Liquid-Liquid Extraction of Transition Metal Cations by Glyoximes and Their Macrocyclic Glyoxime Ether Derivatives

Table 2

Extraction of metal cations with L1 (%).

Metals	% Extraction
	pH ≅2,00	pH ≅3,00	pH ≅4,00	pH ≅5,00
Ni^+2	54,54 ± 0,81	12,74 ± 0,45	4,50 ± 0,36	5,67 ± 0,40
Co^+2	71,33 ± 0,32	24,29 ± 0,24	1,00 ± 0,09	10,12 ± 0,18
Cu^+2	67,46 ± 0,29	42,89 ± 0,69	63,61 ± 0,86	70,44 ± 1,01
Zn^+2	65,61 ± 0,46	11,37 ± 0,34	1,47 ± 0,17	1,16 ± 0,15
Cd^+2	71,00 ± 0,12	22,91 ± 0,38	7,32 ± 0,28	3,66 ± 0,12
Pb^+2	63,42 ± 1,06	24,06 ± 0,11	6,62 ± 0,16	5,74 ± 0,17
Hg^+2	46,38 ± 0,17	21,20 ± 0,20	20,93 ± 0,19	13,33 ± 0,18

aH₂O/CH₂Cl₂ = 10/10 (v/v); [picric acid] = 2 × 10⁻⁵ M, [ligand] = 1 × 10⁻³ M, and [metal nitrate] = 1 × 10⁻² M, 298 K, 1 h contact time.
Averages and standard deviations calculated for data are obtained from five independent extraction experiments.