Computer Science
Scientific paper
Dec 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.2361h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 31, Issue 12, pp.2361-2378
Computer Science
6
Scientific paper
The carbon, hydrogen and nitrogen contents of 53 specimens of recent and fossil mollusc shells were determined by a gas-chromatographic method. The method, which permits the determination of small quantities of organic carbon and nitrogen in the presence of calcium carbonate, is described. The results on modern shells show a spread of carbon-nitrogen values, from those typical of proteins in nacro-prismatic shells to much higher values. In fossils, the total amount of carbon and nitrogen is greatly reduced and the carbon nitrogen ratio increased. Some recrystallized shells, with petrographic evidence of organic inclusions, gave positive organic carbon but no detectable nitrogen. The hydrogen content of shells dried at 110°C is shown to be much higher than can be accounted for by the organic content, especially in nacreous shells. It is proposed that the hydrogen represents free water, trapped in the shell structure, and not a hydrate or a hydroxy-compound.
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