Hydrologic Control on Arsenic Cycling at the Groundwater–Surface Water Interface of a Tidal Channel
550
climate action
Climate Change
arsenic
hydrogeochemistry
industrial contamination
Water
Fresh Water
551
01 natural sciences
6. Clean water
Arsenic
13. Climate action
redox
tide
groundwater−surface water interaction
Groundwater
Water Pollutants, Chemical
0105 earth and related environmental sciences
DOI:
10.1021/acs.est.2c05930
Publication Date:
2022-12-19T19:57:25Z
AUTHORS (8)
ABSTRACT
Historical industrial activities have resulted in soil contamination at sites globally. Many of these sites are located along coastlines, making them vulnerable to hydrologic and biogeochemical alterations due to climate change and sea-level rise. However, the impact of hydrologic dynamics on contaminant mobility in tidal environments has not been well studied. Here, we collected data from pressure transducers in wells, multi-level redox sensors, and porewater samplers at an As-contaminated site adjacent to a freshwater tidal channel. Results indicate that sharp redox gradients exist and that redox conditions vary on tidal to seasonal timescales due to sub-daily water level fluctuations in the channel and seasonal groundwater-surface water interactions. The As and Fe2+ concentrations decreased during seasonal periods of net discharge to the channel. The seasonal changes were greater than tidal variations in both Eh and As concentrations, indicating that impacts of the seasonal mechanism are stronger than those of sub-daily water table fluctuations. A conceptual model describing tidal and seasonal hydro-biogeochemical coupling is presented. These findings have broad implications for understanding the impacts of sea-level rise on the mobility of natural and anthropogenic coastal solutes.
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