Black uranium cycle

Baturin (1973b) examined the uranium cycle in the Black Sea and Azov Sea and found most transport to be in solution as a uranyl carbonate complex. The Azov Sea is a shallow-water basin in which sediments are often disturbed by storms bottom sediments have a fairly uniform and low (0.3— 2.3 pgg" ) content of uranium. The Black Sea, by contrast, is deep, with H2S-rich bottom waters of low Eh. The bottom water is strongly depleted in uranium, while the sediment is of variable, sometimes high (0.2—23.0 pg g" ) uranium content. The Black Sea sediments are said to receive up to 400 Mg of ur2mium from the water. The residence time of uranium in Azov Sea waters is only 14.5 y, but in Black Sea water, is of the order of 3000—4000... 

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