Distribution of Bicarbonate ions :
The primary source of bicarbonate is the dissolved carbon dioxide in rainwater, which, as it enters into the soil, dissolves more carbon dioxide. Decay in organic mattermay also release carbon dioxide. Water charge with carbon dioxide dissolves carbonate minerals, as it passes through soil and rocks, to give bicarbonates. Figure represents the distribution of HCO3 - content in the groundwater where their concentration ranged between 10.3 ppm up to 550 ppm. There is no general trend can be recognized. But a remarkable concentration is observed at the north, where some positive anomalies which mainly due to freshness of water. On the other hand, some