Quantitative study on the interaction of Sn2+ and Zn2+ with some phosphate ligands, in aqueous solution at different ionic strengths

Sequestration diagrams of the M/L systems at I = 0.15 mol L− 1 in NaNO3, T = 298.15 K and pH = 7.0. Fraction of M(II) vs. pL. Curves: 1: Sn/PO4, 2: Zn/PO4, 3: Sn/TPP, 4: Zn/TTP.