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

experimentalHP6890-Dual traps, FID

PLOT for C3-C730m × 0.32mm ; 8 μm.

DB-1 for C6-C1260m × 0.32mm ; 1 μm.

Uncoated column 5 m × 0.25 mm

C3-C7 NMHCs in Taiwan EPA monitoring station

1th

250th

673th

preconcentration system

Minimizing longitudinal diffusion

0.5mm ID × 1.6mmNon- Cooling GC oven

0.5mm ID × 1.6mmCooling GC oven

0.5mm ID × 1.6mmCooling GC oven

0.25mm ID × 0.8mmNon-Cooling GC oven

Reproducibility

Propane from PLOT column

Flow rate = 50ml / min

Benzne from PLOT column

Flow rate = 50ml / min

Linearity

(a) CO by NDIR

(b) Benzene by automated system

R2> 0.92

R2> 0.25

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.