Table 2.
The lowest mass of explosives detected in each replicate measurement from various surfaces. Key: N/D = not detected.
| Lowest detected mass (ng) | |||||
|---|---|---|---|---|---|
| Tsai et al. [33], recovery from glass slide |
This work, recovery from glass slide |
Clean keyboard |
Used keyboard |
||
| Paper spray | Paper Spray | Swab Spray | Swab Spray | Swab Spray | |
| TNT | 800 | N/D | N/D | ND | Partial at 25 |
| RDX | 100 | 25 | 10 | 10 | 10 |
| HMX | 600 | 25 | 10 | Partial at 10 | 10 |
| PETN | 100 | 25 | 10 | Partial at 10 | 10 |
| Tetryl | – | 25 | 10 | Partial at 10 | 10 |
| NG | – | N/D | N/D | ND | 25 |
| PA | – | 10 | 10 | 10 | 10 |