期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 53, 期 18, 页码 10792-10802出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.9b03924
关键词
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资金
- German Research Foundation [PL 302/20-1]
- BayIntAn mobility grant [BaylntAn_UBT_2017_23]
- Academy of Finland grant [287397]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00.515]
- U.S. Department of Energy, Office of Biological and Environmental Research (BER), Subsurface Biogeochemical Research (SBR) program [DE-AC02-76SF00515]
- [DAAD 57314604]
- [DAAD 57315737]
- Academy of Finland (AKA) [287397, 287397] Funding Source: Academy of Finland (AKA)
Peatlands and other wetlands are sinks for antimony (Sb), and solid natural organic matter (NOM) may play an important role in controlling Sb binding. However, direct evidence of Sb sequestration in natural peat samples is lacking. Here, we analyzed solid phase Sb, iron (Fe), and sulfur (5) as well as aqueous Sb speciation in three profiles up to a depth of 80 cm in a mine water impacted peatland in northern Finland. Linear combination fittings of extended X-ray absorption fine structure spectra showed that Sb binding to Fe phases was of minor importance and observed only in the uppermost layers of the peatland. Instead, the dominant (to almost exclusive) sequestration mechanism was Sb(III) binding to oxygen-containing functional groups, and at greater depths, increasingly Sb(III) binding to thiol groups of NOM. Aqueous Sb speciation was dominated by antimonate, while antimonite concentrations were low, further supporting our findings of much higher reactivity of Sb(III) than Sb(V) toward peat surfaces. Insufficient residence time for efficient reduction of antimonate to antimonite currently hinders higher Sb removal in the studied peatland. Overall, our findings imply that Sb(III) binding to solid NOM acts as an important sequestration mechanism under reducing conditions in peatlands and other high-organic matter environments.
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