The Geochemistry of Uranium in Marine Sediments and SedimentPore Waters

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This is a study of uranium geochemistry in the anoxic sediments of the Black Sea. The investigator is studying the mechanism by which uranium is precipitated from seawater. Experiments are designed to determine the relative role of organic complexation and the reduction of u+6 to U+4 in the precipitation process. The Black Sea serves as a ready made laboratory where the uranium in seawater has already been reduced to the +4 state before it diffuses into the sediments. The samples were collected during the Black Sea expedition (April-July, 1988) and in this project they will be analyzed and interpreted. The ultimate goal of the research is to understand the sources and the sinks of uranium in seawater.