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

Table 14

Sequential fractionation of As in study soils.

Soil	Depth	AsWS	AsEX	AsSS/CAR	AsOX	AsOM/S	AsRES	As^aSUMSEQ
	(cm)	mg/kg						(mg/kg)
Gravelbar	0–73	0.6	1.8	15.4	70.5	4.6	53.2	146
Cottonwood	0–90	0.2	0.3	3.5	34.0	2.3	15.6	56
Spruce	0–10	0.7	2.2	25.7	143.7	8.7	70.7	252
	10–40	0.9	2.7	25.0	214.5	8.0	103.9	355
Railroad	0–61	5.7	7.6	18.6	520.5	10.3	294.5	857
	61–120	2.2	10.4	24.7	187.5	5.5	151.2	381
Western Channel	0–40	0.8	4.2	23.6	125.8	15.6	77.1	247
Salty	0–20	0.3	1.6	23.9	180.2	3.8	80.0	290
North	0–40	0.5	3.4	25.2	169.9	8.8	78.5	286
South	0–40	4.5	4.2	21.8	83.4	2.3	95.1	211
Denuded Mound	0–40	0.1	0.5	10.2	73.4	1.5	34.2	120
Sedge Mound	0–40	0.3	0.5	2.3	21.9	1.7	10.6	37

 ^aAs_SUMSEQ=Assum(WS+EX+SS/CAR+OX+OM/S+RES).