Mechanism of arsenic enrichment and mobilization in groundwater from southeastern Bangladesh: Water quality and preliminary health risks assessment.

Autor: Rahman MA; Department of Geology and Mining, University of Rajshahi, Rajshahi 6205, Bangladesh., Siddique MAB; Institute of National Analytical Research and Service (INARS), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka 1205, Bangladesh. Electronic address: sagor.bcsir@gmail.com., Khan R; Institute of Nuclear Science and Technology, Bangladesh Atomic Energy Commission (BAEC), Savar, Dhaka, 1349, Bangladesh. Electronic address: rahatkhan.baec@gmail.com., Reza AHMS; Department of Geology and Mining, University of Rajshahi, Rajshahi 6205, Bangladesh., Khan AHAN; Institute of Nuclear Science and Technology, Bangladesh Atomic Energy Commission (BAEC), Savar, Dhaka, 1349, Bangladesh. Electronic address: nafiwre10@gmail.com., Akbor MA; Institute of National Analytical Research and Service (INARS), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka 1205, Bangladesh., Islam MS; Department of Soil Science, Patuakhali Science and Technology University, Patuakhali 8602, Bangladesh., Hasan AB; Department of Geology and Mining, University of Rajshahi, Rajshahi 6205, Bangladesh., Hasan MI; Department of Geology and Mining, University of Rajshahi, Rajshahi 6205, Bangladesh., Elius IB; Institute of Nuclear Science and Technology, Bangladesh Atomic Energy Commission (BAEC), Savar, Dhaka, 1349, Bangladesh.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2022 May; Vol. 294, pp. 133556. Date of Electronic Publication: 2022 Jan 07.
DOI: 10.1016/j.chemosphere.2022.133556
Abstrakt: To understand the mechanistic pathway of arsenic (As) enrichment and mobilization in groundwater (southeastern Bangladesh) and to evaluate the water quality as well as associated health risks, a suite of systematically collected groundwater samples (depth: 17-61 m) were analyzed. Arsenic concentrations (μg L -1 ) in the groundwater samples were ranged from 6 to 581 with a mean value of 199 which is significantly higher than the recommended values. The assessment of water quality using entropy water quality index and irrigation water quality indices revealed that the groundwater in the studied region was not recommended for drinking and irrigation, respectively with few exceptions. Dominant water types in the studied area were Ca-Mg-HCO 3, Na-HCO 3 , and Na-Cl types. Various forms of water-rock interactions, leaching of evaporates, and the confined nature of the aquifer mostly control the hydro-chemical parameters. Fe/Mn bound As are likely to be released in the aquifer through the dissolution of carbonate minerals of Fe/Mn while the higher degree of water-rock interaction and probable oxidation of organic materials helped to elevate As concentration. The probable longer residence time of groundwater guided by topographic slope and the neighboring clayey aquitard govern the As mobilization in the aquifer. Probabilistic health risk assessment revealed that groundwaters from the studied area can cause both non-carcinogenic and carcinogenic health risks.
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Databáze: MEDLINE
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