Table 1. Physicochemical characteristics of the soil samples.

Site	Sample	SiO2	Al2O3	Fe2O3	P2O5	CaO	Na2O	K2O	TOC	pH	CFU/g soil (×105)	Total uranium (ppm)	Soluble Uranium (µM)
Vénachat	U1-06	71	16.79	2.51	0.62	0.31	3.2	4.1	-	4.6	4.2	2,617	-
	U2-06	63	17.26	2.27	0.81	4.31	4.97	4.07	0.52	4.6	2.2	2,140	-
	U-07	60.1	17.5	3.1	0.77	0.44	2.94	4.38	1.38	4.4	-	4,718	21
	C-06	-	-	-	-	-	-	-	0.56	4.9	2.2	30	-
	C-07	70.8	15.5	1.42	0.51	0.42	4.09	2.76	1.35	4.8	-	71	0.72
Villard	U-06	-	-	-	-	-	-	-	0.43	4.7	-	37,768	-
	U-07	58.62	18.06	2.13	1.6	0.2	0.51	5.45	0.17	3.8	6.8	14,860	81
	U-09	61.42	18.54	2.68	0.87	0.18	0.43	5.23	0.48	4	9	255,000	-
	C-06	-	-	-	-	-	-	-	0.61	4.7	-	27	-
	C-07	64.8	18.01	2.88	0.08	0.12	1.82	5.26	0.29	3.8	5	74	0.1
	C1-09	60.33	21.73	2.8	0.06	0.17	1.62	6.55	0.12	4.5	11.7	<30	-
	C3-09	59.46	20.68	2.55	0.13	0.18	0.98	5.75	0.25	4.5	15	<30	-
	C4-09	62.26	20.96	2.43	0.08	0.25	2.25	5.51	0.45	4.8	16.9	<30	-
	C5-09	67.54	18.5	2.34	0.07	0.13	0.86	5.33	0.13	4.8	20.7	124	-
	C6-09	69.16	16.92	2.09	0.07	0.17	1.9	4.89	0.15	4.8	21.9	<30	-

Major elements and TOC are given in weight percent. Soluble uranium was determined after three successive lixiviations with water.

-: not determined.