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Arsenic in groundwater and sediment in the Mekong River delta, Vietnam |
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| Authors: | Thi Hanh Hoang Kyoung-Woong Kim My Hoa Nguyen |
| Institution: | a Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Republic of Korea b International Environment Research Center (IERC), Gwangju Institute of Science and Technology (GIST), Republic of Korea c Soil Science & Land Management Department, College of Agriculture, Cantho University, Viet Nam |
| Abstract: | A study of groundwater and sediment during 2007-2008 in the Mekong River delta in Vietnam (MDVN) revealed that 26%, 74%, and 50% of groundwater samples were above the US EPA drinking water guidelines for As (10 μg/L), Mn (0.05 mg/L), and Fe (0.3 mg/L). The range of As, Fe, and Mn concentrations in the MDVN were <0.1-1351 μg/L, <0.01-38 mg/L, and <0.01−14 mg/L, respectively. Elevated levels of As were found in groundwater at sampling sites close to the Mekong River and in wells less than 60−70 m deep. An inverse relationship was found between As and Mn concentrations in groundwater. Sediment samples from An Giang and Dong Thap had the highest As concentrations (18 mg/kg and 38 mg/kg, respectively). Arsenic sediment occurred mainly in the poorly crystalline Fe oxide phases. Reductive dissolution of the Fe oxide phase is not necessarily the dominant mechanism of As release to groundwater. |
| Keywords: | Arsenic Iron Manganese Groundwater Core sample Mekong river delta Vietnam |
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