Nitrogen distribution as a function of radiocarbon age in Paleosol humic acids |
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| Authors: | G Calderoni M Schnitzer |
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| Institution: | Chemistry and Biology Research Institute, Agriculture Canada, Ottawa, Ontario, Canada K1A OC6 |
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| Abstract: | Humic acids were extracted from six Paleosols (buried soils), ranging in radiocarbon ages from about 6000 to 29,000 yr. The N distribution (total N, amino acid-N, amino sugar-N, ammonia-N and “unknown” N) in each Paleosol humic acid was determined. After 6 M HCl hydrolysis, amino acid-N and ammonia-N decreased with increasing age but relative concentrations of “unknown” N increased. Aspartic acid, valine and serine were the most stable amino acids. Concentrations of amino sugars were very small, with concentrations of galactosamine exceeding those of glucosamine. The data showed that with increasing age, identifiable N components were converted to complex polymeric compounds whose identities still remain unknown. The different N-forms in HA's of geological times are valuable geochemical markers which provide useful information on the history of these soils. |
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