Table 3 Geoaccumulation index (Igeo) values of elements in the sludge samples.
Bn (mg kg−1)* | Igeo (W1) | Igeo (W2) | Igeo (W3) | |
|---|---|---|---|---|
Al | 8.23E + 04 | −5.42E-01 | −4.40E-01 | −5.01E-01 |
Fe | 5.63E + 04 | −1.98E-01 | −3.26E-01 | −2.24E-01 |
P | 2.33E + 04 | −3.77E-01 | −3.16E-01 | 1.83E-02 |
Ca | 4.15E + 04 | −5.08E-01 | −7.24E-01 | −4.94E-01 |
K | 2.09E + 04 | −9.48E-01 | −8.37E-01 | −1.07E + 00 |
Mg | 1.05E + 03 | 5.28E-01 | 3.88E-01 | 4.00E-01 |
Na | 2.36E + 04 | −1.22E + 00 | −1.23E + 00 | −1.09E + 00 |
Mn | 9.50E + 02 | −3.56E-01 | −5.31E-01 | −6.73E-01 |
W | 1.90E + 00 | 1.64E + 00 | 3.11E + 00 | 2.61E + 00 |
Ti | 5.70E + 03 | −1.04E + 00 | −1.36E + 00 | −1.19E + 00 |
Ba | 6.28E + 02 | −3.95E-01 | −3.02E-01 | 3.39E-03 |
Sr | 3.20E + 02 | −4.21E-01 | −5.11E-01 | −3.59E-01 |
Zn | 6.70E + 01 | 6.66E-01 | 3.61E-01 | 1.35E + 00 |
Cu | 2.80E + 01 | 1.88E-01 | 5.85E-01 | 1.52E + 00 |
Sn | 2.10E + 00 | 1.65E + 00 | 1.84E + 00 | 2.10E + 00 |
Ni | 4.70E + 01 | −6.75E-01 | −1.14E-01 | 9.37E-01 |
Cr | 9.20E + 01 | −5.81E-01 | −1.62E-01 | 1.06E + 00 |
Ga | 1.75E + 01 | 1.07E-01 | 3.41E-01 | 4.84E-01 |
Pb | 1.70E + 01 | 2.25E-01 | 2.83E-01 | 3.96E-01 |
V | 9.70E + 01 | −9.75E-01 | −1.01E + 00 | −1.00E + 00 |
Co | 1.73E + 01 | −6.77E-01 | 2.73E-01 | 1.29E-01 |
As | 4.80E + 00 | −2.05E-01 | −2.59E-01 | −1.41E-01 |
Rb | 8.40E + 01 | −5.84E-01 | −3.86E-01 | −9.96E-01 |
Nb | 1.20E + 01 | −3.27E-01 | −5.95E-01 | −5.85E-01 |
Mo | 1.10E + 00 | 1.01E + 00 | 1.40E + 00 | 1.34E + 00 |
Cd | 9.00E-02 | 1.83E + 00 | 2.66E + 00 | 2.64E + 00 |
Sb | 4.00E-01 | 2.13E-01 | 2.58E-01 | 1.49E + 00 |
Hf | 5.30E + 00 | −4.67E-01 | −4.63E-01 | −2.17E-01 |
Re | 1.98E-01 | — | — | — |
Tl | 9.00E-01 | −6.16E-01 | −3.97E-01 | −5.80E-01 |
Pd | 5.40E-04 | 3.47E + 00 | 3.43E + 00 | 4.13E + 00 |
Ag | 5.30E-02 | 1.88E + 00 | 1.43E + 00 | 2.25E + 00 |
Au | 1.50E-03 | 2.73E + 00 | 2.78E + 00 | 3.40E + 00 |
Ru | 3.40E-04 | 2.14E + 00 | 1.98E + 00 | 2.33E + 00 |
Ir | 2.20E-05 | — | — | — |
Pt | 5.00E-04 | 1.54E + 00 | 1.48E + 00 | 1.46E + 00 |
Ce | 6.30E + 01 | −1.05E-01 | 6.67E-01 | 3.98E-01 |
Nd | 2.70E + 01 | −2.66E-02 | 8.43E-02 | 2.47E-01 |
La | 3.10E + 01 | −8.69E-02 | 7.38E-01 | 5.27E-01 |
Y | 2.10E + 01 | −1.13E-01 | 1.49E-02 | 6.30E-01 |
Pr | 7.10E + 00 | −1.02E-02 | 9.96E-02 | 3.18E-01 |
Sc | 1.40E + 01 | −1.00E + 00 | −7.34E-01 | — |
Sm | 4.70E + 00 | 1.22E-01 | 2.00E-01 | 4.07E-01 |
Gd | 4.00E + 00 | 2.46E-01 | 3.85E-01 | 3.04E-01 |
Dy | 3.90E + 00 | 3.67E-02 | 1.07E-01 | 1.50E-01 |
Er | 2.30E + 00 | −3.74E-02 | 6.71E-02 | 7.37E-02 |
Yb | 1.96E + 00 | 5.53E-03 | 1.18E-01 | 1.18E-01 |
Eu | 1.00E + 00 | 9.87E-02 | 1.83E-01 | 9.78E-01 |
Ho | 8.30E-01 | −4.47E-02 | 4.80E-02 | 4.64E-02 |
Tb | 7.00E-01 | 1.08E + 00 | 1.06E + 00 | 1.12E + 00 |
Tm | 3.00E-01 | −6.88E-03 | 1.07E-01 | 1.08E-01 |
Lu | 5.00E-01 | — | — | — |
