Locations of sediment sampling sites along the Meghna River are indicated by circles with dots in the center White light gray and dark gray circles represent HCl leachable As concentrations in subsurface sediments at a depth between 1 and 3 m with values of <10 mg/kg between 100 and 1 000 mg/kg and between 1 000 and 23 000 mg/kg respectively
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