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• W172932011 abstract "In order to study the geochemistry of uranium on typical shelf zones, samples of river water and sea water, as well as samples of sediment from the Baltic Sea region, have been examined. The Baltic Sea region was chosen for the investigation since its hydrography is well known, water transport to and from it can be estimated to a high degree of accuracy, and the region can be well sampled. The uranium content of river water originating in regions of igneous rocks is low, averaging 0.5 × 10−6 g U/l. The uranium content of rivers from sedimentary rock regions seems higher by a factor of two or more, the maximum value found being 12.8 × 10−6g U/l. It may be concluded that the uranium is more easily leached out from sedimentary regions. While the southern and eastern rivers supplying water to the Baltic Sea have not been investigated, it can be assumed that their uranium content is high, especially since the sea area surrounding the mouths of these rivers exhibit high uranium values. The radium content of river water is not in equilibrium with the uranium, amounting to only 10% of the latter. It is thus concluded that uranium is more soluble than radium. The uranium content of water from the Baltic Sea is also variable, ranging from 0.77 to 5.9 × 10−6 g U/l. High salinity inflowing water shows 1.8 × 10−6 g U/l., while that of outflowing water is less, averaging 0.9 × 10−6 g U/l. Except for the southeastern regions and deep water areas, a marked correlation of salinity and uranium content exists. An increase of deep water uranium content correlates with a surface water increase. Surface water increases can be explained by the high uranium content of inflowing river waters; high deep water values are correlated with an oxygen deficiency. Here it may be assumed that the uranium (VI) is reduced to uranium (IV) forming insoluble complex compounds with organic material. This settles slowly to the bottom, and explains the rather high uranium content of the sediment (values range between 3·2 and 10·3 × 10−6 g U/g; the normal content in clays is about 2 × 10−6g U/g). By an intense study of the distribution of uranium in sediments, completed by age determination by aid of carbon-14, it may be possible to follow the changes in the past of the state of ventilation of the deep basins of the Baltic Sea. The attempt to work out a uranium balance sheet for Baltic Sea uranium demonstrates precipitation about equals that which is brought in by rivers. Influx totals 1100 to 1400 metric tons per year, efflux 700 to 1000, leaving about 100 to 700 tons of precipitated material. The investigation carried out shows that a considerable quantity of uranium is precipitated on the Baltic Sea shelf. It appears to be caused by biological activity in the sea which in turn causes an oxygen deficiency. The process is slow. Rivers with a high uranium content can raise the uranium content of the sea water if they empty under conditions wherein the above factors are not fulfilled. On the other hand, in estuaries and bays into which uranium bearing rivers do not flow, uranium can be precipitated from sea water by a high biological activity, which is connected with oxygen deficiency. When the minerogenous sedimentation is at the same time very small, the uranium content of the sediment is enriched, amounting to 200 × 10−6g U/g and more." @default.
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• W172932011 date "1957-01-01" @default.
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• W172932011 title "Zur geochemie des urans im ostseebecken" @default.
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• W172932011 doi "https://doi.org/10.1016/0016-7037(57)90007-8" @default.
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