Computer Science
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.1329s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 7, pp.1329-1337
Computer Science
10
Scientific paper
In order to discern the D water - D CH 4 relationship between C0 2 /H 2 reduction and acetate fermentation in freshwater environments where CH 4 is produced from both C0 2 /H 2 and acetate, incubation experiments of a paddy soil were made, using water with four different SD values. From the observed D water - D CH4 relationships and a fractional contribution of acetate estimated from 13 C of CH 4 , D water - D CH 4 relationships were obtained for C0 2 /H 2 reduction and for acetate fermentation, respectively. The relationships were expressed as follows; D CH 4 (co 2 ) = (0.683 ± 0.020) D water - (317 ± 20) D CH 4 (Ac) = (0.437 ± 0.045) D water - (302 ± 15). The obtained difference in D between freshwater and CH 4 from C0 2 /H 2 (317%) was much larger than that reported in marine sediments (180%). Accordingly, no significant difference in D of CH 4 between CO 2 /H 2 reduction and acetate fermentation is expected when the D of water is close to SMOW, and D of CH 4 from C0 2 /H 2 is lower than that from acetate when the D of water is low. The large fractionation obtained for C0 2 /H 2 reduction may be caused by a high H 2 concentration in the freshwater soil which is rich in easily decomposable organic matters. The estimated slope (0.437) of the D water - D CH 4 relationship for acetate fermentation indicates that some of the hydrogen atoms in the methyl group of acetate exchanged with water during the acetate production. On the basis of the experimental results, the range of D- 13 C for CH 4 from C0 2 /H 2 reduction and that for acetate fermentation were calculated for the freshwater environments. Although only a negative correlation between D and 13 C of CH 4 has been expected, our results indicate the possibility of a positive correlation between them in freshwater areas.
Sugimoto Atsuko
Wada Eitaro
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