Table 1.

Ionic composition and concentrations in the Kamchatka boiling pool.

cations	${\text{NH}}_4^{+}$	Na+	Ca2+	Fe3+	K+	Mg2+	Al3+	H+
mg l−1	15	14	12.4	6	4.8	3.1	3.1	—
mM	0.9	0.6	0.31	0.11	0.12	0.13	0.11	1.0

anions	${\text{SO}}_4^{2-}$	Cl−	SiO4
mg l−1	211	1.4	288
mM	2.2	0.04	3.1