| Sample | Ca | Na | Mn | Fe | Ni | Cd | Ag | Pb | Cr |
| W1 | 2.93 ± 0.32 | 1.79 ± 0.10 | 0.01 ± 0.01 | 0.14 ± 0.04 | 0.02 ± 0.00 | BDL | BDL | 0.01 ± 0.00 | 0.13 ± 0.00 |
| W2 | 7.41 ± 1.22 | 2.6 ± 0.89 | 0.01 ± 0.00 | 0.05 ± 0.01 | 0.01 ± 0.00 | BDL | 0.01 ± 0.00 | BDL | 0.07 ± 0.00 |
| W3 | 3.05 ± 0.87 | 2.08 ± 1.10 | BDL | BDL | BDL | BDL | BDL | 0.01 ± 0.00 | 0.02 ± 0.00 |
| W4 | 2.98 ± 0.19 | 1.97 ± 0.34 | 0.01 ± 0.00 | 0.18 ± 0.02 | 0.01 ± 0.01 | BDL | BDL | 0.01 ± 0.01 | 0.05 ± 0.04 |
| W5 | 5.39 ± 0.54 | 2.67 ± 0.78 | 0.03 ± 0.03 | 1.72 ± 0.64 | 0.01 ± 0.01 | BDL | BDL | 0.01 ± 0.00 | 0.01 ± 0.00 |
| W6 | 1.4 ± 0.42 | 2.08 ± 1.36 | 0.05 ± 0.04 | 0.01 ± 0.01 | 0.02 ± 0.01 | BDL | 0.01 ± 0.00 | BDL | 0.01 ± 0.00 |
| W7 | 3.39 ± 1.30 | 2.2 ± 0.57 | 0.03 ± 0.01 | 0.97 ± 0.45 | 0.01 ± 0.01 | BDL | BDL | 0.01 ± 0.01 | 0.1 ± 0.00 |
| W8 | 1.99 ± 0.57 | 2.29 ± 0.63 | 0.06 ± 0.04 | 0.07 ± 0.01 | 0.02 ± 0.00 | BDL | BDL | 0.01 ± 0.00 | 0.06 ± 0.05 |
| W9 | 1.7 ± 0.49 | 3.09 ± 1.12 | 0.01 ± 0.01 | 0.04 ± 0.00 | 0.01 ± 0.01 | 0.01 ± 0.01 | BDL | BDL | BDL |
| W10 | 1.43 ± 0.33 | 2.28 ±0.28 | 0.00 ± 0.00 | 0.01 ± 0.00 | 0.01 ± 0.00 | 0.01 ± 0.01 | 0.01 ± 0.00 | BDL | BDL |
| W11 | 2.46 ± 0.79 | 2.03 ± 0.99 | 0.03 ± 0.01 | 0.2 ± 0.01 | 0.01 ± 0.00 | 0.01 ± 0.00 | BDL | 0.03 ± 0.00 | 0.01 ± 0.00 |
| W12 | 1.81 ± 0.68 | 2.07 ± 0.73 | BDL | 0.02 ± 0.00 | 0.01 ± 0.00 | 0.01 ± 0.01 | BDL | BDL | BDL |
| W13 | 2.07 ± 0.26 | 2.05 ± 0.24 | BDL | 0.01 ± 0.01 | 0.01 ± 0.00 | 0.01 ± 0.01 | 0.01 ± 0.00 | BDL | 0.01 ± 0.00 |
| W14 | 3.26 ± 0.19 | 3.59 ± 0.58 | 0.02 ± 0.00 | 0.02 ± 0.00 | 0.02 ± 0.01 | 0.01 ± 0.01 | BDL | BDL | BDL |
| W15 | 5.04 ± 0.95 | 1.63 ± 0.41 | 0.04 ± 0.01 | 1.4 ± 0.08 | 0.01 ± 0.01 | BDL | BDL | 0.01 ± 0.00 | 0.04 ± 0.00 |
| W16 | 2.75 ± 0.69 | 2.40 ± 0.44 | 0.02 ± 0.00 | 0.51 ± 0.12 | 0.02 ± 0.01 | BDL | 0.01 ± 0.00 | 0.01 ± 0.00 | 0.03 ± 0.02 |
| W17 | 1.93 ± 0.07 | 1.69 ± 0.17 | 0.01 ± 0.01 | 0.01 ± 0.00 | 0.01 ± 0.00 | BDL | 0.01 ± 0.01 | 0.01 ± 0.01 | 0.01 ± 0.00 |
| W18 | 2.04 ± 0.50 | 2.31 ± 0.41 | 0.02 ± 0.00 | 0.05 ± 0.00 | 0.01 ± 0.00 | 0.01 ± 0.01 | BDL | 0.01 ± 0.01 | BDL |
| W19 | 2.33 ± 0.09 | 2.23 ± 0.66 | 0.01 ± 0.00 | 0.01 ± 0.01 | 0.01 ± 0.01 | BDL | BDL | BDL | BDL |
| W20 | 2.71 ± 0.46 | 2.43 ± 1.19 | 0.03 ± 0.02 | BDL | 0.01 ± 0.01 | BDL | 0.01 ± 0.01 | BDL | 0.02 ± 0.01 |
| Control 1 | 0.63 ± 0.03 | 2.19 ± 0.95 | BDL | 0.02 ± 0.01 | 0.02 ± 0.00 | BDL | BDL | BDL | 0.01 ± 0.00 |
| Control 2 | 0.14 ± 0.07 | 0.78 ± 0.34 | 0.01 ± 0.01 | BDL | 0.01 ± 0.00 | BDL | 0.01 ± 0.00 | 0.01 ± 0.00 | 0.01 ± 0.00 |
| WHO PL | 100 | 200 | 0.4 | 0.3 | 0.07 | 0.003 | 0.1 | 0.01 | 0.05 |
| PL Source | WHO, 2011 | WHO, 2017 | WHO, 2017 | WHO, 2017 | WHO, 2017 | WHO, 2017 | WHO, 2020 | WHO, 2017 | WHO, 2017 |