Aquifer Arsenic Cycling Induced by Seasonal Hydrologic Changes within the Yangtze River Basin

Environmental Science & Technology
Michael V SchaeferScott Fendorf

Abstract

Consumption of groundwater containing >10 μg L(-1) arsenic (As) adversely impacts more than 100 million people worldwide. Multiyear trends in aquifer As concentrations have been documented, but strong seasonal variations are not commonly observed. Here we report dramatic seasonal changes in As concentrations and aquifer chemistry within the Jianghan Plain of the Yangtze River, China. At some wells, concentrations fluctuate by more than an order of magnitude within a single year (100-1200 μg L(-1)). Groundwater extraction and sustained water levels of surface channels during the dry season induces a strong downward hydraulic gradient, seasonally supplying oxidizing (oxygen, nitrate) water to the otherwise anoxic aquifer. Oxygen and/or nitrate addition promotes a transient drop in As concentrations for 1-3 months. When recharge ceases, reducing, low-arsenic conditions are reestablished by reactive, endogenous organic carbon. Temporal variability in As concentrations is especially problematic because it increases the probability of false-negative well testing during low-arsenic seasons. However, periods of low As may also provide a source of less toxic water for irrigation or other uses. Our results highlight the vulnerability and...Continue Reading

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Citations

Apr 16, 2016·Environmental Science & Technology·Ruirui ZhaoSonghu Yuan
Dec 21, 2016·Environmental Science & Technology·Shiwei XieYanxin Wang
Apr 25, 2019·Environmental Health and Preventive Medicine·Hitoshi MochizukiYoshiki Kuroda
Apr 10, 2020·International Journal of Environmental Research and Public Health·Laura A RichardsDavid A Polya
Dec 25, 2017·Environmental Monitoring and Assessment·Eirini ZkeriPetros Gaganis
Jun 3, 2020·Ground Water·Brian J MaillouxAlexander van Geen
Dec 31, 2018·Journal of Hazardous Materials·Tianliang ZhengTeng Ma
Jun 12, 2020·The Science of the Total Environment·Yanqiu TaoYanxin Wang
May 28, 2021·Environmental Science & Technology·Sabina RakhimbekovaClare E Robinson
Aug 14, 2021·Journal of Contaminant Hydrology·Xue PingMenggui Jin
Nov 11, 2020·Environmental Science & Technology·Yanhua DuanChongxuan Liu
Aug 14, 2020·Environmental Science & Technology·Michael V SchaeferSamantha C Ying

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