The semi-volatile organic compounds(SVOCs) in air can be enriched by ionic liquids. However

during the study of air sample tubes

fog and black phenomenon often appeared in the sample tubes. At the same time

analysis process was disturbed by high background values and impurity peak. To investigate the reasons above

1-methyl acetate-3-methyl imidazolium bis(trifluoromethanesulfonyl) imides was used to improve the air-sample tubes and a series of experiments were designed. And on the basis of the ionic liquid sample tubes reuse

the sorbent tubes were desorbed at 220℃ and 50 ml He·min-1 for 15 min. The vapors from the primary desorption were collected at 0℃ in the cold trap without sorbent. The cold trap was flash heated to 280℃ at 40℃·s-1 (temperature of 250℃ for the valve

no inlet split or outlet split) and the vapors were transferred via the heated transfer line (250℃) to the GC. The GC temperature program was 100℃ (held for 1 min) then increased at 10℃·min-1 to 200℃ and finally increased at 5℃·min-1 to 250℃ (held for 4 min). When the mesh of stainless steel substituted for glass fiber

the data indicates the mesh gives the better result.