Determination of Copper in Different Ethanolic Matrices Using a Chloropropyl Silica Gel Modified with a Nanostructured Cubic Octa(3-aminopropyl)octasilsesquioxane

Table 3

Calculated parameters for the sorption of Cu²⁺ and Ni²⁺ onto SGAPC and values of 𝑁_𝑓 and correlation coefficient (𝑅).

Analyte	Solvent	𝑁^máximo𝑓; 10^5(mol g^−1)	𝑁𝑆; 10^5 (mol g^−1)	𝐾; 10^−3 (L mol^−1)	𝑅
Cu^2+	Water	29.1	31.1	5.259	0.999
	Water/Ethanol 42%	50.1	58.5	2.160	0.999
	Ethanol	69.1	74.2	5.585	0.998
	Ketone	158.3	191.2	1.530	0.995
Ni^2+	Water	2.6	4.6	4.705	0.998
	Water/Ethanol 42%	4.3	4.6	7.883	0.998
	Ethanol	34.5	42.6	1.374	0.998
	Ketone	152.1	313.1	0.265	0.998