Trace Element Concentration and Speciation in Selected Mining-Contaminated Soils and Water in Willow Creek Floodplain, Colorado

Table 11

Sequential fractionation of Cd in study pedons.

Soil	Depth	CdWS	CdEX	CdSS/CAR	CdOX	CdOM/S	CdRES	Cd^aSUMSEQ
	(cm)	mg/kg						(mg/kg)
Gravelbar	0–73	0.21	1.4	6.9	1.5	3.8	0.4	14
Cottonwood	0–90	0.24	6.1	10.7	1.3	1.5	0.2	20
Spruce	0–10	0.54	3.5	14.5	1.7	4.7	0.5	25
	10–40	0.15	1.2	6.4	3.2	3.8	0.6	15
Railroad	0–61	0.63	4.7	1.7	1.3	8.2	0.7	17
	61–120	0.26	3.2	1.6	1.3	1.4	0.3	8
Western Channel	0–40	0.25	1.9	8.4	2.4	8.3	1.3	23
Salty	0–20	19.44	21.1	35.9	3.0	2.9	0.9	83
North	0–40	0.41	2.2	8.5	2.8	9.6	0.9	24
South	0–40	0.69	3.7	2.9	1.4	3.7	0.9	13
Denuded Mound	0–40	5.36	8.4	2.7	0.8	7.1	0.6	25
Sedge Mound	0–40	0.08	0.21	2.79	0.27	0.58	0.05	4

  ^aCd_SUMSEQ=Cdsum(WS+EX+SS/CAR+OX+OM/S+RES).