Capillarity as a hydrologic control in the unsaturated zone drives arsenic transport from groundwater to soil solid phase in Matehuala (Mexico)

Andrea Gómez-Hernández, J . L. Hernández-Martínez, Diana Meza-Figueroa, Nadia Martínez-Villegas, Bhaskar Sen Gupta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

Recent studies showed an arsenic concentration decrease from 91.5 to 11.3 mg/L in Matehuala (Mexico) groundwater, a semi-arid environment where calcite and gypsum predominate. Arsenic retention has been widely studied and explained in iron-rich systems, however, little is known about hydrological controls over arsenic attenuation in semi-arid soils rich in calcite and gypsum. In this study, mineralogy, water-rock interaction modeling soil fractionation have been used to explain arsenic transport from groundwater to soil solid phase and arsenic distribution in a low iron oxides content soil. In the alluvial-evaporitic geologic setting of the study area, arsenic wa distributed mainly in soluble fraction and adsorbed in iron oxy-hydroxides and bonded to no-crystalline pyrite Capillarity plays a key role in soluble arsenic retention from groundwater to soil solid phase, which under reducing conditions typical of aquifer systems, would spread due to As(III) high mobility.
Original languageEnglish
Title of host publicationArsenic in the Environment: Bridging Science to Practice for Sustainable Development
Subtitle of host publicationAs2021
PublisherCRC Press
Pages44-46
Number of pages3
Edition1st
ISBN (Electronic)9781003317395
ISBN (Print)9781032329284
DOIs
Publication statusPublished - 2023
Event8th International Congress and Exhibition on Arsenic in the Environment 2021 - Wageningen, Netherlands
Duration: 7 Jun 20219 Jun 2021

Conference

Conference8th International Congress and Exhibition on Arsenic in the Environment 2021
Abbreviated titleAs2021
Country/TerritoryNetherlands
CityWageningen
Period7/06/219/06/21

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