A. Horneman, Alexander van Geen, Dennis V. Kent, Pierre-Étienne Mathé et al.
Alexander van Geen, Habibul Ahsan, A. Horneman, Ratan Dhar et al.
OBJECTIVE: To survey tube wells and households in Araihazar upazila, Bangladesh, to set the stage for a long-term epidemiological study of the consequences of chronic arsenic exposure. METHODS: Water samples and household data were collected over a period of 4 months in 2000 from 4997 contiguous tub...
M. Stute, Yan Zheng, Peter Schlösser, A. Horneman et al.
The elevated arsenic (As) content of groundwater from wells across Bangladesh and several other South Asian countries is estimated to slowly poison at least 100 million people. The heterogeneous distribution of dissolved arsenic in the subsurface complicates understanding of its release from the sed...
Alexander van Geen, Yan Zheng, S. L. Goodbred, A. Horneman et al.
Whereas serious health consequences of widespread consumption of groundwater elevated in As have been documented in several South Asian countries, the mechanisms responsible for As mobilization in reducing aquifers remain poorly understood. We document here a previously unrecognized and consistent r...
Alexander van Geen, Zhongqi Cheng, Ashraf Ali Seddique, M. A. Hoque et al.
A comparison of field and laboratory measurements of arsenic in groundwater of Araihazar, Bangladesh, indicates that the most widely used field kit correctly determined the status of 88% of 799 wells relative to the local standard of 50 microg/L As. Additional tests showthatthe inconsistencies, main...
Zhongqi Cheng, Alexander van Geen, Ashraf Ali Seddique, Kazi Matin Ahmed
Millions of people in Bangladesh have probably switched their water consumption to wells that meet the local standard for As in drinking water of 50 microg/L as a result of blanket field testing throughout the country. It is therefore important to know if As concentrations in those wells could chang...
Ashraf Ali Seddique, Harue Masuda, Muneki Mitamura, Keiji Shinoda et al.
Alexander van Geen, Yan Zheng, Zhongqi Cheng, Yi He et al.
Soil and soil-water As profiles were obtained from 4 rice paddies in Bangladesh during the wet growing season (May-November), when surface water with little arsenic is used for irrigation, or during the dry season (January-May), when groundwater elevated in arsenic is used instead. In the upper 5 cm...
Alexander van Geen, Zhongqi Cheng, Jia Qing, Ashraf Ali Seddique et al.
In order to reduce the exposure to As naturally occurring in shallow groundwater of the Bengal Basin, tens of thousands of tubewells tapping deeper aquifers of the Bengal Basin have been installed. We address here lingering concerns that As concentrations in deep tubewells might increase over time w...
Alexander van Geen, Yan Zheng, Zhongqi Cheng, Z. Aziz et al.
Alexander van Geen, Kazi Matin Ahmed, Ashraf Ali Seddique, Mohammad Shamsudduha
OBJECTIVE: To monitor the effectiveness of deep community wells in reducing exposure to elevated levels of arsenic in groundwater pumped from shallower aquifers. METHODS: Six community wells ranging in depth from 60 m to 140 m were installed in villages where very few of the wells already present pr...
Alisa Opar, Alex Pfaff, Ashraf Ali Seddique, Kazi Matin Ahmed et al.
This study documents the response of 6500 rural households in a 25 km(2) area of Bangladesh to interventions intended to reduce their exposure to arsenic contained in well water. The interventions included public education, posting test results for arsenic on the wells, and installing 50 community w...
Md Hafijur Rahaman Khan, Jianguo Liu, Shengfa Liu, Ashraf Ali Seddique et al.
Clay minerals are significant indicators that can be used to identify sources and transport patterns of both fluvial and marine sediments. The Ganges, Brahmaputra, and Surma-Meghna (SM) rivers are the most important rivers of the Bengal Basin (BB), loading a large amount of sediments from the Himala...
Alexander van Geen, T. Protus, Zhongqi Cheng, A. Horneman et al.
Profiles of groundwater and sediment properties were collected at three sites in Bangladesh with an inexpensive sampling device that is deployed by modifying the local manual drilling method. Dissolved As concentrations in the groundwater samples ranging from 5 to 600 microg/L between 5 and 50 m dep...
Zhongqi Cheng, Alexander van Geen, Chuanyong Jing, Xiaoguang Meng et al.
A simple arsenic removal system was used in Bangladesh by six households for 4 months to treat well water containing 190-750 microg/L As as well as 0.4-20 mg/L Fe and 0.2-1.9 mg/L P. The system removes As from a 16-L batch of water in a bucket by filtration through a sand bed following the addition ...