An Optimized Adsorbent Sampling Combined to Thermal Desorption GC-MS Method for Trimethylsilanol in Industrial Environments

Table 2

Results of retainability tests. Front, Back1, and Back2 were the front, 1st backup and 2nd backup tubes in series. Amounts of TMSOH in three tubes were expressed as the percentages of the initial amount spiked to the front tube.

Amount (ng)	Vol (L)	Flow matrix^a	Dual-bed tubes			Single-bed tubes
			Front (%)	Back1 (%)	Back2 (%)	Front (%)	Back1 (%)	Back2 (%)
10	1	N2	98.2	1.1	0.7	91.6	4.4	3.9
10	5	N2	96.0	0.7	3.3	66.6	28.7	4.8
10	10	N2	99.4	0.4	0.2	78.7	20.8	0.5
10	20	N2	97.8	1.0	1.2	68.5	27.1	4.5
200	1	N2	99.5	0.5	0.1	94.3	5.7	0.0
200	5	N2	98.9	0.3	0.8	24.6	34.0	41.4
200	10	N2	97.8	1.1	1.2	18.4	35.0	46.7
200	20	N2	99.5	0.4	0.1	23.0	38.5	38.5
200	20	Air	99.7	0.3	n.a.	35.8	64.2	n.a.
200	20	Air	98.4	1.6	n.a.	40.9	59.1	n.a.

Notes: ^aFlow matrix: the gas blown through tubes in retainability tests. n.a.: not available.