/ / CO 2 250 750 H 2 S 1 10 Rn 3.5 10 Li + 1 5 F - 1(2) 5 Fe 2+,Fe 3+ 1 10 As 3+ 0.1 1 Br - 5 25 I - 1 10 HBO 2 5 50 H2 SiO 3 25 75