Table 1. Composition of Seawater Used in the Analysis.

Species	Molality (m, mol/kg)based on Reference Composition20	Molality (m,mol/kg) after equilibration at 420 ppm of CO2(g)
Na+	0.4860597	0.4860597
Mg2+	0.0547421	0.0547421
Ca2+	0.0106568	0.0106568
K+	0.0105797	0.0105797
Sr2+	0.0000940	0.0000940
Cl–	0.5657647	0.5657647
SO42–	0.0292643	0.0292643
HCO3–	0.0017803	0.0021002
Br–	0.0008728	0.0008728
CO32–	0.0002477	0.0000312
F–	0.0000708	0.0000708
B [B(OH)4–, B(OH)3]	0.0004303	0.0004303
H2CO3*	0.0000100	0.0000124
ΣCO2	2.038 mmol/kg	2.141 mmol/kg
pH	8.352	8.170
pCO2 (in atm)	–3.78	–3.38