Table 2.
Metal concentration (mg/kg) in sediment samples with grain size < 63 μm for tributaries of Rejo subbasin with median, mean, standard deviation and skew for R1, R2, and R3 (mainstream points), threshold effect level (TEL), and probable below level (PEL).
| R1 | R2 | R3 | R4 | Mediana | Meana | SDa | Skewa | TEL | PEL | |
|---|---|---|---|---|---|---|---|---|---|---|
| pH | —c | — | — | — | — | — | — | — | — | — |
| ECb | 37 | — | 32 | — | 34.5 | 34.5 | — | — | — | — |
| AI | 15605 | 13574.6 | 9601.9 | 14330.4 | 13575 | 12927 | 3053.5 | −0.9 | — | — |
| As | 55.93 | 63.3 | 48.78 | 56.82 | 55.9 | 56 | 7.3 | 0.0 | 5.9 | 17 |
| Cd | 12.3 | 4.5 | 5.4 | 3.1 | 5.4 | 7.4 | 4.3 | 1.6 | 0.6 | 3.5 |
| Cr | 3.3 | 7.6 | 4.8 | 6.7 | 4.8 | 5.2 | 2.2 | 0.9 | 37.3 | 90 |
| Cu | 198 | 34.4 | 42.8 | 16.6 | 42.8 | 91.7 | 92.1 | 1.7 | 35.7 | 197 |
| Fe | 15360.1 | 16810.3 | 15261 | 14731.7 | 15360.1 | 15810 | 867.3 | 1.7 | — | — |
| Hg | 0.1 | 0.17 | 0.1 | 0.09 | 0.1 | 0.12 | 0.0 | 1.7 | 0.17 | 0.49 |
| Mn | 3711.8 | 878.6 | 932.2 | 349.9 | 932.2 | 1841 | 1620.5 | 1.7 | — | — |
| Ni | 12 | 11.8 | 7 | 6.4 | 11.8 | 10.3 | 2.8 | −1.7 | — | — |
| Pb | 92.6 | 54.7 | 40.5 | 47.9 | 54.7 | 62.6 | 26.9 | 1.2 | 35 | 91 |
| Sb | n.d.d | n.d. | n.d. | n.d. | — | — | — | — | — | — |
| Sn | 76.3 | 79.7 | 62.8 | 87.5 | 76.3 | 72.9 | 8.9 | −1.5 | — | — |
| Zn | 452.7 | 122.2 | 149.9 | 55.3 | 149.9 | 241.6 | 183.3 | 1.7 | 123 | 315 |
aCalculated for mainstream samples (R1, R2, R3); bOhms*1000; cno available; dno detectable (n.d.).