Bayesian Modeling Approach for Characterizing Groundwater Arsenic Contamination in the Mekong River Basin
- Authors
- Cha, YoonKyung; Kim, Young Mo; Choi, Jae-Woo; Sthiannopkao, Suthipong; Cho, Kyung Hwa
- Issue Date
- Jan-2016
- Publisher
- Elsevier
- Keywords
- Arsenic (As) contamination; Bayesian change-point model; Drinking water source; Groundwater; Linear model; Mekong River basin
- Citation
- Chemosphere, v.143, no.SI, pp.50 - 56
- Indexed
- SCIE
SCOPUS
- Journal Title
- Chemosphere
- Volume
- 143
- Number
- SI
- Start Page
- 50
- End Page
- 56
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/24052
- DOI
- 10.1016/j.chemosphere.2015.02.045
- ISSN
- 0045-6535
- Abstract
- In the Mekong River basin, groundwater from tube-wells is a major drinking water source. However, arsenic (As) contamination in groundwater resources has become a critical issue in the watershed. In this study, As species such as total As (As-TOT), As(III), and As(V), were monitored across the watershed to investigate their characteristics and inter-relationships with water quality parameters, including pH and redox potential (Eh). The data illustrated a dramatic change in the relationship between As-TOT and Eh over a specific Eh range, suggesting the importance of Eh in predicting As-TOT. Thus, a Bayesian change-point model was developed to predict As-TOT concentrations based on Eh and pH, to determine changes in the As-TOT-Eh relationship. The model captured the Eh change-point (similar to-100 +/- 15 mV ), which was compatible with the data. Importantly, the inclusion of this change-point in the model resulted in improved model fit and prediction accuracy; As-TOT concentrations were strongly negatively related to Eh values higher than the change-point. The process underlying this relationship was subsequently posited to be the reductive dissolution of mineral oxides and As release. Overall, As-TOT showed a weak positive relationship with Eh at a lower range, similar to those commonly observed in the Mekong River basin delta. It is expected that these results would serve as a guide for establishing public health strategies in the Mekong River Basin
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