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Nitrate characteristics for long-term monitoring sites in large rivers.
| River | Length | Basin Area | Mean- [NO3 −–N] | Mean-δ15Nnitrate | Mean-δ18Onitrate | Sample Number |
|---|---|---|---|---|---|---|
| km | 105 km2 | mg/L | ‰ | ‰ | ||
| Mississippi River42 | 6020 | 32.2 | 1.45 ± 0.5 | 7.7 ± 0.3 | 4.6 ± 0.3 | 22 |
| Yellow River | 5465 | 7.95 | 3.4 ± 0.86 | 8.4 ± 1.1 | 1.2 ± 1.3 | 25 |
| Saint Lawrence River41 | 1287 | 3.00 | 0.43 ± 0.08 | 5.7 ± 0.7 | 5.4 ± 1.4 | 41 |
| Rhine River9 | 1320 | 1.85 | 2.7 ± 0.7 | 8.2 | 0.4 | 24 |
| Elbe River9 | 1165 | 1.48 | 2.6 ± 1.4 | 8.5 | 1.3 | 16 |
