| UPB | Urease-producing bacteria |
| Cd | Cadmium |
| Pb | Lead |
| Cu | Copper |
| Zn | Zinc |
| SEM-EDS | Scanning Electron Microscopy–Energy Dispersive Spectrometer |
| FTIR | Fourier Transform infrared spectroscopy |
| XRD | X-ray diffraction |
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