and of the
Activity Ratio in Standard and Desalinated Seawater
A. V. Savenko
Faculty of Geology, Moscow State University, Moscow, Russia
e-mail: Alla_Savenko@rambler.ru
Received May 18, 2012; in final form, November 1, 2013
Abstract—The solubility of amorphous silica was studied in mixtures of riverine and marine waters simulating
the water composition at the river–sea geochemical barrier. The value of the thermodynamical equilibrium con-
stant was determined for the reaction of silicon solubility as 
= (1.71 
0.01) 
10–3 at 22
C. A near-linear
dependence was found for the activity ratio of the 
and the salinity with the increase of this ratio from
1.00 in the riverine to 1.15 in the standard seawater.
DOI: 10.1134/S0001437014020222
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