Freundlich_D {soilchemistry}

Freundlich isotherm for desorption data in soil

Description

This function fits Freundlich adsorption isotherm to data pertaining to desorption of an adsorbed nutrient, e.g., phosphorus (as phosphate), sulphur (as sulphate), micronutrient cations or anions, silicon (as silicate), etc. in soil.

Usage

Freundlich_D(W = W, V = V, Ci = Ci, Cf = Cf, Cf_Des = Cf_Des, Vres= Vres,
Vfinal = Vfinal, onebyn_ads = onebyn_ads, ...)

Arguments

W

Mass of soil sample (g)

V

Volume of extractant solution (mL)

Ci

Initial concentration (mg/L) of the added element, e.g., phosphorus

Cf

Final or equilibrium concentration (mg/L) after adsorption of the same element

Cf_Des

Final or equilibrium concentration (mg/L) after each desorption step of the same element

Vres

Volume of carried over solution from previous adsorption or desorption step (mL)

Vfinal

Final volume of the solution for each desorption step (mL)

onebyn_ads

Values of ‘1/n’ obtained from Freundlich_A

...

Any other argument that can be passed to base plot

Value

a - empirical constant (unitless) 1/n - empirical constant (unitless)

References

Barman, M., Datta, S.P., Rattan, R.K., Meena, M.C., 2013. Sorption and desorption of nickel in soils in relation to its availability to plants. Agrochimica LVII (3), 235–249.

Examples

with(data = df_sordes, Freundlich_D(W = 2, V = 20, Ci = Initial_conc, Cf = Equilibrium_conc,
Cf_Des = Cf_Des, Vres= 5, Vfinal = 20, onebyn_ads = 0.2056263))