Table 1.

Dissolved fraction of the nano-metal-oxide (nMeO) particles in the stock suspension concentrations before (0 min) and after 30 min sonication ^a.

nMeO	Fraction (%)
	0 min	30 min
nCeO2	0.02 ± 0.00	0.03 ± 0.01
nMgO	0.69 ± 0.04	0.81 ± 0.16
nFe3O4	38.41 ± 3.02	34.34 ± 2.75

^a Data are means ± SD (n = 2).