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High arsenic concentration in groundwater related to sedimentary facies in the Mekong River delta, Vietnam
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|Authors:||Ta Thi Kim Oanh; Nguyen Van Lap|
|Author Affiliations:||Primary: |
Vietnam Academy of Science and Technology, Institute of Resources Geography, Vietnam
|Volume Title:||Khoa hoc ve Trai dat (Vien Han Khoa hoc va Cong nghe Viet Nam Vietnam Journal of Earth Sciences|
|Source:||Khoa hoc ve Trai dat (Vien Han Khoa hoc va Cong nghe Viet Nam = Vietnam Journal of Earth Sciences, 38(2), p.178-187. Publisher: Vien Han Lam Khoa hoc va Cong nghe Viet Nam, Hanoi, Vietnam. ISSN: 0866-7187|
|Note:||In English. 11 refs.; illus., incl. geol. sketch maps|
|Summary:||Arsenic (As) contamination in groundwater has been recognized in the Mekong River Delta (MRD) since 2001, especially in Dong Thap and An Giang provinces. The investigations were carried out during 2008-2009 and from 2012 to present. The investigations of As distribution in groundwater and sediments were based upon the field, and laboratory analyses using field kit (Hironaka, 1998) and AOAC laboratory - Vietnamese standard 6626-2000 (Vilas). Results show that the As concentrations ranging from 15 to 1,650 µg/l is found in 520 private tubewells at depth between 15 and 90 m, while being rare or very low at depth between 200 and 300 m. High As content is usually found in 15-70m tubewells in which approximately 70 - 80% of tubewells having arsenic levels of >500µg/l are located at some areas in Dong Thap and An Giang provinces in the upper MRD plain. Bore core drilling records show a probable relationship between As concentration in groundwater and sedimentary facies in the MRD. The highest As content is found along the Mekong River valleys in the Late Pleistocene and Holocene aquifers.|
|Subjects:||Arsenic; Cenozoic; Deltaic environment; Ground water; Heavy metals; Hydrochemistry; Hydrology; Metals; Pleistocene; Pollutants; Pollution; Public health; Quaternary; Rivers and streams; Sampling; Sediment yield; Upper Pleistocene; Water quality; An Giang Vietnam; Bassac River; Dong Thap Vietnam; Mekong River delta|
|Coordinates:||N104000 N104000 E1054000 E1054000|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute.|
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