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Table 3 Size-fractionated chemical concentrations of colloid-forming elements (Al, Fe, and TOC), REE, and U in the groundwater

From: Distribution of U and REE on colloids in granitic groundwater and quality-controlled sampling at the Mizunami underground research laboratory

Location Sampling date Pore size Al Fe TOC La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu U
[μg/L] [μg/L] [mg/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L] [ng/L]
A-SP-198 2012.9.12 Unfiltered 18 3.2 n.d. 9.1 18 2.2 8.8 2.2 0.1 2.8 0.5 3.5 0.9 2.8 0.3 1.9 0.3 4.5
2012.9.12 0.2 μm 18 4.2 n.d. 3.7 6.2 0.9 3.7 1.0 0.1 1.4 0.3 2.2 0.7 2.0 0.3 1.5 0.3 1.5
2012.9.12 200 kDa 18 3.5 n.d. 1.7 3.3 0.5 1.8 0.6 n.d. 0.6 0.1 0.8 0.3 0.8 0.1 0.6 0.2 2.8
2012.9.12 50 kDa 18 4.1 n.d. 1.1 1.9 0.3 1.1 0.4 n.d. 0.5 0.1 0.8 0.3 0.9 0.2 0.6 0.2 1.3
2012.9.12 10 kDa 16 3.5 n.d. 1.1 1.7 0.3 1.1 0.3 n.d. 0.5 n.d. 0.8 0.3 0.8 0.2 0.6 0.2 4.9
A-SP-199 2012.9.12 Unfiltered 9.2 3.6 n.d. 3.4 4.5 0.6 2.8 0.9 n.d. 1.5 0.3 2.4 0.6 2.1 0.2 1.3 0.2 2.3
2012.9.12 0.2 μm 9.4 3.6 n.d. 1.6 2.4 0.4 1.4 0.5 n.d. 0.6 0.2 1.1 0.4 1.1 0.2 0.7 0.2 2.0
2012.9.12 200 kDa 9.7 3.6 n.d. 1.2 1.9 0.4 1.1 0.4 n.d. 0.5 0.1 0.9 0.3 1.0 0.2 0.7 0.2 2.1
2012.9.12 50 kDa 9.1 3.7 n.d. 1.5 2.3 0.4 1.4 0.4 n.d. 0.5 0.1 1.1 0.4 1.1 0.2 0.8 0.2 1.1
2012.9.12 10 kDa 9.0 3.2 n.d. 0.7 1.0 0.2 0.7 0.2 n.d. 0.3 n.d. 0.6 0.2 0.6 0.1 0.5 0.2 0.92
  1. Groundwater samples were collected from A-SP-198 and A-SP-199 fractures.