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The A1 sample was considered a mixture (Table 6) of AZ2 (surface water, Zelegüa stream), AC1 (surface water, Cortaderas stream) and M83 (groundwater from unconfined aquifer). The results (Table 6) showed that to obtain the sodium bicarbonate water type of Ají stream in the A1 section (final solution), the initial solutions must be mixed in a ratio 19/72/9 (AZ2/AC1/M83) and cation exchange and salt dissolution processes (CaCO3;CaSO4:2H2O) must be produced.

Table 6

(a) Samples used in the numerical modeling and (b) results of numerical modeling carried out with PHREEQC

(a) SampleEC (μS/cm)pHCO3−2 (mg/L)CO3H (mg/L)SO4=(mg/L)Cl (mg/L)Na+ (mg/L)K+ (mg/L)Ca+ (mg/L)Mg+ (mg/L)δ18O (‰)δ2H (‰)
AZ2 (IS) 1,050 8.5 21.82 502.5 88.0 42.9 273.0 7.0 12.0 21.0 −5.1 −25.9 
AC1 (IS) 1,025 8.4 9.70 490.0 107.8 42.9 257.8 5.6 16.0 8.8 −5.1 −25.5 
M83 (IS) 1,650 8.2 0.00 800.0 88.0 65.7 385.2 11.4 24.8 26.3 −4.5 −25.1 
A1 (FS) 1,212 8.9 26.7 535.0 123.4 51.4 282.1 9.2 20.0 12.7 −4.9 −24.7 
(b)
SampleMixture fractionNaX (mol/L)CaX2 (mol/L)KX (mol/L)CaCO3 (mol/L)CaSO4:2H2O (mol/L)
AZ2 (IS) 0.190 0.20 −0.10 0.02 0.09 0.03             
AC1 (IS) 0.720 0.78 −0.41 0.05 0.35 0.04             
M83 (IS) 0.090 0.10 −0.05 0.006 0.04 0.02             
(a) SampleEC (μS/cm)pHCO3−2 (mg/L)CO3H (mg/L)SO4=(mg/L)Cl (mg/L)Na+ (mg/L)K+ (mg/L)Ca+ (mg/L)Mg+ (mg/L)δ18O (‰)δ2H (‰)
AZ2 (IS) 1,050 8.5 21.82 502.5 88.0 42.9 273.0 7.0 12.0 21.0 −5.1 −25.9 
AC1 (IS) 1,025 8.4 9.70 490.0 107.8 42.9 257.8 5.6 16.0 8.8 −5.1 −25.5 
M83 (IS) 1,650 8.2 0.00 800.0 88.0 65.7 385.2 11.4 24.8 26.3 −4.5 −25.1 
A1 (FS) 1,212 8.9 26.7 535.0 123.4 51.4 282.1 9.2 20.0 12.7 −4.9 −24.7 
(b)
SampleMixture fractionNaX (mol/L)CaX2 (mol/L)KX (mol/L)CaCO3 (mol/L)CaSO4:2H2O (mol/L)
AZ2 (IS) 0.190 0.20 −0.10 0.02 0.09 0.03             
AC1 (IS) 0.720 0.78 −0.41 0.05 0.35 0.04             
M83 (IS) 0.090 0.10 −0.05 0.006 0.04 0.02             

IS: initial solution; FS: final solution.

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