Table 2.

Physicochemical and mineralogical properties of particulate matter and sediment samples.

Sampling site	Sample type	Particle size or depth	137Cs (solid) (Bq/g)	NOMs (wt.%)	Illite	Vermiculite	Mica	K d a (L/g)	N-NH4 + (μmol/g)
Pripyat River (Chernobyl)	Particulate matters (PSP-1)	0.45–63 µm	1.72 ± 0.01	16.7	×b	×	○c	69.2	53.3
	Particulate matters (PSP-2)	> 63 µm	1.60 ± 0.01	14.3	×	×	○	64.3	N.A.d
Motomiya Pond (Fukushima)	Very surface layer of soft sediment	0–2 cm	9.05 ± 0.01	10.6	×	×	×	142	49.2
Ooyado Pond (Fukushima)	Very surface layer of soft sediment	0–2 cm	9.30 ± 0.01	5.9	○	○	○	251	39.3
Kuchibuto River (Fukushima)	Surface sediment	0–5 cm(63–125 µm)	0.8 ± 0.01	1.1	○	○	×	204	D.L.
	Particulate matters	> 0.45 µm	12.72 ± 0.01	10.6	○	○	○	3240	N.A.e

^aNatural distribution coefficient of  ¹³⁷Cs; ^b×: Not contained; ^c○: Contained; ^dN.A.: Not analyzed; ^eD.L.: Lower than determination limit.

Uncertainties of NOM content is better than 3%. Uncertainties of NH₄ ⁺ content is better than 5%.