Open Access
Table 4.
Level of lead contamination
| Indicators | Quarters | |||
|---|---|---|---|---|
| I | II | III | IV | |
| 1 | 2 | 3 | 4 | 5 |
| Number of samples with a maximum lead content | 102 | 79 | 73 | 97 |
| of the total number of samples, % | 20.40 | 15.80 | 14.60 | 19.40 |
| Number of samples with a medium lead content | 289 | 272 | 216 | 268 |
| of the total number of samples, % | 57.80 | 54.40 | 43.20 | 53.60 |
| Number of samples with a minimum lead content | 109 | 149 | 211 | 135 |
| of the total number of samples, % | 21.80 | 29.80 | 42.20 | 27.00 |
| Lead standard | 0.10 | 0.10 | 0.10 | 0.10 |
| Average | lead | |||
| content | 0.004 | 0.006 | 0.0009 | 0.006 |
| of the standard, % | 4.00 | 6.00 | 0.90 | 6.00 |
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