Open Access
Table 3.
Level of zinc contamination
| Indicators | Quarters | |||
|---|---|---|---|---|
| I | II | III | IV | |
| Number of samples with a maximum zinc content | 89 | 83 | 21 | 117 |
| of the total number of samples, % | 17.80 | 16.60 | 4.20 | 23.40 |
| Number of samples with a medium zinc content | 272 | 259 | 176 | 243 |
| of the total number of samples, % | 54.40 | 51.80 | 35.20 | 48.60 |
| Number of samples with a minimum zinc content | 139 | 158 | 303 | 140 |
| of the total number of samples, % | 27.80 | 31.60 | 60.60 | 28.00 |
| Zinc standard | 5.00 | 5,00 | 5.00 | 5.00 |
| Average zinc content | 4.20 | 3.30 | 1.90 | 2.80 |
| of the standard, % | 84.00 | 66.00 | 38.00 | 56.00 |
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