Table 2 Isotherm models for adsorption of diazinon onto pumice*.

Models →	Freundlich		Langmuir		Temkin		Redlich–Peterson		Sips		Toth
Statistical metrics ↓	L	NL	L	NL	L	NL	L	NL	L	NL	L	NL
Parameters →	q_e: 20.65 b_F: 0.472	K_F: 20.27 b_F: 0.433	K_L: 10.48 b_L: 0.159	K_L: 10.42 b_L: 0.161	B_T: 1.412 K_T: 2.33	B_T: 1.370 K_T: 2.43	K_R: 1.813 a_R: 0.220 α: 0.923	K_R: 1.763 a_R: 0.191 α: 0.964	K_s: 8.923 b_s: 0.1592 n_s: 0.814	K_s: 10.54 b_s: 0.162 n_s: 0.962	K_th: 10.35 b_th: 0.159 n_th: 0.986	K_th: 10.73 b_th: 0.180 n_th: 0.947
R²	0.972	0.981	0.993	0.995	0.989	0.994	0.982	0.989	0.978	0.986	0.983	0.989
SAE	1.474	1.258	0.533	0.529	0.882	0.540	0.580	0.584	0.661	0.564	0.989	0.573
SSE	0.458	0.366	0.097	0.095	0.264	0.084	0.104	0.094	0.178	0.096	0.247	0.096
ARE	12.883	12.762	3.917	3.882	6.769	4.342	4.629	4.664	4.725	4.343	6.346	4.489
RMSE	0.338	0.282	0.156	0.149	0.257	0.145	0.161	0.154	0.211	0.155	0.248	0.155

*Linear (L); non-linear (NL).
\(q_{e,exp}^{i} ,q_{e, pred}^{i}\) are q_e values of experimental and predicted values respectively. p is the number of parameters; n is the number of experimental runs.
Units: Langmuir: K_L (mg/g). b_L (L/mg). Freundlich: K_F (mg^1-(1/n) L^(1/n) g^-1) and b_F is dimensionless. Temkin: K_T (L/mg). b_T (J/mol). Redlich – Peterson: K_R (L/g) and a_R(L/mg) ^nP and n_R is dimensionless. Sips: K_S,(mg/g). b_s (L/mg)ⁿ and n_s is dimensionless. Toth: K_th (L/g). b_th (mg/L)ⁿ and n_th is dimensionless exponent.

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