Mathematics – Logic
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.2045c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 10, pp.2045-2051
Mathematics
Logic
3
Scientific paper
Humic acids and fulvic acids were extracted from six paleosols in Southern Italy. Humic acids (HAs) constituted between 96.5 and 99.2% of the total extracts; the remaining materials consisted of fulvic acids (FAs). Radiocarbon ages of the HAs ranged from about 6,000 to close to 29,000 years B.P., 13 C values averaged -25.6 ± 0.3 The HAs were characterized by chemical (elemental and functional group analyses) and spectroscopic (IR, ESR, 13 CNMR, E 4 /E 6 ratios) methods. FAs were characterized by chemical methods, E 4 /E 6 ratios and IR spectra. The chemical and spectroscopic analyses showed practically no differences in the chemical structure and composition of the six HAs and FAs, so that age appeared to have little effect on these parameters. The paleosols were found to be closed systems with low polysaccharide and protein contents, thus providing unfavorable substrates for microbial activity. The preservation of the humic materials in the paleosols may have been due to low biological activity and/or to retention by amorphous minerals. The HAs did not appear to be affected by temperatures higher than 170-200°C over the 23,000 year period which we observed.
Calderoni Gilberto
Schnitzer Morris
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