Chahkandi, B. et al. 2021. Behavior evaluation of freundlich and langmuir isotherms in cadmium preconcentration using solid phase extraction method for linear and nonlinear numerical computational patterns. Annals of Civil and Environmental Engineering. 5, 1 (Sep. 2021), 007–010. DOI:https://doi.org/10.29328/journal.acee.1001029.