The contribution of PCR for characterization of groundwater in the region Ziban (South-eastern Algeria)

The region of el ghrous oriented to agricultural purpose, the irrigation in this area is made from water of the moi-pliocene aquifer and lower eocene. analysis of major elements and nitrates performed on these waters, shows higherconcentrations. as an example : na (> 400 mg / l), ca (> 723 mg / l), mg (> 310 mg / l), cl (> 850 mg / l), so4 (> 4000mg / l) and no3 (> 175 mg / l) for the sheet of miopliocène. as regards to lower eocene ,we find the followingconcentrations: na (> 400 mg / l), ca (> 700 mg / l), mg (> 250 mg / l), cl 1000 mg / l), so4 ( > 2000mg / l) and no3(<50 mg / l). to determine the apparent links between the chemical elements, we conducted a principal componentsanalysis. the observation of the pcr circle, bring out the mineralization of water caused primarily by chlorides andsulphates on the anions side and all cations (ca, mg, na and k) indicating a similar source. it is less influenced bybicarbonates. nitrates that are not correlated to any elements seem to have an anthropogenic origin.