کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4425161 | 1309095 | 2010 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Arsenic in groundwater and sediment in the Mekong River delta, Vietnam Arsenic in groundwater and sediment in the Mekong River delta, Vietnam](/preview/png/4425161.png)
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.
Journal: Environmental Pollution - Volume 158, Issue 8, August 2010, Pages 2648–2658