Table 1.

Complexation constants (K_sv) for complexation between LOPC and metal ions.

Complex	Metal Ion Concentration (μmol/L)	Maximum Emission Wavelength of Complex (nm)	Complexation Constant Ksv (× 106 L/mol)	${\mathbf{R}}^{\mathbf{2}}$	$\sqrt{{\mathit{s}}^{\mathbf{2}}}$
Al3+-PC	≤ 0.15	350	1.02	0.99967	0.00174
Cu2+-PC	≤ 0.15	350	8.31	0.99973	0.00335
Ba2+-PC	≤ 0.15	350	2.16	0.99987	0.00076
Fe3+-PC	≤ 0.15	350	21.05	0.99422	0.37551
Ni2+-PC	≤ 0.15	350	2.115	0.99694	0.01984