Table 14.

Gas trapping efficiencies of the SRC filter

Compound	Integration range (cm−1)	Filter efficiency (%)
Ethanol	3534–3345	99.37
Benzene (4 bands)	3110–2998	>94
Hexane+ethanol+acetone	2999–2845	>98.5
CO	2157–2129	84
Benzene	1988–1960	>90
Benzene	1843–1813	>99.2
Acetone	1731–1698	99.05
Benzene	1488–1477	98
Mostly ethanol	1477–1407	99.4
Hexane+ethanol+acetone	1397–1348	99.27
Hexane+ethanol+acetone	1266–1216	99.4
Ethanol+acetone+benzene	1106–1024	98.7
Acetone+ethanol	898–873	>98
Hexane	739–722	>95
Benzene	701–676	>97.1

Note—both spectra show bands near 2350 and 663 cm⁻¹ due to CO₂ and in the 3730–3570 cm⁻¹ 1640–1590 cm⁻¹ regions due to H₂O. These gases were not part of the original gas mixture and are likely contaminants associated with gases already trapped in the filter due to prior exposure to atmosphere, and the cryo-vacuum system used to condense the gases for FTIR measurement