Determination of bioavailable rhenium fraction in agricultural soils.
Rhenium (Re) mobility in agricultural soils was studied in order to obtain information relevant to (99)Tc mobility in soil-to-plant systems. Since water soluble Tc and Re are highly bioavailable, extraction of Re with water was carried out in addition to a total Re determination in the soils. The geometric means of total Re for paddy field, upland field and other soils were 0.34, 0.23, and 0.28 ng g(-1), respectively, while those of water soluble Re (<0.45 microm membrane filterable) were 0.053, 0.015 and 0.008 ng g(-1), respectively. There were no differences for total Re among soil uses; however, the water soluble Re/total Re ratio was significantly higher in paddy field soils (16%) than in other soil uses (6% for upland fields and 3% for other uses). Rhenium mobility and plant availability were higher in paddy fields than in other agricultural fields, and similar phenomena would be expected for (99)Tc.
Tagami
Keiko
K
Office of Biospheric Assessment for Waste Disposal, National Institute of Radiological Sciences, Anagawa 4-9-1, Inage-ku, Chiba 263-8555, Japan. k_tagami@nirs.go.jp
Uchida
Shigeo
S
D000383:Agriculture; D011834:Radiation Monitoring / Q000379:methods*; D012211:Rhenium / Q000032:analysis / Q000378:metabolism*; D012987:Soil / Q000032:analysis*; D012990:Soil Pollutants, Radioactive / Q000032:analysis / Q000378:metabolism*; D013667:Technetium / Q000032:analysis / Q000378:metabolism; D014875:Water Pollutants, Radioactive / Q000032:analysis / Q000378:metabolism
D012987:Soil; D012990:Soil Pollutants, Radioactive; D014875:Water Pollutants, Radioactive; D012211:Rhenium; D013667:Technetium