Abstract
The uptake of F by aragonite is attributed to the ion-exchange process, in which one CO 3 2− ion in the structure is replaced by two F − ions. Under the equilibrium condition at 15° C and 1 atm., the partition of F between aragonite and aqueous solution is described by: log ( [ F] a F )=1.95 + 0.54 log a Ca were [F] denotes the F content of aragonite in mol/g, and a F and a C a are the aqueous activities of F − and Ca 2+, respectively. The equation was successfully applied to estimating the F content of marine aragonite.
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