Table 2.

Fluorescence data of aqueous, adsorbed, and soil reference species.

U(VI) species	Lifetime (µm)	Main emission bands (nm)				Line width (description)	Reference
UO22+	0.9-2	488	509	533	559	Narrow	[64,65]
UO2(OH)+	32.8-80	497	519	544	570	Narrow	[64]
(UO2)2(OH)22+	2.9-9.5	497	519	542	570	Narrow	[65,66]
(UO2)3(OH)5+	6.6-23	496	514	535	556	Broad	[64,66]
(UO2)3(OH)7-	10-230	503	523	547	574	Broad	[64,66]
UO2OSi(OH)3+	19	500	521	544	570	Broad	[75]
Uranyl hydroxide solids
Fresh precipitate	63	Not determined				Structureless	[76]
Aged precipitate	131	Not determined				Structureless
Sorbed U(VI) surface species on montmorillonite
S1	170-270	500	521	545	570	Broad	[76]
S2	2-12	494	513	533	555	Broad
S3	15-25	Not determined				Structureless
S4	80-110	504	525	549	575	Narrow
Sorbed U(VI) surface species on the edge faces of muscovite
1	1.15	503	522	545	569	Structureless	[71]
2	9.65	502	522	545	570	Structureless
schoepite	63-131	Not determined				Structureless
Sorbed U(VI) surface species on silica
≡SiO2UO2	0.17	Not determined				Broad	[22]
≡SiO2UO2OH-	0.36	Not determined				Broad
Sorbed U(VI) surface species on albite
τ1	0.49-1.5	500	521	543	573	Structureless	[77]
τ2	10.6-21	500	520	543	570	Broad