Research Article
Trace Element Concentration and Speciation in Selected Mining-Contaminated Soils and Water in Willow Creek Floodplain, Colorado
Table 6
Selected chemical and physical properties of study soils.
| Soil | Depth | ECa | pH | CEC-7b | Base Sat.c | Total C | Total N | Total S | Bray P-1 | | |
Mnd | Sand | Silt | Clay | >2-mm fraction | (cm) | dS/m | | (cmol/kg) | (%) | % | mg/kg | % | % | (%) |
| Gravelbar | 0–73 | –f | 6.8 | 6.9 | 86 | 0.47 | 0.060 | 0.04 | 22.5 | 1.1 | 0.04 | 0.2 | 91.9 | 5.0 | 3.1 | 65 | Cottonwood | 0–90 | – | 5.4 | 15.2 | 47 | 1.19 | 0.134 | 0.04 | 21.4 | 1.0 | 0.07 | tr | 69.0 | 18.3 | 12.7 | 19 | Spruce | 0–10 | – | 6.4 | 12.9 | 85 | 2.05 | 0.308 | 0.14 | 23.9 | 1.3 | 0.07 | 0.1 | 73.1 | 17.0 | 9.9 | 24 | | 10–40 | – | 6.7 | 6.8 | 97 | 0.43 | 0.708 | 0.10 | 30.8 | 1.3 | 0.04 | 0.1 | 88.7 | 6.4 | 4.9 | 63 | Railroad | 0–61 | – | 5.9 | 7.0 | 19 | 0.52 | 0.035 | 0.22 | 13.9 | 1.6 | 0.05 | 0.1 | 80.3 | 13.8 | 5.9 | 59 | | 61–120 | – | 4.9 | 5.3 | 42 | 0.23 | 0.040 | 0.13 | 21.0 | 1.4 | 0.03 | 0.2 | 89.6 | 6.8 | 3.6 | 66 | Western Channel | 0–40 | – | 6.4 | 6.2 | 84 | 0.41 | 0.139 | 0.17 | 23.9 | 0.9 | 0.03 | 0.1 | 89.5 | 5.9 | 4.6 | 70 | Salty | 0–20 | 8.00 | 5.7 | 22.4 | 29 | 2.76 | 0.229 | 0.28 | – | 1.3 | 0.09 | 0.1 | 51.4 | 32.5 | 16.1 | 1 | North | 0–40 | – | 6.2 | 7.1 | 100 | 0.50 | 0.063 | 0.19 | 10.1 | 1.3 | 0.07 | 0.2 | 87.0 | 7.8 | 5.2 | 73 | South | 0–40 | – | 6.1 | 6.0 | 57 | 0.27 | 0.034 | 0.08 | 9.6 | 1.4 | 0.03 | 0.1 | 93.4 | 3.6 | 3.0 | 47 | Denuded Mound | 0–40 | – | 4.6 | 16.1 | 34 | 1.33 | 0.185 | 0.23 | 17.0 | 1.2 | 0.08 | tr | 55.8 | 28.5 | 15.7 | 3 | Sedge Mound | 0–40 | – | 5.6 | 23.1 | 100 | 2.43 | 0.246 | 0.13 | 26.3 | 1.0 | 0.07 | tr | 50.8 | 30.0 | 19.2 | 4 |
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ECa = electrical conductivity, saturated paste extract. CEC-7b= cation exchange capacity by NH4OAc, pH 7. Base Sat.c= base saturation by NH4OAc, pH 7. = dithionite-citrate extractable iron. = ammonium oxalate extractable aluminum. –f = concentration below detection limits.
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