The distribution coefficient of60Co in sediments from the Solway Firth, UK |
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Authors: | P McDonald K Johnston |
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Institution: | (1) Westlakes Research Institute, Moor Row, CA24 3LN Cumbria, UK;(2) School of Physics and Space Research, The University of Birmingham, Edgbaston, B15 2TT Birmingham, UK |
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Abstract: | The behaviour of60Co in sea water and sediments typical of the Solway Firth has been investigated. The distribution coefficient,K
d, of60Co2+ in sediments was determined using the batch sorption method and theK
d variation with aqueous phase composition, sediment type and pH has been studied. Adsorption of60Co by sediments was found to be highest in de-ionised water and lower in NaCl solution (31 salinity). Adsorption was lowest in natural sea water, where theK
d range was 2,270 to 2,750. Variation ofK
d with sediment grain size was observed. It was shown that60Co adsorption was strongly dependent on pH in de-ionised water, with less variation in NaCl solution. Variance of60CoK
d values were lowest in sea water in the range pH 5–8 indicating a more conservative behaviour of60Co than previously recognised. Hence60Co dispersion will be predominantly govemed by tidal behaviour. |
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