Table 3.

Correlation analysis of the relationships between binding parameters of HA-Zn(II) complexes at pH 6.00 and selected chemical properties of HAs.

	EEM-RAW
	N	N/C	COOH	COOH + OH	E4/E6	E254/E436	∆logK
α-area
f	0.91	0.97	−0.12	0.08	−0.91	−0.98 *	−0.74
K	0.97 *	0.93 *	−0.39	−0.19	−0.85	−0.86	−0.50
β-area
f	0.09	0.00	−0.65	−0.21	−0.94	−0.95 *	−0.90
K	0.38	0.41	0.57	0.23	0.78	0.80	0.90
γ-area
f	0.22	0.24	−0.48	−0.15	−0.94 *	−1.00 *	−0.97 *
K	0.56	0.55	−0.38	−0.03	−0.88 *	−0.95 *	−0.83
α-area
f	0.22	0.24	−0.51	−0.19	−0.96 *	−0.99 *	−0.99 *
K	0.93 *	0.94 *	0.11	0.15	−0.09	0.02	0.20
β-area
f	0.31	0.33	−0.28	0.22	−0.99 *	−0.99 *	−0.93
K	0.99 *	0.98 *	0.17	0.39	−0.32	−0.29	−0.03
γ-area
f	0.21	0.24	−0.47	−0.15	−0.95 *	−0.99 *	−0.99 *
K	0.69	0.67	−0.25	0.08	−0.74	−0.84	−0.65
ω-area
f	0.95 *	0.92 *	−0.41	−0.21	−0.90	−0.87	−0.56
K	0.94	0.87	0.00	0.19	−0.46	−0.78	−0.13
	EEM-NMF
	N	N/C	COOH	COOH + OH	E4/E6	E254/E436	∆logK
α-area
f	0.41	0.45	−0.33	0.02	−0.89 *	−0.97 *	−0.90 *
K	0.06	0.12	0.59	0.32	0.81	0.91 *	0.91 *
β-area
f	0.41	0.42	−0.26	0.24	−0.98 *	−0.98 *	−0.88
K	0.75	0.83	0.65	0.56	0.33	0.36	0.53
γ-area
f	0.19	0.20	−0.45	−0.12	−0.91 *	−0.99 *	−0.97 *
K	0.87	0.95 *	0.18	0.24	−0.14	−0.01	0.12
ω-area
f	0.93	0.92	−0.38	−0.18	−0.93	−0.89	−0.63
K	−0.67	−0.86	−0.25	−0.42	0.78	0.94	0.87

* significance at the 0.05 level.