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Table 2 Changes in the 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

Borehole Sampling date Interval volumes V / V 0 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]
09MI20 2012.10.9 0 0 5.3 11 1.8 4.2 7.6 1.1 4.8 1.3 n.d. 2.1 0.6 4.8 1.6 6.2 0.9 5.6 1.0 12
2012.10.9 155 5 5.8 4.0 1.3 4.0 8.6 1.2 5.9 1.7 n.d. 2.8 0.8 6.9 2.2 8.5 1.2 7.5 1.4 4.2
2012.10.10 310 10 6.1 3.6 0.8 3.9 8.3 1.2 5.5 1.7 n.d. 2.6 0.6 5.9 1.8 7.2 0.9 6.4 1.1 2.9
2012.10.11 620 20 7.3 3.4 0.8 4.3 8.9 1.3 6.2 1.8 n.d. 2.7 0.7 6.2 1.9 7.8 1.1 7.0 1.3 3.7
10MI26 2012.10.9 0 0 13 3.3 1.3 3.5 6.3 0.9 4.2 1.1 n.d. 1.9 0.5 4.8 1.5 5.7 0.8 5.3 0.8 11
2012.10.9 120 5 7.5 3.1 1.2 3.7 6.6 1.0 4.6 1.4 n.d. 2.0 0.6 5.2 1.6 6.2 0.9 5.5 0.9 4.0
2012.10.10 240 10 5.7 2.8 1.3 4.0 7.6 1.1 5.2 1.4 n.d. 2.4 0.7 5.6 1.8 6.7 1.0 5.7 0.9 4.2
2012.10.11 480 20 5.3 2.4 1.3 3.8 7.9 1.2 5.0 1.5 n.d. 2.4 0.6 5.8 1.8 7.0 1.0 6.0 1.0 5.3
  1. V/V 0 indicates the ratio of the total groundwater flow-through volume to the packer volume of the sampling intervals in the boreholes. Ultrafiltration was conducted using 0.2 μm membranes. Groundwater samples were collected during replacement (purging) of the groundwater in the 09MI20 and 10MI26 boreholes.