Geochemical Association of Ni ²⁺ , Zn ²⁺ , Pb ²⁺ , Ag ⁺ , Cu ²⁺ , and Co ²⁺ Ions in Natural Pyrite

Table 2

Monolayer coverage and adsorption coefficient for metal ion adsorption at different pH.

Metal ions	pH 4		pH 5		pH 6		pH 7		pH 8		pH 9		pH 10
	Γ∞	K×10^5	Γ∞	K×10^5	Γ∞	K×10^5	Γ∞	K×10^5	Γ∞	K×10^5	Γ∞	K×10^5	Γ∞	K×10^5
Ni^2+	0.0384	0.2141	0.0384	0.2429	0.0388	0.0355	0.0390	0.8325	0.0391	3.4894	0.0399	715.8965	0.0400	2213.7522
Zn^2+	0.0365	0.0445	0.0370	0.0555	0.0372	0.0627	0.0372	1.0392	ND	ND	ND	ND	ND	ND
Pb^2+	0.0395	5.0620	0.0397	5.8835	0.0396	21.8618	ND	ND	ND	ND	ND	ND	ND	ND
Ag^+	0.0387	0.4928	0.0390	0.5511	0.0386	3.1112	0.0394	1.4277	0.0390	1.5385	ND	ND	ND	ND
Cu^2+	0.0386	0.2230	0.0386	0.3803	0.0394	46.5077	ND	ND	ND	ND	ND	ND	ND	ND
Co^2+	0.0383	0.2168	0.0383	0.2023	0.0384	0.2606	0.0388	0.8589	0.0384	4.3945	ND	ND	ND	ND

ND: not determinable.