Mechanisms of arsenic contamination associated with hydrochemical characteristics in coastal alluvial aquifers using mul
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ORIGINAL PAPER
Mechanisms of arsenic contamination associated with hydrochemical characteristics in coastal alluvial aquifers using multivariate statistical technique and hydrogeochemical modeling: a case study in Rayong province, eastern Thailand Satika Boonkaewwan . Prinpida Sonthiphand . Srilert Chotpantarat Received: 23 September 2019 / Accepted: 17 September 2020 Ó Springer Nature B.V. 2020
Abstract The rapid development of Rayong Province has resulted in increased demands on groundwater usage. This has potentially induced the release of contaminants such as arsenic (As), among others (i.e., NO3-, PO43-) from various land use types—especially in intensive agricultural areas and heavy industrial areas, including landfill sites. The objectives of this research are to investigate the As speciation and groundwater chemistry occurring due to different hydrogeological settings and the influence of human activities and to explain the mechanism of As release in the coastal alluvial aquifers in Rayong Province using multivariate statistical techniques and hydrogeochemical modeling (PHREEQC). Six major water facies, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10653-020-00728-7) contains supplementary material, which is available to authorized users. S. Boonkaewwan International Postgraduate Programs in Environmental Management, Graduate School, Chulalongkorn University, Bangkok 10330, Thailand
mainly consisting of Ca–Na–HCO3–Cl and Ca–Na–Cl, were included in the hydrochemical analysis. Arsenic levels were inversely correlated with NO3-, SO42-, DO, and ORP, confirming the reducing environment in the groundwater system. The results from the PHREEQC model show that most wells were strongly under-supersaturated with respect to arsenorite, scorodite, and arsenic pentoxide. Arsenic (As) is probably derived from the dissolution of Fe oxide and hydroxide (i.e., Fe(OH)3, goethite, maghemite, and magnetite). The multivariate statistical techniques revealed that the As species mainly consisted of As(III), governed by the reducing environment, while As(V) may be desorbed from Fe oxide and hydroxide as the pH increases. Anthropogenic inputs and intensive pumping may enhance the reducing environment, facilitating the release of As(III) into the groundwater. The knowledge P. Sonthiphand Department of Biology, Faculty of Science, Mahidol University, 272 Rama VI Road Rachadhavi, Bangkok 10400, Thailand
S. Boonkaewwan S. Chotpantarat (&) Center of Excellence On Hazardous Substance Management (HSM), Chulalongkorn University, Bangkok 10330, Thailand e-mail: [email protected]
S. Chotpantarat Research Program On Controls of Hazardous Contaminants in Raw Water Resources for Water Scarcity Resilience, Center of Excellence On Hazardous Substance Management (HSM), Chulalongkorn University, Bangkok, Thailand
S. Boonkaewwan S. Chotpantarat Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
S. Chotp
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