Computer Science
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59..107z&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 1, pp.107-114
Computer Science
77
Scientific paper
The kinetic and equilibrium fractionation effects for 13 C during CO 2 gas transfer ( k and ag-g ) have been measured in acidified distilled water. The equilibrium fractionation effects between bicarbonate and carbonate and gaseous C0 2 ( HCO 3 -g and CO 3-g ) have been measured in NaHC0 3 and NaHC0 3 + Na 2 C0 3 solutions, respectively, from 5° to 25°C. The measured fractionations, except CO 3 -g , agreed with earlier work to within 0.2 . CO 3 -g was about 2 smaller than most values previously reported. The temperature dependence of the fractionation for 13 C between bicarbonate and carbonate and gaseous CO 2 was found to be HCO 3 -g = -(0.141 ± 0.003) T (°C) + 0.05) and CO 3 -g = -(0.052 ± 0.03) T (°C) E + (7.22 ± 0.46) respectively. The fractionation during gas dissolution was CO 3 -g = -0.03) T (°C) + (1.31 ± 0.06%. and the kinetic effect during gas transfer, k , was -0.81 ± 0.16 at 21°C and -0.95 ± 0.20 at 5°C. The equilibrium fractionation between total DIC in seawater and CO 2 in air ( DIC-g ) was measured and compared with that calculated from the concentration of aqueous CO 2 , HC0 3 - and CO 3 = and individual fractionations between the three C species and CO 2 gas. The measured and calculated results showed a significant difference of up to 0.2 . We hypothesize that carbonate ion complexes likely complicate the calculation of DIC-g from individual C species. We obtain the following empirical function of DIC-g in seawater vs. temperature and the carbonate fraction ( f CO 3 ), DIC-g = (0.014 ± 0.01) Tf CO 3 - (0.105 ± 0.002) T + (10.53 ± 0.05)%., when 0.05 < f CO 3 < 0.20 and 5°C < T < 25°C
Quay Paul D.
Wilbur D. O.
Zhang James J.
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