Rubidium concentration ocean

Distribution Coefficients. The distribution coefficients determined for rubidium (at ll C) and for cesium (at ll C for -log Ci less than 5 and at for -log greater than 5) are summarized in Figure 1. Over the range of solution-phase concentrations in which both rubidium and cesium were studied, the rubidium coefficients appear to behave very similarly to those for cesium. For solution-phase concentrations on the order of 10 3 mg-atom/ml, the coefficients are on the order of 100 ml/gm, as was expected. Furthermore, the distribution coefficients obtained for cesium generally appear consistent with the corresponding coefficients obtained for similar oceanic sediments and related clay minerals found within the continental United States (6,7,8,9510,12,13). In the pH range of 6.3 to 8.0, the cesium coefficients appear to... 

For the nuclides studied (rubidium, cesium, strontium, bariun silver, cadmium, cerium, promethium, europium, and gadolinium) the distribution coefficients generally vary from about 10 ml/gm at solution-phase concentrations on the order of 10 mg-atom/ml to 10 and greater at concentrations on the order of 10 and less. These results are encouraging with regard to the sediment being able to provide a barrier to migration of nuclides away from a waste form and also appear to be reasonably consistent with related data for similar oceanic sediments and related clay minerals found within the continental United States. 

Other examples of conservative-type trace metals include caesium and rubidium. Caesi-um(l) exists at an average concentration of 2.2 nmol kg (Brewer et al., 1972) as the relatively unreactive monovalent cation Cs. Its oceanic residence time has been estimated to be 3 X 10 yr (Broecker and Peng, 1982). Rubidium exists as the monovalent cation Rb at a concentration of 1.4 pmol kg (Spencer et al., 1970) with an oceanic residence time estimated to be 3 Myr. 

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