Open Access
Table 2.
Level of copper contamination
| Indicators | Quarters | |||
|---|---|---|---|---|
| I | II | III | IV | |
| Number of samples with a maximum copper content | 151 | 118 | 59 | 92 |
| of the total number of samples, % | 30.20 | 23.60 | 11.80 | 18.40 |
| Number of samples with a medium copper content | 239 | 233 | 170 | 257 |
| of the total number of samples, % | 47.80 | 46.60 | 34.00 | 51.40 |
| Number of samples with a minimum copper content | 110 | 149 | 271 | 151 |
| of the total number of samples, % | 22.00 | 29,80 | 54.20 | 30.20 |
| Copper standard | 1.00 | 1.00 | 1.00 | 1.00 |
| Average copper content | 0.15 | 0.20 | 0.10 | 0.10 |
| of the standard, % | 15.00 | 20.00 | 10.00 | 10.00 |
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