Table 1.

Sips isotherm parameters for roxarsone with various adsorbents at pH 7.00 in water at 21 °C. (Adsorbent dosage: ~15 mg; C_o: (0.025~1.0 mM); V = 0.020 L).

Adsorbents	Qm (mmol/g)	Ks (L/g)	n	R2	Chi2/DoF
Mag-P	0.500 ± 0.083	3.50 ± 2.00	0.559 ± 0.086	0.991	2.00 × 10−4
Mag-C	0.102 ± 0.008	19.3 ± 13.5	0.624 ± 0.104	0.977	4.00 × 10−5
Mag-32	0.862 ± 0.066	12.1 ± 5.0	0.812 ± 0.078	0.996	3.40 × 10−4
Mag-19	0.936 ± 0.096	39.7 ± 32.6	1.15 ± 0.18	0.990	1.13 × 10−3
Mag-10	1.39 ± 0.45	12.9 ± 14.0	1.34 ± 0.25	0.993	6.30 × 10−4
GAC	1.78 ± 0.27	3.05 ± 1.70	0.662 ± 0.132	0.995	1.78 × 10−3
Goethite	1.59 ± 1.00	0.792 ± 0.789	0.815 ± 0.135	0.992	4.20 × 10−4

Note: Chi²/DoF (degree of freedom) is a diagnostic goodness-of-fit parameter.