Table 2.

Exemplary geometrical and hydrodynamic parameter for the artificial soil column as used in the PET experiments #3 and #4 with the reactive [⁶⁴Cu](Cu-MCPA₂) tracer (suffix e = experimental data, c = calculated).

Parameter	Sign	Value column #3	Value column #4	Unit
Inner diametere	d	40.0 ± 0.05	40.0 ± 0.05	mm
Colum lengthe	l	100.0 ± 0.05	100.0 ± 0.05	mm
Cross-sectional areae	A	12.57 ± 0.45	13.2 ± 0.45	cm2
Height of fillinge	h	94.5 ± 0.05	90.1 ± 0.05	mm
Volume of fillinge	V c	119 ± 6.0	114 ± 5.7	cm3
Dry mass of fillinge	m d	228.3 ± 0.1	206.8 ± 0.1	g
Wet mass of fillinge	m w	262.4 ± 0.1	239.4 ± 0.1	g
Total pore volumee	V p	34.1 ± 6.0	33.6 ± 5.7	mL
Bulk density of fillinge	ρ B	2.66	2.66	g cm−3
Porositye	θ	0.29 ± 0.05	0.30 ± 0.05	—
Pressure gradiente	Δp	0.20 ± 0.01	0.20 ± 0.01	bar
Flow ratee	Q	100 ± 1	100 ± 1	μL min
Permeabilityc	k f	7.1·10−8 ± 0.7·10−8	5.9·10−8 ± 0.6·10−8	m s−1
Darcy permeabilityc	K	7.3·10−3 ± 0.7·10−3	6.1·10−3 ± 0.6·10−3	Darcy
Water flow velocityc	v w	4.5·10−6 ± 9·10−7	4.6·10−6 ± 9·10−7	m s−1
Interstitial velocityc	ν	—	1.6·10−4 ± 3·10−6	m s−1
Axial dispersivityc	α L	—	8.7·10−4 ± 9·10−6	m
Mean tracer velocityc	v t	2.7·10−7 ± 1·10−9	2.4·10−7 ± 1·10−9	m s−1
Peclet numberc,*	Pe	—	200	—
Retardation factorc,**	R	17.3 ± 3.2	19.1 ± 3.6	—

*The Peclet number Pe was derived from the axial dispersivity of α_L = 8.7·10⁻⁴ m, the interstitial velocity of v = 1.6·10⁻⁴ m s⁻¹, and a molecular diffusion coefficient for MCPA of D_m = 6.8·10⁻¹⁰ m² s⁻¹.

**The retardation factor was calculated as ratio between mean water and mean tracer velocities.