Role of in Situ Natural Organic Matter in Mobilizing As during Microbial Reduction of FeIII -Mineral-Bearing Aquifer Sediments from Hanoi (Vietnam)

Environmental Science & Technology
M GlodowskaAndreas Kappler

Abstract

Natural organic matter (NOM) can contribute to arsenic (As) mobilization as an electron donor for microbially-mediated reductive dissolution of As-bearing Fe(III) (oxyhydr)oxides. However, to investigate this process, instead of using NOM, most laboratory studies used simple fatty acids or sugars, often at relatively high concentrations. To investigate the role of relevant C sources, we therefore extracted in situ NOM from the upper aquitard (clayey silt) and lower sandy aquifer sediments in Van Phuc (Hanoi area, Vietnam), characterized its composition, and used 100-day microcosm experiments to determine the effect of in situ OM on Fe(III) mineral reduction, As mobilization, and microbial community composition. We found that OM extracted from the clayey silt (OMC) aquitard resembles young, not fully degraded plant-related material, while OM from the sandy sediments (OMS) is more bioavailable and related to microbial biomass. Although all microcosms were amended with the same amount of C (12 mg C/L), the extent of Fe(III) reduction after 100 days was the highest with acetate/lactate (43 ± 3.5% of total Fe present in the sediments) followed by OMS (28 ± 0.3%) and OMC (19 ± 0.8%). Initial Fe(III) reduction rates were also higher w...Continue Reading

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Citations

Feb 3, 2021·Nature Reviews. Microbiology·Andreas KapplerElizabeth D Swanner
May 26, 2021·The Science of the Total Environment·Martyna GlodowskaAndreas Kappler
Jun 10, 2021·Water Research·Emiliano StopelliUNKNOWN AdvectAs team members
Jul 22, 2021·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Anumeha SahaPinaki Sar
Jul 16, 2021·Journal of Hazardous Materials·Xiaonan FengHeping Li
Jul 22, 2021·Environmental Science & Technology·Andreas FritzscheKai U Totsche

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