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Table 1 Average chemical concentration of major elements in the MIU groundwaters

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

Location Depth (mbgl) Packer interval (mabh) Sampling term pH Temperature (°C) Eh (vs. SHE) Na + K + Ca 2+ Mg 2+ TC TIC TOC Alkalinity SO 4 2− F Cl NO 3 Br NH 4 + PO 4 3− Si B
(mV) [mg/L] [mg/L] [mg/L] [mg/L] [mg/L] [mg/L] [mg/L] [meq/L] [mg/L] [mg/L] [mg/L] [mg/L] [mg/L] [mg/L] [mg/L] [mg/L] [mg/L]
07MI07 200 38.7 to 47.2 2010.4.21 to 2012.12.10 8.76 ± 0.15 15.8 ± 5.7 −180 ± 30 82 ± 4 0.4 ± 0.1 12 ± 1 <0.1 14 ± 1 14 ± 1 0.6 ± 0.1 1.2 ± 0.1 13 ± 1 8.9 ± 0.3 77 ± 10 <0.05 0.16 ± 0.05 0.15 ± 0.05 <0.5 6.8 ± 0.1 1.1 ± 0.1
09MI20 300 34.8 to 57.8 2010.4.27 to 2012.12.4 8.44 ± 0.12 19.7 ± 3.9 −110 ± 20 110 ± 7 0.7 ± 0.1 16 ± 3 0.9 ± 0.1 15 ± 1 15 ± 1 0.6 ± 0.1 1.2 ± 0.1 10 ± 1 8.8 ± 0.3 130 ± 20 <0.05 0.23 ± 0.06 0.12 ± 0.04 <0.5 6.7 ± 0.2 1.3 ± 0.1
10MI26 400 37.9 to 49.6 2011.1.15 to 2012.12.5 8.40 ± 0.10 24.1 ± 2.9 −210 ± 30 120 ± 5 0.8 ± 0.1 17 ± 2 0.8 ± 0.1 14 ± 1 13 ± 1 0.6 ± 0.2 1.1 ± 0.1 7 ± 1 8.6 ± 0.3 160 ± 20 <0.05 0.29 ± 0.04 0.12 ± 0.04 <0.5 6.8 ± 0.2 1.5 ± 0.1
ASP-198 300 - 2010.4.2 to 2012.12.18 8.66 22.9 −71 130 ± 7 0.7 ± 0.1 36 ± 4 <0.1 5.1 ± 0.4 4.8 ± 0.4 <0.5 0.41 ± 0.03 0.9 ± 0.2 8.7 ± 0.4 240 ± 20 <0.05 0.48 ± 0.05 0.21 ± 0.03 <0.5 6.8 ± 0.2 1.4 ± 0.1
ASP-199 300 - 2010.4.2 to 2012.12.18 7.99 22.3 −110 130 ± 7 0.7 ± 0.1 37 ± 3 <0.1 5.5 ± 0.5 5.2 ± 0.5 0.8 ± 0.2 0.43 ± 0.03 0.7 ± 0.2 8.7 ± 0.4 240 ± 20 <0.05 0.49 ± 0.06 0.2 <0.5 6.6 ± 0.2 1.4 ± 0.1
  1. On-site measurements of pH, temperature, and Eh for the seepage groundwater were single-point measurements. Groundwater samples were collected from the 07MI07, 09MI20, and 10MI26 boreholes, and from the A-SP-198 and the A-SP-199 water conducting fractures in excavation walls. mabh, meters along borehole (from collar).