Table 1.
Analysis of metal contents in PSOE.
| Metal | Concentration (mg/kg) |
|---|---|
| Na | 2.92 |
| K | 220 |
| Ca2+ | 8.60 |
| Fe | 0.26 |
| Zn | 0.39 |
| Cd | Not detected |
| Pb | Not detected |
| Al | Not detected |
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