Figure 5
Distribution of dissolved As in groundwater (0–50 μg L-1 in green; 50–200 μg L-1 in red; and >200 μg L-1 in black) from shallow tubewells shown on enlarged and rotated portions of the IKONOS images in Figure 2 for (a) Chakdaha, India and (b) Balia Para, Bangladesh. Also shown are contoured sections based on needle-sampler profiles for dissolved As (c-d), Fe (e-f), SO4 (g-h), and acid-leachable Fe(II)/Fe in the aquifer particles. Sections drawn with Ocean Data View [47].