Table 2. DLS and BET Analyses of Pure and Humic-Coated Hydroxyapatite Nanoparticles^a.

	HA	S1	S2	Y1	Y2	Y3
ζ-potential (mV)	–1.7 ± 0.1	–18.5 ± 0.2	–8.4 ± 0.2	–19.8 ± 0.6	–31.7 ± 0.2	–22.8 ± 0.3
zeta average (nm)	3107 ± 40	414 ± 27	1947 ± 134	781 ± 84	688 ± 51	510 ± 43
SSA (m2/g)	88.5 ± 4.0	85.1 ± 4.0	86.3 ± 4.2	94.3 ± 4.9	89.2 ± 4.2	93.4 ± 4.5

^aData represent means ± SD (n = 4).