| Method 1 (gas phase) | Method 2 (liquid phase) |
|---|---|
| Chemiluminescence | NO electrodes |
| Laser-based photoacoustic detection | Indirect chemiluminescence |
| Quantum cascade laser | Electron spin resonance |
| Membrane inlet mass spectrometry | Oxyhemoglobin assay |
| Griess reagent assay | |
| Fluorescent based dyes |
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