Novel preconcentration technique for on-line coupling to high-speed narrow-bore capillary gas chromatography: sample enrichment by equilibrium (ab)sorption

Methane preconcentration in a microtrap using multiwalled carbon nanotubes as sorbents

“…However, this is a challenging task because while the concentration of CO 2 is relatively high, the concentration of organic species such as CH 4 are relatively low (ppm to ppb), and some level of preconcentration is necessary * Corresponding author. for their monitoring, especially for on-line and field monitoring [5][6][7][8][9][10][11].…”

Automated sample preparation using in-tube solid-phase microextraction and its application – a review

“…Moreover, a new SPME-HPLC system known as in-tube SPME, was recently developed using an open tubular fused-silica capillary column as the SPME device instead of SPME fiber [7,9,10,11,12,19,25,26,27]. The technique using a GC capillary tube is also known as open-tubular trapping, and can be coupled on-line with GC [50,51,52,53]. Intube SPME is suitable for automation, and automated sample handling procedures not only shorten the total analysis time but also usually provide better accuracy and precision relative to manual techniques.…”

“…Although this approach may be referred to as an in-tube SPME, it is basically similar to the open-tubular trapping coupled on-line with GC [50,51,52,53]. The technique was evaluated using a mixture of BTEX (benzene, toluene, ethylbenzene, and xylenes) in water.…”

Rapid Preconcentration and Enrichment Techniques for the Analysis of Food Volatile. A Review

“…These traps were desorbed either by installing them in an electrically heated coiled stainless-steel tube (Burger and Munro, 1986) or more simply using two GC ovens (Blomberg and Roeraade, 1987), the first one for the trap and the second one for the analytical column. Tuan et al (1997) employed a commercially available capillary (5 m  530 mm  5 mm CP Sil-5 CB) to trap volatile organic compounds (VOCs) in air and to analyse them on-line, eliminating the need for a refocusing step by use of a new sample preconcentration technique. They exceeded the breakthrough volume in order to get a homogeneous dissolution of all volatiles along the trap (equilibrium absorption), thus providing the means for a homogenous desorption over time.…”