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

Progress in Earth and Planetary Science

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

Location	Sampling date	Pore size	Al	Fe	TOC	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	U
Location	Sampling date	Pore size	[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