title: Bioavailability of radiostrontium in soil: experimental study and modeling.
abstract: Parameters related to 90Sr mobility in the soil-plant system are reported: exchangeable content, selectivity coefficient, and transfer factor. Large mobility of 90Sr in different soil types was shown. The fraction of exchangeable 90Sr varied between 70 and 90%. The selectivity coefficient K(C)(90Sr/Ca) values were in the range 1.3-2.5. The radionuclide transfer factors (TF) varied by a factor of 9.6 for barley seedlings and by a factor of 6.6 for lupine seedlings. The exchangeable Ca content was the determinant soil parameter responsible for differences in 90Sr biological availability. A static model was devised that describes 90Sr sorption from soil solution by soil and on the root surface. The parameter of 90Sr bioavailability (A) has been suggested. Parameter A was calculated from data on soil exchangeable Ca content and 90Sr mobility indicators--exchangeable fraction of the radionuclide and the selectivity coefficient K(C)(90Sr/Ca). A correlation was found between TF and parameter A.
authors.affiliation: Russian Institute of Agricultural Radiology and Agroecology, 249032 Obninsk, Russia. lab22@riarae.obninsk.org
authors.forename: A A
authors.initials: AA
authors.lastname: Sysoeva
authors.forename: I V
authors.initials: IV
authors.lastname: Konopleva
authors.forename: N I
authors.initials: NI
authors.lastname: Sanzharova
mesh_terms: D001682:Biological Availability; D001467:Hordeum / Q000737:chemistry; D031297:Lupinus / Q000737:chemistry; D008962:Models, Theoretical; D036226:Seedlings; D012990:Soil Pollutants, Radioactive / Q000493:pharmacokinetics*; D013324:Strontium / Q000493:pharmacokinetics*; D013326:Strontium Radioisotopes / Q000493:pharmacokinetics
chemical_list: D012990:Soil Pollutants, Radioactive; D013326:Strontium Radioisotopes; D013324:Strontium