| one publication added to basket [13620] | Concentration effects on 137Cs, 65Zn, 60Co and 106Ru sorption by marine sediments, with geochemical implications
Aston, S.R.; Duursma, E.K. (1973). Concentration effects on 137Cs, 65Zn, 60Co and 106Ru sorption by marine sediments, with geochemical implications. Neth. J. Sea Res. 6(1-2): 225-240
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, meer
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| Auteurs | | Top |
- Aston, S.R.
- Duursma, E.K.
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| Abstract |
The uptake of137Cs, 65Zn, 106Ru and 60Co by several types of marine sediment was studied by a simple laboratory technique. The reactions were measured as functions of equilibration time, carrier concentration, sediment concentration and salinity. Large values of the distribution coefficients of these radioisotopes at sediment concentration of 0,05mg/ml were interpreted as nucleation, respectively aggregation of particulate forms of the radioisotopes by sediment particles. Constant distribution coefficients are found at higher sediment concentrations where nucleation is masked by adsorption onto the sediment particles. 137Cs was found to have an uptake proportional to the illite content of the sediments, probably involving an ion-exchange reaction with potassium. The other radioisotopes showed less specific adsorptions. All radioisotope sediment reactions could be represented by the Freundlich isotherm model. The consequences of the uptake, especially the high particulate proportions of the radioisotopes at low sediment concentrations, were discussed with regard to the supply of trace elements to bottom sediments in the open ocean and the availability of artificially introduced radioactivity to filter feeders and benthic life. |
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