Table 3.
Nitrite concentration of samples 1–7 and their corresponding gray intensity.
| Sample | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|---|---|---|---|---|---|---|---|
| Gray intensity | 82 | 77 | 73 | 67 | 64 | 59 | 55 |
| Nitrite concentration, mg/L | 10 | 8 | 6 | 4 | 3 | 2 | 1 |
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