Table 1

pH of Point of Zero Charge and BET specific surface area of tested minerals.
Minerals	pH_PZC	SSA(m²/g)

Aluminum oxide	8.9^a	90.1^a
Silicon oxide	2.3^a	90.0^a
Titanium oxide	6.5^c	40.5^a
Montmorillonite	5.9^d	99.0^d
Kaolinite	4.5–5.0^b	22.4^b
Illite	3.5^b	24.0^b

Sources: a – Degussa (1991); b – this work; c – Torrents and Stone (1991); d – Buerge and Hug (1999)
Lan et al. Geochemical Transactions 2007 8:4 doi:10.1186/1467-4866-8-4