On the spatial variation of arsenic in groundwater of the Red River floodplain, Vietnam

Author(s):  
D Postma ◽  
F Larsen ◽  
R Jakobsen ◽  
H Sø ◽  
J Kazmierczak ◽  
...  
2007 ◽  
Vol 71 (21) ◽  
pp. 5054-5071 ◽  
Author(s):  
Dieke Postma ◽  
Flemming Larsen ◽  
Nguyen Thi Minh Hue ◽  
Mai Thanh Duc ◽  
Pham Hung Viet ◽  
...  

Author(s):  
Jeffery S. Girard

A pit feature containing Tchefuncte-like pottery, a Gary point, and fauna) remains recently was investigated at the Swan Lake Site (168011) located near Willow Chute Bayou in the Red River floodplain of eastern Bossier Parish. Three charcoal samples from the pit yielded radiocarbon ages of 2020 + /-60 B. P., 1830+/-70 B.P., and 1690+/-80 B.P. making this the earliest well-dated context in northwestern Louisiana containing ceramics. The most conspicuous feature at the site is a mound, now approximately 2.5 m high and about 25 min diameter. Clarence Webb first recorded the site, but only made a short description: "Solitary mound on n-east shore of Swan Lake, which is an old Red River channel. Is circular in shape, approx. 8-10 ft. high, 60 ft. at the base and 20 ft. on summit. Has several shallow trial holes on top, appears to be built up of sand -- no sherds found on or around mound -- trial holes show mostly sandy soil near clay out in field. In one or two places 3 to 4 inches dark soil found. In nearby field, 1 rough spear head found." Since Webb's initial visit the landowners have collected numerous artifacts from the site surface. Most of the decorated pottery consists of Early to Middle Caddoan Period types suggesting that the mound is related to those at the nearby Vanceville (16807) and Werner (16808) sites. However, also present are a large number of Gary points and several sherds similar to those recovered from the Bellevue Site (16BO4) indicating that an earlier occupation is represented as well.


2020 ◽  
Vol 42 (2) ◽  
pp. 161-175
Author(s):  
Dang Tran Trung ◽  
Nguyen Thi Nhan ◽  
Than Van Don ◽  
Nguyen Kim Hung ◽  
Jolanta Kazmierczak ◽  
...  

In the Red River Delta, the concentrations of Arsenic in groundwater of alluvial dominated systems are very high, exceeding the WHO’s permissible. The correlation between the Arsenic concentrations in groundwater and the age of Holocene sediment as a key controlling groundwater Arsenic concentration in the Red River delta has been investigated. The evolution of sediments in the Holocene is closely related to paleo-riverbed migration in the past. A combination of methods is implemented including remote sensing, multi-electrode profiling (MEP), gamma-logging, drilling, soil sample and groundwater modeling. The resul has identified the shape, sediment compositions and location of the six paleo-riverbed periods. The age of the paleo-riverbed is determined by drilling, soil sampling and optically stimulated luminescence (OSL) in the laboratory. The oldest sediments is 5.9±0.4 ka BP in Phung Thuong near the mountain, the youngest one is from 0.4÷0.6 ka BP in H-transect near the Red River and the rest of the other is around 3.5 ka BP. The modeling results by using MODFLOW and MT3D show that the dynamics of paleo-riverbeds controlling Arsenic mobilization in groundwater in the Red River Delta. When the river moved to another position, the current river position at that time was filled with younger sediments and became paleo-riverbed formation with reducing conditions, Arsenic content which was adsorbed in the previous stage then released into groundwater. Therefore, Arsenic concentration in groundwater of young Holocene sediments is higher than in older ones which elucidates that paleo-riverbed migration controls on Arsenic mobilization in groundwater in the study area.


2010 ◽  
Vol 74 (12) ◽  
pp. 3367-3381 ◽  
Author(s):  
Dieke Postma ◽  
Søren Jessen ◽  
Nguyen Thi Minh Hue ◽  
Mai Thanh Duc ◽  
Christian Bender Koch ◽  
...  

2015 ◽  
Vol 4 ◽  
pp. 154-171 ◽  
Author(s):  
Chandan Mahanta ◽  
Gustav Enmark ◽  
Daniel Nordborg ◽  
Ondra Sracek ◽  
Bibhash Nath ◽  
...  

2014 ◽  
Vol 142 ◽  
pp. 587-600 ◽  
Author(s):  
Nguyen Thi Hoa Mai ◽  
Dieke Postma ◽  
Pham Thi Kim Trang ◽  
Søren Jessen ◽  
Pham Hung Viet ◽  
...  

2018 ◽  
Vol 52 (3) ◽  
pp. 219-228 ◽  
Author(s):  
Keisuke KATSURA ◽  
Takenori WATANABE ◽  
Naoki MORITSUKA ◽  
Yasuhiro TSUJIMOTO ◽  
Baba INUSAH ◽  
...  

2019 ◽  
Vol 38 (1) ◽  
pp. 213-228 ◽  
Author(s):  
Caroline C. Arantes ◽  
Kirk O. Winemiller ◽  
Miguel Petrere ◽  
Carlos E. C. Freitas

2016 ◽  
Vol 195 ◽  
pp. 277-292 ◽  
Author(s):  
Dieke Postma ◽  
Thi Kim Trang Pham ◽  
Helle Ugilt Sø ◽  
Van Hoan Hoang ◽  
Mai Lan Vi ◽  
...  

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