Ionic Composition Thermodynamics for Different Saline Waters in Central Iraq

Abstract

understand the thermodynamic of ionic composition for different saline water, triplicate water samples were collected from each location. This study required chemical analysis for total cations (Ca+2,Mg+2,Na+1,K+1) and anions (Cl-1, HCO3-1,CO3-2,SO4-2). The following parameters were calculated using the[1] program: ionic strength, activity coefficient, activity, and ion pairs. The findings revealed that, according to the classification of medium salinity[2], There is no issue with the rate of infiltration. The calcium ionic activity coefficient values ranged from 0.332 to 0.587, with active Ca+2 accounting for 23 to 48 percent of total soluble Ca+2 in the samples investigated. The concentrations of ion pairs ranged from 0.749 to 2.716 mM. L-1. The magnesium ionic activity coefficient ranged from 0.385 to 0.609, and active Mg+2 was found to be between 29 and 44 percent of total soluble Mg+2. The concentrations of ion pairs ranged from 0.270 to 6.618 mM.L-1. In general, the findings show that: The following is the ion Paris sequence: (MgSO4) 0, (CaSO4) 0, (NaSO4) -, (MgHCO3) +, (CaHO3) +, (KSO4)-. The free ions were arranged in the following order: Na+, SO4 -2, Mg+2, Ca+2, HCO3-1, K+1.- Changes in the mathematical relationship between ionic strength and electric conductivity were generated by the correction of ion pairs and ionic activity.- Correction of ion pairs and ionic activity increased the adjusted sodium adsorption ratio (adj.RNa). Ion pairs, activity, and saline water are some of the terms used in this paper.