| Technique | NITRITE REDUCTION ,(/,)/,( | 
| Principle | Some bacteria, incapable of reducing
        nitrate, can reduce nitrite. See nitrate reduction | 
| Cautions | |
| Method | Nitrite broth (0.01%) is inoculated with the microbe and after a suitable incubation period the broth is tested for residual nitrite. | 
| Results | |
| Positive control | |
| Negative control | |
| Reagents | |
| Reference |