Table 2 Test conditions of analysis the samples.
Characteristics | DOC | TN | Ammonia nitrogen | Nitrate nitrogen | Nitrite nitrogen | TP | Phosphate |
|---|---|---|---|---|---|---|---|
Test range | 550Â nm | 550Â nm | 660Â nm | 550Â nm | 550Â nm | 880Â nm | 880Â nm |
Test range (mg/L) | 0–10 | 0–2 | 0–10 | 0–5 | 0–5 | 0–5 | 0–6 |
Sampling rate | 30/h | 40/h | 60/h | 50/h | 50/h | 30/h | 60/h |
Sample: Wash ratio | 3:1 | 4:1 | 4:1 | 5:1 | 5:1 | 3:1 | 3:01 |
Reagent absorbance | 0.5–0.8 | 0.03–0.06 | 0.01–0.02 | 0–0.48 | 0–0.58 | 0.01–0.02 | 0.50–0.60 |
Sensitivity at 10 mg/L C | 0.2–0.4 | 0.09–0.11 | 0.23–0.27 | 0–0.01 | 0–0.01 | 0.09–0.11 | 0.01–0.02 |
Coefficient of variation1 | < 0.8% | 1.6% | 0.2% | 0.6% | 0.2% | 0.3% | 0.30% |
Pooled standard deviation (mg/L) | 0.03 | 0.1 | 0.013 | 0.015 | 0.01 | 0.01 | 0.15 |
Correlation coefficient2 | 0.9990 | 0.9998 | 0.9990 | 1.0000 | 0.9990 | 0.9999 | 0.999 |
Detection limit3 (mg/L) | 0.8 | 0.02 | 0.003 | 0.017 | 0.002 | 0.009 | 0.01 |
