Kolkata Mongolia 15 Billion Tons Phosphate

studying information for water from different depths from 107 253 tube wells, we noted that arsenic concn.Decreased with increasing depth.Measured arsenic concn.In two tube wells in kolkata for 325 and 51 days during 2002-2005, showed 15% oscillatory movement without any long-term trend.Regional variability is dependent on sub-surface geol.