Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2147a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 8, pp.2147-2151
Physics
6
Scientific paper
The diffusion coefficient of dissolved silica at 25.5 ± .5° C was determined as a function of concentration using a non-steady-state method whereby agar-gelled solutions containing dissolved silica from 0.09 to 1.50 mM ( pH = 5.5) were placed in contact with distilled water in glass cells. Diffusion coefficients were obtained by measuring the dissolved silica content of the distilled water after a given length of time. The measured diffusion coefficients decreased as a function of increasing dissolved silica concentration, which is thought to reflect an increase in dimeric silica according to the equilibrium: 2 Si ( OH ) 4 = Si 2 O ( OH ) 6 + H 2 O . The tracer diffusion coefficients for Si(OH) 4 and Si 2 O(OH) 6 and an association constant for the above reaction were determined by fitting the following equation to the experimental data: D obs = D monomer + (1 - ) D dimer where is the fraction of total dissolved silica which is Si(OH) 4 . The best fit yielded tracer D 's for Si(OH) 4 and Si 2 O(OH) 6 of 2.2 and 1.0 (in units of 10 -5 cm 2 sec -1 ), respectively, and an association constant of 330.
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