Retention times (min), milligrams of injected VOC, milligrams of VOC in the back tube.

VOC	RT (min)	Injected VOC (mg)	VOC in back tubea (mg)
4@1	13.7	1.226	0.502 ± 0.025
4@2	13.7	1.226	0.441 ± 0.023
4@3	13.7	1.226	0.429 ± 0.020
5@1	17.5	1.214	0.461 ± 0.023
5@2	17.5	1.214	0.387 ± 0.020
5@3	17.5	1.214	0.290 ± 0.014
6@1	20.7	1.212	0.379 ± 0.019
6@2	20.7	1.212	0.315 ± 0.016
6@3	20.7	1.212	0.303 ± 0.015
7@1	23.7	1.207	0.362 ± 0.018
7@2	23.7	1.207	0.265 ± 0.013
7@3	23.7	1.207	0.277 ± 0.013
8@1	26.8	0.120	0.349 ± 0.017
8@2	26.8	0.120	0.241 ± 0.012
8@3	26.8	0.120	0.134 ± 0.007
9@1	9.7	0.130	—b
9@2	9.7	0.130	—b
9@3	9.7	0.130	—b
10@1	12.2	0.126	0.416 ± 0.021
10@2	12.2	0.126	0.391 ± 0.019
10@3	12.2	0.126	0.467 ± 0.023
11@1	15.5	0.124	0.369 ± 0.018
11@2	15.5	0.124	0.311 ± 0.015
11@3	15.5	0.124	0.219 ± 0.011
12@1	18.7	0.123	0.309 ± 0.015
12@2	18.7	0.123	0.235 ± 0.012
12@3	18.7	0.123	0.173 ± 0.009

^aData from three independent experiments.

^bCalibration plots are not reproducible likely due to the low adsorption of this particular VOC.