bogs as Hotspots for Organoarsenical Formation and Persistence

Mikutta, Christian; Rothwell, James J.

doi:10.1021/acs.est.5b06182

Title: Peat Bogs as Hotspots for Organoarsenical Formation and Persistence

Journal Article · Fri Apr 01 00:00:00 EDT 2016 · Environmental Science and Technology

DOI:https://doi.org/10.1021/acs.est.5b06182· OSTI ID:1245031

Mikutta, Christian ^[1]; Rothwell, James J. ^[2]

Section for Environmental Chemistry and Physics, Department of Plant and Environmental Sciences, University of Copenhagen, DK-1871 Frederiksberg C, Denmark, Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, CHN, ETH Zurich, 8092 Zurich, Switzerland
Upland Environments Research Unit, Geography, School of Environment, Education and Development, The University of Manchester, Manchester M13 9PL, U.K.

Here, peatlands have received significant atmospheric inputs of As and S since the onset of the Industrial Revolution, but the effect of S deposition on the fate of As is largely unknown. It may encompass the formation of As sulfides and organosulfur-bound As, or the indirect stimulation of As biotransformation processes, which are presently not considered as important As immobilization pathways in wetlands. To investigate the immobilization mechanisms of anthropogenically derived As in peatlands subjected to long-term atmospheric pollution, we explored the solid-phase speciation of As, Fe, and S in English peat bogs by X-ray absorption spectroscopy. Additionally, we analyzed the speciation of As in pore- and streamwaters. Linear combination fits of extended X-ray absorption fine structure (EXAFS) data imply that 62–100% (average: 82%) of solid-phase As (As_tot: 9–92 mg/kg) was present as organic As(V) and As(III). In agreement with appreciable concentrations of organoarsenicals in surface waters (pH: 4.0–4.4, Eh: 165–190 mV, average Astot: 1.5–129 μg/L), our findings reveal extensive biotransformation of atmospheric As and the enrichment of organoarsenicals in the peat, suggesting that the importance of organometal(loid)s in wetlands subjected to prolonged air pollution is higher than previously assumed.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-76FS00515

OSTI ID:: 1245031

Alternate ID(s):: OSTI ID: 1249097

Journal Information:: Environmental Science and Technology, Journal Name: Environmental Science and Technology Vol. 50 Journal Issue: 8; ISSN 0013-936X

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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