1. Journal of Chromatography A, 896 (2000) 31-39
Cryogen free automated gas chromatography for the measurement of ambient volatile organic compounds
Journal of Chromatography A, 896 (2000) 31-39
Jia-Lin Wang*, Wei-Li Chen, Yen-Hung Lin, Cheng-Hsiung Tsai

6. experimental HP6890-Dual traps, FID
PLOT for C3-C7 30m × 0.32mm ; 8 μm.
DB-1 for C6-C12 60m × 0.32mm ; 1 μm.
Uncoated column 5 m × 0.25 mm

8. C3-C7 NMHCs in Taiwan EPA monitoring station
1th
250th
673th

9. preconcentration system

10. Minimizing longitudinal diffusion
0.5mm ID × 1.6mm
Non- Cooling GC oven
0.5mm ID × 1.6mm
Cooling GC oven

11. 0.5mm ID × 1.6mm
Cooling GC oven
0.25mm ID × 0.8mm
Non-Cooling GC oven

12. Reproducibility

13. Linearity Propane from PLOT column Flow rate = 50ml / min
Benzne from PLOT column
Flow rate = 50ml / min

14. (a) CO by NDIR
(b) Benzene by automated system

15. R2> 0.92
R2> 0.25

16. conclusion
This work was to build an automated GC system for measuring VOCs either in the lab or the field without using cryogen in preconcentration and column separation.
Two traps were coupled to their designated columns to form suitable pairs to provide adequate resolution without cryogen use.