Humic Substances Modelling Tool

Titration Data

Format: Six columns (Acid conc. [mol/L], Acid vol. [mL], Total vol. [mL], Equilibrium pH, Humic conc. [g/L], Ionic strength [mol/L])

Fitting Algorithm

Avoid Singular Values (Regularization)

Qmax,1:-- mol/kglog K̃1:--p1:--

Qmax,2:-- mol/kglog K̃2:--p2:--

b:--

RMSE:--R²:--

Isotherm Data

Format: Four columns (log[Metal]free, log[Metal]bound, Humic conc. [g/L], Ionic strength [mol/L])

Ion Type

Cation

Anion

Use acid-base parameters

Parameter Constraints (Min-Max Range)

Fix log K1

Fix log K2

Fix n1

Fix n2

Fitting Algorithm

Log K1:--Log K2:--

n1:--n2:--

CF:--

RMSE:--R²:--

NICA-Donnan Modelling Tool