C.A.J. Appelo, M. J. J. Van Der Weiden, Christophe Tournassat, Laurent Charlet
Surface complexation models are commonly used to predict the mobility of trace metals in aquifers. For arsenic in groundwater, surface complexation models cannot be used because the database is incomplete. Both carbonate and ferrous iron are often present at a high concentration in groundwater and w...
Stéphane Guillot, Laurent Charlet
Holocene groundwater in many districts of the West Bengal and parts of Bangladesh are enriched in arsenic enhancing poisoning effect on humans. One of the main problems to depict the source of arsenic is that this element is very mobile and can be easily removed and recombined from the source during...
Jerome Métral, Laurent Charlet, Sara Bureau, Sukumar Basu Mallik et al.
BACKGROUND: The origin of the spatial variability of dissolved As concentrations in shallow aquifers of the Bengal Basin remains poorly understood. To address this, we compare here transects of simultaneously-collected groundwater and aquifer solids perpendicular to the banks of the Hooghly River in...
Alexander van Geen, K. A. Radloff, Z. Aziz, Zhongqi Cheng et al.
One of the reasons the processes resulting in As release to groundwater in southern Asia remain poorly understood is the high degree of spatial variability of physical and chemical properties in shallow aquifers. In an attempt to overcome this difficulty, a simple device that collects groundwater an...
Laurent Charlet, Guillaume Morin, Jérôme Rose, Yuheng Wang et al.
Massive deleterious impacts to human health are resulting from the use of arsenic-bearing groundwaters in South-East Asia deltas and elsewhere in the world for drinking, cooking and/or irrigation. In Bangladesh alone, a fifth of all deaths are linked to arsenicosis. In the natural and engineered sub...
Maxence Paul, Laurie Reisberg, Nathalie Vigier, Yan Zheng et al.
Mariëtte Wolthers, Laurent Charlet, C.H. van der Weijden
Arsenate, As (V), sorption onto synthetic disordered mackinawite (FeSam) follows Langmuir-type \nbehaviour. As (V) is not reduced prior to or during sorption. Arsenite, As (III) sorption can be expressed by a \nFreundlich isotherm. Comparison of the experimental sorption isotherms to field d...
Laurent Charlet
Alluvial sands in the delta and flood plains of Ganga-Bahmaputra-Meghna river systems are usually rich in mica (5-30% of suspended sediment) and biotite constitutes about 65-75% of the total mica. It is transported to the alluvium by the river system from source terrain, and therefore weathering of ...