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The geochemistry of groundwaters from the Meghna River Delta of Bangladesh was studied to determine the distribution of arsenic, and to evaluate the potential mobility of As from the host sediments to the groundwater. Groundwaters from tube wells are characterized by pH of 6.5 to 7.5, oxidation reduction potential (ORP) of +52 to −2 mV, Ca contents of 7 to 25 mg/l, and Fe contents of 0.01 to 22.2 mg/l...