Table 3. Statistical Analysis.
t-Test to determine significant differences between the VOC sensor and reference methods
| Validation Test | VOC Sensora | Reference Method | t-test | Significant Difference (p = 0.05) |
|---|---|---|---|---|
| SIFT - MS | ||||
| Sample 1 (n=3) | 195 | 177 | -1.247 | NO |
| Sample 2 (n=3) | 264 | 259 | -0.346 | NO |
| Sample 3 (n=3) | 371 | 382 | 0.762 | NO |
| Sample 4 (n=3) | 535 | 585 | 1.575 | NO |
| GC-FID | ||||
| Sample 1 (n=3) | 22 | 19.4 | -1.098 | NO |
| Sample 2 (n=3) | 10.8 | 13.6 | 1.183 | NO |
| Sample 3 (n=2) | 12.5 | 13.6 | 1.296 | NO |
a
concentration of VOC in ppb xylenes for SIFT-MS (Selected ion flow – mass spectrometry), and ppbC for GC-FID (Gas chromatography – flame ionization detection), AQDX method; n: number of readings per sample.