Table 1.
Comparison of urinary concentrations (ng/mL) of volatile organic compound metabolites (VOCMs) at baseline (Day 0) and day 240 at three storage temperatures. RT= room temperature (22° C). < LOD: below limit of detection.
| Parent VOC | VOCM | Volunteer 1 | Volunteer 2 | Volunteer 3 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Baseline conc. (day 0) | Conc. on day 240 at RT | Conc. on day 240 at 4° C | Conc. on day 240 at −20° C | Baseline conc(day 0) | Conc. on day 240 at RT | Conc. on day 240 at 4° C | Conc. on day 240 at −20° C | Baseline conc (day 0) | Conc. on day 240 at RT | Conc. on day 240 at 4° C | Conc. on day 240 at −20° C | ||
| Acrolein | CEMA | 21.3 | < LOD | < LOD | < LOD | 232 | 294 | 195 | 143 | 67.8 | < LOD | < LOD | < LOD |
| Acrolein | 3HPMA | 187 | 34.7 | 20.6 | 22.7 | 686 | 149 | 126 | 130 | 126 | 22.9 | 11.6 | 6.52 |
| Propylene oxide | 2HPMA | 73.5 | 46.8 | 70.7 | 50.2 | 259 | 230 | 219 | 197 | 48.7 | 40.0 | 50.5 | 33.1 |
| Toluene | SBMA | 2.09 | < LOD | 0.902 | 0.656 | 11.4 | 9.56 | 8.66 | 7.05 | 2.06 | < LOD | 0.904 | 0.207 |
| Acrylamide | AAMA | 30.6 | < LOD | 12.7 | 8.87 | 145 | 84.3 | 88.4 | 58.4 | 11.3 | 0.433 | 5.85 | 0.370 |
| Acrylamide | GAMA | 9.33 | 39.6 | 3.85 | 1.13 | 42.3 | 15.7 | 119.0 | 69.3 | 1.92 | < LOD | < LOD | < LOD |
| Acrylonitrile | CYMA | 4.73 | 4.86 | 3.54 | 1.82 | 3.74 | 2.08 | 6.63 | 2.11 | 1.91 | < LOD | < LOD | < LOD |
| Xylene | 2MHA | 45.4 | 61.6 | 63.4 | 31.1 | 30.7 | 30.4 | 63.8 | 42.0 | 4.42 | 14.6 | 16.5 | 11.7 |
| Xylene | 3+4 MHA | 56.2 | 37.2 | 31.3 | 18.1 | 69.1 | 23.2 | 54.4 | 20.4 | 9.49 | 22.2 | 11.4 | 13.8 |
| 1,3-Butadiene | DHBMA | 345 | < LOD | 101 | 43.8 | 599 | 343 | 221 | 277 | 68.85 | <LOD | 11.0 | <LOD |
| 1,3-Butadiene | MHBMA 1+2+3 | 24.0 | 9.50 | 13.4 | 11.5 | 126 | 141 | 173 | 99 | 6.40 | 8.46 | 8.98 | 2.81 |
| Crotonaldehyde | CMEMA | 601 | 1.95 | 301 | 186 | 2010 | 1325 | 1450 | 1030 | 158 | 33.7 | 84.7 | 19.7 |
| N,N-Dimethylforma mide | AMCC | 50.4 | < LOD | 48.8 | 21.0 | 154 | < LOD | < LOD | < LOD | 16.9 | < LOD | < LOD | < LOD |
| 1-Bromopropane | BPMA | 8.07 | < LOD | 3.55 | 2.07 | 259 | 23.9 | 50.5 | 61.9 | < LOD | < LOD | < LOD | < LOD |
| Carbon disulfide | TTCA | 376 | < LOD | 209 | 122 | 1230 | 1410 | 20.8 | 153 | 79.6 | 18.0 | 35.7 | 6.50 |
| Tetrachloroethylene | TCVMA | 19.3 | < LOD | 3.65 | 1.34 | 19.7 | 5.18 | 5.34 | 3.3 | 3.68 | < LOD | < LOD | < LOD |
| Methylating agents | MMA | 20.5 | < LOD | < LOD | 2.5 | 13.0 | 15.0 | 1.72 | 2.79 | < LOD | < LOD | < LOD | < LOD |
| Crotonaldehyde | HPMMA | 98.5 | < LOD | 59.6 | 28.1 | 322 | 280 | 334 | 232 | 53.8 | < LOD | 15.5 | < LOD |
| ∑VOCM | 1970 | 234 | 947 | 552 | 6210 | 4380 | 3140 | 2530 | 660 | 126 | 253 | 94.7 | |
38 VOCM metabolites were analyzed. The table presents only those that were found in samples. AAMA-Sul, CMEMA, HEMA, 1,2- & 2,2-DCVMA, 2,4-, 2,5- & 3,4-DPMA, ATCA, PGA, 1,2- & 2,2-PHEMA, MA, SPMA, MU, EMA, NANPC, and IPM 1 & IPM 3 were not detected in any of the urine samples. Samples stored at 4°C and −20°C endred 18 freeze-thaw cycles.