The relationship between total dissolved carbon dioxide and its stable carbon isotope ratio in aquatic sediments |
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| Authors: | Bruce D LaZerte |
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| Institution: | Biology Department, McGill University, Montreal, Quebec, Canada H3A 1B1 |
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| Abstract: | A model is constructed to predict the stable carbon isotope ratio of the total dissolved CO2 in aquatic sediments and laboratory reactors. The major parameters of the model are the fractionation between CO2 and CH4 as well as the intra-molecular fractionation of acetate, the relative production of CH4 from CO2 reduction versus acetate fermentation, the net production ratio of CO2 to CH4 and the stable carbon isotope ratio of the source organic carbon. The model is fitted to published data and to date from the littoral sediments of Lake Memphremagog, Quebec, Canada. The inclusion of the intra-molecular fractionation factor of acetate in the model provides a good fit to the data; without this factor, the values of the other parameters necessary for a good fit appear unreasonable. |
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