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Table 2 Langmuir and Freundlich model parameters of different apatite at pH 5.5

From: Remediation of copper contaminated soil by using different particle sizes of apatite: a field experiment

Ce (mmol L⁻¹)	Material	Langmuir				Freundlich
Ce (mmol L⁻¹)	Material	K_L	Q_m	R²	P	K_F	1/n	R²	P
0–10	NAP	43.15	742.9	0.9628	<0.05	592.1	0.1751	0.9500	<0.01
0–1	NAP	72.73	637.7	0.9815	<0.05	752.9	0.2439	0.9480	<0.01
0–1	MAP	20.84	232.4	0.9616	<0.05	243.6	0.2739	0.8882	<0.05
0–1	OAP	–	–	–	–	22.03	0.7455	0.9460	<0.05

The adsorption isotherms of MAP and OAP in 0–10 mmol L⁻¹ were not fitted by Langmuir and Freundlich models and OAP in 0–1 mmol L⁻¹ were not fitted by Langmuir models, so their model parameters are not listed

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