Physics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..495m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 3, pp.495-504
Physics
3
Scientific paper
This study presents data from experiments investigating carbon isotope exchange between carbonate solution and solid calcite using carbon-13 as a tracer. All experiments were done with calcite saturated solutions and results show that a two-step adsorption-recrystallization reaction takes place. Isotope effects are caused by exchange by carbonate on the solid surface with carbon in the aqueous phase. Adsorption reactions are characterized by a maximum isotopic exchange capacity (IEC) on crystal surfaces of about 10 11 reaction sites per cm 2 , following a second order rate law with respect to 13 C concentration in solution (constant kex 10 6 cm 5 mole -1 s -1 and half-life t 1/2 = 700 s). The adsorption reaction was followed by a first order recrystallization which is characterized by a rate constant of the order of 10 -8 s -1 and a t 1/2 of 10 7 s. Negative isotopic gradient experiments and runs with calcite crystals in Mg 2+ spiked solutions provided the preliminary basis for the characterization of the mechanisms of both proposed reactions.
Fritz Peter
Mozeto A. A.
Reardon Eric J.
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