Anthropogenic activities influence the mobilization of trace metals and oxyanions in coastal sediment porewaters

Luo, Mingyue; Zhou, Chun; Ma, Tianhui; Guo, Wei; Percival, Lawrence; Baeyens, Willy; Gao, Yue

doi:10.1016/j.scitotenv.2022.156353

Cited by 12 publications

(2 citation statements)

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“…Studies have demonstrated that diverse natural processes, such as flushing rates of aquifers, dissolution of carbonate minerals, and saltwater intrusion, control the chemical release (mobilization) of redox-sensitive species like arsenic (As) into groundwater. In addition, human activities can introduce trace metals to the coastal environment. , The mobility of hazardous materials increases pressure on coastal groundwater resources and ecosystem health . So, assessing vulnerability of these important areas to As contamination due to mobilization from sediments is essential for groundwater management and environmental risk mitigation. − …”

Section: Introductionmentioning

confidence: 99%

“…In addition, human activities can introduce trace metals to the coastal environment. 1,6 The mobility of hazardous materials increases pressure on coastal groundwater resources 7 and ecosystem health. 8 So, assessing vulnerability of these important areas to As contamination due to mobilization from sediments is essential for groundwater management and environmental risk mitigation.…”

Section: ■ Introductionmentioning

confidence: 99%

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Hydrologic Control on Arsenic Cycling at the Groundwater–Surface Water Interface of a Tidal Channel

LeMonte

et al. 2022

Environ. Sci. Technol.

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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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