Table 3.
Descriptive statistics of the values of soil potentially toxic elements (0–0.2 m) in the municipality of Barcarena, Brazilian Amazon.
| As | Ba | Co | Cu | Cr | Hg | Ni | Pb | Zn | |
|---|---|---|---|---|---|---|---|---|---|
| mg kg−1 | |||||||||
| General | |||||||||
| Minimum | 0.00 | 0.00 | 0.00 | 0.00 | 3.12 | 0.11 | 0.00 | 1.49 | 1.49 |
| Maximum | 8.25 | 85.30 | 7.62 | 333.0 | 69.40 | 1.99 | 42.80 | 62.00 | 356.00 |
| Median | 1.91 | 4.63 | 1.30 | 14.70 | 13.90 | 0.58 | 1.90 | 2.65 | 7.90 |
| Average | 2.35 | 6.15 | 1.39 | 14.70 | 15.27 | 0.50 | 2.39 | 4.14 | 14.59 |
| Std.Dev. | 1.32 | 8.06 | 0.63 | 25.68 | 10.11 | 0.32 | 2.86 | 6.79 | 30.37 |
| Kurtosis | −0.794 | 0.638 | 9.079 | −0.194 | −0.369 | 4.202 | 12.025 | 3.767 | 1.235 |
| Skewness | 0.185 | 0.220 | 2.067 | 0.079 | 0.050 | 1.455 | 2.396 | 1.651 | −0.084 |
| Coef.Var. | 11.44 | 21.15 | 8.62 | 46.39 | 3.66 | 31.60 | 26.61 | 29.39 | 21.37 |
| p Valuea | >0.20 | >0.20 | <0.01 | <0.01 | >0.20 | <0.01 | <0.01 | <0.01 | >0.20 |
| Dump (n = 20) | |||||||||
| Minimum | 0.00 | 1.92 | 0.00 | 0.00 | 8.27 | 0.00 | 1.22 | 0.00 | 3.54 |
| Maximum | 8.25 | 66.20 | 2.32 | 148.0 | 69.4 | 0.12 | 42.80 | 62.00 | 356.0 |
| Median | 2.50 | 5.79 | 1.07 | 1.92 | 15.10 | 0.05 | 1.94 | 2.51 | 7.17 |
| Average | 2.79 | 11.39 | 0.78 | 16.85 | 23.94 | 0.04 | 4.42 | 8.30 | 38.63 |
| Refinery Area (n = 73) | |||||||||
| Minimum | 0.00 | 0.00 | 0.00 | 11.70 | 7.30 | 0.00 | 0.00 | 0.00 | 4.79 |
| Maximum | 2.3 | 12.2 | 1.90 | 46.40 | 32.00 | 0.13 | 5.10 | 7.4 | 47.40 |
| Median | 0.00 | 4.40 | 0.00 | 19.40 | 13.60 | 0.05 | 1.60 | 2.64 | 10.00 |
| Average | 0.095 | 4.99 | 0.42 | 20.80 | 15.35 | 0.04 | 1.69 | 2.87 | 12.30 |
| Bom Futuro (n = 33) | |||||||||
| Minimum | 0.00 | 2.11 | 0.00 | 0.00 | 7.82 | 0.00 | 0.00 | 0.00 | 2.96 |
| Maximum | 5.52 | 27.70 | 1.78 | 333.0 | 62.70 | 1.99 | 6.29 | 55.60 | 129 |
| Median | 1.12 | 5.20 | 0.00 | 2.04 | 11.60 | 0.05 | 1.60 | 2.17 | 6.35 |
| Average | 1.21 | 7.24 | 0.43 | 17.78 | 14.49 | 0.09 | 1.91 | 4.91 | 16.57 |
| Itupanema (n = 75) | |||||||||
| Minimum | 0.00 | 2.20 | 0.00 | 2.13 | 8.40 | 0.00 | 1.00 | 1.05 | 5.22 |
| Maximum | 5.49 | 41.20 | 1.92 | 91.2 | 60.00 | 0.31 | 9.80 | 60.00 | 167.0 |
| Median | 0.00 | 5.93 | 1.02 | 19.30 | 15.40 | 0.09 | 2.30 | 3.30 | 13.20 |
| Average | 0.98 | 7.96 | 0.71 | 18.87 | 18.50 | 0.10 | 2.56 | 5.90 | 19.38 |
| Burajuba (n = 73) | |||||||||
| Minimum | 0.00 | 1.00 | 0.00 | 0.00 | 7.57 | 0.00 | 0.00 | 0.00 | 1.49 |
| Maximum | 5.29 | 85.30 | 7.62 | 36.90 | 30.00 | 0.20 | 9.37 | 11.30 | 39.8 |
| Median | 0.00 | 3.06 | 0.00 | 2.74 | 15.60 | 0.06 | 1.50 | 1.90 | 6.85 |
| Average | 0.94 | 4.92 | 0.62 | 7.56 | 16.52 | 0.06 | 1.62 | 1.89 | 7.50 |
| Guide value** | 15 | 150 | 25 | 60 | 75 | 0.5 | 30 | 72 | 300 |
a
Kolmogorov-Smirnov indicates normal values when p values > 0.05. **CONAMA 420/2009 prevention values [35]. Values in bold are above prevention values.