50
ents of soils. At pH more than 7.5, uranium can also enter the soil water in the
form of bi- and tricarbonate uranyl complexes: [UO 2 (CO 3 ) 3 ]
4−
and [UO 2 (CO 3 ) 2 ]
2−
(Katz et al. 1991).
Earlier, it was shown that FA with a molecular mass of 700 D and less predominates in the composition of FA of soil pore solutions. In the HA composition, compounds with a molecular mass of 2400 D were found predominantly. The fraction of
HA components, as a rule, did not exceed 10% of the mass of organic material of
pore waters (Sokolik et al. 2002).
Table 6 Activity concentration of
238
U in the soil pore solutions (А solution ) and the percentages of
organic matter (b OM ) in the solutions of their total content in the soil samples
Plot
Soil
А solution , Bq kg
−1
b OM , %
SP S 3
Sod-podzolic sandy
0.056 ± 0.009
0.171 ± 0.009
SP S 4
Sod-podzolic sandy
0.027 ± 0.004
0.210 ± 0.010
SP S 5
Sod-podzolic sandy
0.044 ± 0.006
0.188 ± 0.009
SP S 6
Sod-podzolic sandy
0.026 ± 0,004
0.171 ± 0.009
SP S 7
Sod-podzolic sandy
0.043 ± 0.006
0.210 ± 0.010
SP S 8
Sod-podzolic sandy
0.026 ± 0.003
0.130 ± 0.008
SP S 9
Sod-podzolic sandy
0.017 ± 0.002 1
0.123 ± 0.007
SP S 10
Sod-podzolic sandy
0.038 ± 0.005
0.118 ± 0.007
SP SL 1
Sod-podzolic sandy loam
0.018 ± 0.003 18.3
0.071 ± 0.009
SP SL 2
Sod-podzolic sandy loam
0.017 ± 0.003 18.5
0.070 ± 0.006
SP SL 3
Sod-podzolic sandy loam
0.018 ± 0.003 17.4
0.093 ± 0.007
SP SL 4
Sod-podzolic sandy loam
0.016 ± 0.003 16.4
0.076 ± 0.006
SP SL 5
Sod-podzolic sandy loam
0.021 ± 0.003
0.072 ± 0.006
SP SL 6
Sod-podzolic sandy loam
0.022 ± 0.004
0.078 ± 0.006
SP SL 7
Sod-podzolic sandy loam
0.019 ± 0.003
0.073 ± 0.006
SP SL 8
Sod-podzolic sandy loam
0.013 ± 0.002
0.061 ± 0.006
SP SL 9
Sod-podzolic sandy loam
0.017 ± 0.003
0.093 ± 0.007
SP SL 10
Sod-podzolic sandy loam
0.028 ± 0.005
0.076 ± 0.006
SP L 1
Sod-podzolic loamy
0.011 ± 0.002
0.040 ± 0.004
SP L 2
Sod-podzolic loamy
0.014 ± 0.002
0.040 ± 0.004
SP L 3
Sod-podzolic loamy
0.018 ± 0.003
0.077 ± 0.006
S L 1
Alluvial sod loamy
0.009 ± 0.002
0.077 ± 0.006
S L 2
Alluvial sod loamy
0.011 ± 0.002
0.074 ± 0.006
S L 3
Alluvial sod loamy
0.012 ± 0.002
0.070 ± 0.006
P3
Peaty-gley
0.014 ± 0.002
2.1 ± 0.1
P4
Peat-bog
0.0023 ± 0.0004
0.33 ± 0.02
P5
Highly mineralized peaty
0.023 ± 0.003
0.26 ± 0.2
P6
Peat-bog
0.007 ± 0.001
0.21 ± 0.01
G. A. Sokolik et al.
ents of soils. At pH more than 7.5, uranium can also enter the soil water in the
form of bi- and tricarbonate uranyl complexes: [UO 2 (CO 3 ) 3 ]
4−
and [UO 2 (CO 3 ) 2 ]
2−
(Katz et al. 1991).
Earlier, it was shown that FA with a molecular mass of 700 D and less predominates in the composition of FA of soil pore solutions. In the HA composition, compounds with a molecular mass of 2400 D were found predominantly. The fraction of
HA components, as a rule, did not exceed 10% of the mass of organic material of
pore waters (Sokolik et al. 2002).
Table 6 Activity concentration of
238
U in the soil pore solutions (А solution ) and the percentages of
organic matter (b OM ) in the solutions of their total content in the soil samples
Plot
Soil
А solution , Bq kg
−1
b OM , %
SP S 3
Sod-podzolic sandy
0.056 ± 0.009
0.171 ± 0.009
SP S 4
Sod-podzolic sandy
0.027 ± 0.004
0.210 ± 0.010
SP S 5
Sod-podzolic sandy
0.044 ± 0.006
0.188 ± 0.009
SP S 6
Sod-podzolic sandy
0.026 ± 0,004
0.171 ± 0.009
SP S 7
Sod-podzolic sandy
0.043 ± 0.006
0.210 ± 0.010
SP S 8
Sod-podzolic sandy
0.026 ± 0.003
0.130 ± 0.008
SP S 9
Sod-podzolic sandy
0.017 ± 0.002 1
0.123 ± 0.007
SP S 10
Sod-podzolic sandy
0.038 ± 0.005
0.118 ± 0.007
SP SL 1
Sod-podzolic sandy loam
0.018 ± 0.003 18.3
0.071 ± 0.009
SP SL 2
Sod-podzolic sandy loam
0.017 ± 0.003 18.5
0.070 ± 0.006
SP SL 3
Sod-podzolic sandy loam
0.018 ± 0.003 17.4
0.093 ± 0.007
SP SL 4
Sod-podzolic sandy loam
0.016 ± 0.003 16.4
0.076 ± 0.006
SP SL 5
Sod-podzolic sandy loam
0.021 ± 0.003
0.072 ± 0.006
SP SL 6
Sod-podzolic sandy loam
0.022 ± 0.004
0.078 ± 0.006
SP SL 7
Sod-podzolic sandy loam
0.019 ± 0.003
0.073 ± 0.006
SP SL 8
Sod-podzolic sandy loam
0.013 ± 0.002
0.061 ± 0.006
SP SL 9
Sod-podzolic sandy loam
0.017 ± 0.003
0.093 ± 0.007
SP SL 10
Sod-podzolic sandy loam
0.028 ± 0.005
0.076 ± 0.006
SP L 1
Sod-podzolic loamy
0.011 ± 0.002
0.040 ± 0.004
SP L 2
Sod-podzolic loamy
0.014 ± 0.002
0.040 ± 0.004
SP L 3
Sod-podzolic loamy
0.018 ± 0.003
0.077 ± 0.006
S L 1
Alluvial sod loamy
0.009 ± 0.002
0.077 ± 0.006
S L 2
Alluvial sod loamy
0.011 ± 0.002
0.074 ± 0.006
S L 3
Alluvial sod loamy
0.012 ± 0.002
0.070 ± 0.006
P3
Peaty-gley
0.014 ± 0.002
2.1 ± 0.1
P4
Peat-bog
0.0023 ± 0.0004
0.33 ± 0.02
P5
Highly mineralized peaty
0.023 ± 0.003
0.26 ± 0.2
P6
Peat-bog
0.007 ± 0.001
0.21 ± 0.01
G. A. Sokolik et al.