Anthropogenic dominance on geogenic arsenic problem of the groundwater in the Ganga-Brahmaputra floodplain: a paradox of origin and mobilization

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dc.contributor.author Kumar, Manish
dc.contributor.author Patel, Arbind Kumar
dc.contributor.author Singh, Ashwin
dc.coverage.spatial United Kingdom
dc.date.accessioned 2021-11-24T13:31:13Z
dc.date.available 2021-11-24T13:31:13Z
dc.date.issued 2021-11
dc.identifier.citation Kumar, Manish; Patel, Arbind Kumar and Singh, Ashwin, "Anthropogenic dominance on geogenic arsenic problem of the groundwater in the Ganga-Brahmaputra floodplain: a paradox of origin and mobilization", Science of The Total Environment, DOI: 10.1016/j.scitotenv.2021.151461, Nov. 2021 en_US
dc.identifier.issn 0048-9697
dc.identifier.uri http://dx.doi.org/10.1016/j.scitotenv.2021.151461
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/7284
dc.description.abstract The Ganga-Brahmaputra floodplains constitute a complex system that is vulnerable to arsenic recycling owing to its geomorphic sensitivity, aquifer profiles, high meandering scars and extreme sediment deposition, along with extreme monsoonal disturbances; and are subjected to significant alterations in arsenic recycling. We have put an effort to delineate the similarities and dissimilarities pertaining to the arsenic prevalence, origin and mobilization in the two hotspots, namely the Mid-Gangetic Floodplains (MGFP) and the Brahmaputra Floodplains (BFP). Pertaining to this, we collected 384 representative water samples for hydrogeochemical investigations, multivariate analyses, and saturation status based predictive modelling, with BFP having a maximum concentration of arsenic (As) reaching to almost 97.9 μgL−1 and MGFP having a maximum concentration of 50.1 μgL−1. Seasonality impelled changes and conforming riverine recharges are leading major ionic differentiations in both the floodplains across seasons. Meandering and aquifer dynamics control As prevalence in the MGFP and BFP, respectively. Non-interdependent HCO3− recharge mediated As-recycling was found in the BFP. Carbonate weathering is dominant in the MGFP, while both carbonate and silicate weathering take precedence in the BFP. Multivariate analysis hints at fertilizer influence on As mobilization in the MGFP. Reductive hydrolysis of Fe-OOH mediated As-release is more prominent in the BFP. Seasonal arsenic fluctuations are going to have more climatic dependency in near future owing to the increasing erratic rains, pumping and recharge events. Erratic precipitation will provoke immediate response in both floodplains in terms of As mobilization which urgently needs attention to counter increasing arsenic vulnerability.
dc.description.statementofresponsibility by Manish Kumar, Arbind Kumar Patel and Ashwin Singh
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.subject Ganga-Brahmaputra floodplains en_US
dc.subject Arsenic en_US
dc.subject Hydrochemistry en_US
dc.subject Predictive modelling en_US
dc.title Anthropogenic dominance on geogenic arsenic problem of the groundwater in the Ganga-Brahmaputra floodplain: a paradox of origin and mobilization en_US
dc.type Article en_US
dc.relation.journal Science of The Total Environment


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