Using Lead Concentrations and Stable Lead Isotope Ratios to Identify Contamination Events in Alluvial Soils

Table 2

Soil properties and lead concentrations in soil samples collected at contamined sites (MAS-13, STO-6) and uncontaminated site (RIC-9).

Soil Profile	Depth (cm)	pH	Total organic carbon (%)	Textural classa	Pb (mg kg^−1)
Contaminated sites
MAS-13
	0–20	6.09	0.31	FSL	18.73
	20–40	5.50	0.30	FSL	18.38
	40–60	5.37	0.34	FSL	22.38
	60–80	5.59	0.54	FSL	17.79
	80–100	5.46	0.12	FSL	19.18
	100–120	5.24	0.42	FSL	21.84
	120–140	3.83	0.85	FLS	36.34
	140–160	3.63	0.95	FLS	49.65
	160–180	4.07	0.75	FLS	42.18
	180–200	3.45	0.72	FLS	121.80
	200–220	3.45	1.02	SL	149.13
	220–240	3.97	0.55	MFS	22.41
STO-6
	0–20	5.03	1.48	FSL	25.25
	20–40	4.77	1.21	FSL	35.74
	40–60	4.43	0.63	FSL	37.29
	60–80	4.28	0.71	FSL	30.57
	80–100	4.56	0.36	FSL	12.32
Uncontaminated site (without hydrocarbons layer)
RIC-9
	0–20	5.38	1.44	FSL	25.73
	20–40	5.26	1.25	FSL	34.38
	40–60	4.71	1.10	FSL	34.88
Maximum value	—	6.09	1.48	—	149.13
Minimum value	—	3.45	0.12	—	12.32
Average value	—	4.70	0.75	—	38.80

a: FSL: Fine sandy loam; FLS: Fine loamy sand; SL: Sandy loam; MFS: Medium fine sand (see [24]).