High arsenic (As) concentrations (12-97 μg/l) have been detected in the groundwater of the Barak Valley region (Assam), northeastern India. The main source of As is traced to the litho-facies of the Tipam formation.
Dr. Thambidurai P., Chandrashekhar, A. K., and Chandrasekharam, D., “Geochemical Signature of Arsenic-Contaminated Groundwater in Barak Valley (Assam) and Surrounding Areas, Northeastern India”, Procedia Earth and Planetary Science, vol. 7, pp. 834 - 837, 2013.