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

Table 13

Sequential fractionation of Cu in study soils.

Soil	Depth	CuWS	CuEX	CuSS/CAR	CuOX	CuOM/S	CuRES	Cu^aSUMSEQ
	(cm)	mg/kg						(mg/kg)
Gravelbar	0–73	0.6	1.3	20.9	16.9	41.5	10.5	92
Cottonwood	0–90	0.6	0.4	3.6	9.1	7.7	9.1	31
Spruce	0–10	1.2	1.5	26.5	35.3	47.1	15.3	127
	10–40	0.7	1.1	22.1	30.7	44.9	11.3	111
Railroad	0–61	1.8	3.5	17.1	62.8	19.4	28.7	133
	61–120	0.8	4.4	15.9	31.4	10.9	19.6	83
Western Channel	0–40	0.6	2.9	27.5	22.6	46.6	8.6	109
Salty	0–20	1.0	1.3	38.2	38.0	24.0	15.7	118
North	0–40	0.4	2.4	31.9	45.3	40.6	15.0	135
South	0–40	2.5	2.5	12.1	14.5	15.1	9.4	56
Denuded Mound	0–40	0.6	1.0	12.1	20.3	13.0	11.1	58
Sedge Mound	0–40	0.4	0.6	0.5	4.0	4.2	8.6	18

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