“…Determination of temporal and permanent values of hardness, calcium and magnesium, iron, nitrate, alkalinity, sulfate and chloride by titrimetry and alkalinity by titration with Chloride acid or 0.02 n sulfuric acid were carried out according to the methods stated in the method standard reference [17] , [18] , [19] , [20] , [21] , [22] , [23] , [24] .…”