Table 2.

Chemical composition (wt. %) of natural and gBIOs, prior and after adsorption experiment.

	BIOs	gBIOs	Loaded gBIOs
SiO2	7.88	2.54	3.07
TiO2	0.02	0.69	0.70
Fe2O3	48.47	17.50	19.35
Al2O3	0.28	0.93	1.16
CaO	2.63	30.88	29.81
MgO	0.08	2.48	3.50
MnO	0.22	0.11	0.13
K2O	0.07	0.09	0.08
Na2O	0.04	0.04	0.05
P2O5	3.11	0.03	0.04
SO3	n.a.	17.87	14.35
As2O3	n.a.	b.d.l.	0.11
LOI	35.60	26.69	27.48

LOI, loss on ignition; b.d.l., below detection limit; n.a., not analyzed.