Carbon-13 in Black Sea Waters and Implications for the Origin of Hydrogen Sulfide

Science  26 Jun 1970:
Vol. 168, Issue 3939, pp. 1575-1577
DOI: 10.1126/science.168.3939.1575


A combination of measurements of carbon-13 and the hydrogen sulfide content in Black Sea waters with available data on the total carbon dioxide in these waters indicates that the contribution of organic sulfur to the hydrogen sulfide lies between 3 and 5 percent and increases with depth. Likely causes for the increase are increasing productivity or upward movement of the anoxic zone during the facts last 2000 year.