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Increase of 14C Activity of Dissolved Inorganic Carbon Along a River Course

Published online by Cambridge University Press:  18 July 2016

Dušan Srdoč ,
Ines Krajcar-Bronić ,
Nada Horvatinčić  and
Bogomil Obelić
Dušan Srdoč
Affiliation:
Rudjer Bošković Institute, P O B 1016, 41001 Zagreb, Yugoslavia
Ines Krajcar-Bronić
Affiliation:
Rudjer Bošković Institute, P O B 1016, 41001 Zagreb, Yugoslavia
Nada Horvatinčić
Affiliation:
Rudjer Bošković Institute, P O B 1016, 41001 Zagreb, Yugoslavia
Bogomil Obelić
Affiliation:
Rudjer Bošković Institute, P O B 1016, 41001 Zagreb, Yugoslavia
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Abstract

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Results of measurements for 3 years (1981–1983) of 14C activity of dissolved inorganic carbon (DIG) in water samples from the Korana River, as well as that of recent tufa and aquatic plants, showed that 14C concentration increases from karst spring to the estuary. A model describing the increase of 14C activity was developed assuming that the increase is due to the exchange of the dissolved CO2 in stream water with atmospheric CO2 and to dissolution of CO2 from the decay of organic material and root respiration. It is possible to distinguish these two contributions by measuring the δ13C values of DIC in water. As expected, our data show that the exchange process between atmospheric CO2 and DIC dominates at rapids and waterfalls, while biologic contribution is much higher in lakes and along the lowland flow of the Korana River. Agreement between the calculated and the measured activities supports the proposed mechanisms of chemical and isotopic exchanges in stream waters.

Type
IV. Methods and Applications
Information
Radiocarbon , Volume 28 , Issue 2A , 1986 , pp. 515 - 521
Copyright
Copyright © The American Journal of Science 

References

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