**3.3. Results obtained by using a new approach for determination of equilibrium adsorption capacity of SBIX toward NOM**

Obtained experimental results were applied in the equations 25-32 to calculate the important kinetic behavior of SBIX toward NOM. Calculated ADC values were decreased exponentially during the experiment as shown at Figure 11(A). Curve of exponential regression kinetically represents interface of passed (under the curve) and adsorbed (above the curve) quantity of NOM per mass unit of SBIX in time. The empirical coefficients β and δ (equation 29) were calculated at the base of equation 30, i.e. empirical linear equation (Figure 11(B)). Coefficients β and δ were calculated from linear equation (Figure 11(B)) lnA(DC) = −0.704 C + 1.471 and amounts 4.355 Lg-1h-1 and 0.70, respectively.

Empirical equation form of the obtained curve and regression coefficient were ADC = 4.355 e-0.70C and 0.961, respectively. By utilization of equations 31 and 32, respectively, the total specific adsorption capacity and adsorption capacity of the resin at pseudo equilibrium were calculated. The values of ADCa and Qpe were 14.41 mg/gh and 10.935,31 mg/g, respectively.

**Figure 11.** (A) Changes of specific adsorption capacity of SBIX to NOM during the experiment and (B) Linear form of exponential curve ADC vs. C for calculation of β and δ
