I | II | III | IV | V | |
TN | R < 5 | 5 < R < 10 | 10 < R < 15 | 15 < R < 20 | R > 20 |
TP | R < 0.5 | 0.5 < R < 1 | 1 < R < 2 | 2 < R < 3.5 | R > 3.5 |
COD | R < 40 | 40 < R < 70 | 70 < R < 100 | 100 < R < 140 | R > 140 |
等标指数 | R < 5 | 5 < R < 15 | 15 < R < 30 | 30 < R < 45 | R > 45 |
硝态氮 | R < 2 | 2 < R < 5 | 2 < R < 20 | 20 < R < 30 | R > 30 |