Site Description

October 18 to November 5, 2004 for continuous hourly measurements.

October 16 to November 11, 2004 for 24 flask samples collecting.

Instrumentation

Dual sorbent trap, dual column,

dual detector (FID), Agilent 6890 GC

Dual sorbent trap, dual column,

dual detector (FID), Agilent 6890 GC

SystemSystem

PLOT : Al2O3/KCl(30m x 0.32mm, df=8µm)

DB-1 (J&W, USA)

PLOT : Al2O3/KCl(30m x 0.32mm, df=8µm)

DB-1 (J&W, USA)

ColumnColumn

Calibration was performed before

and after the campaign by 50 species.

Calibration was performed before

and after the campaign by 50 species.

CalibrationCalibration

Result and Discussion

VOC Comparison and LPG car exhaust

LPG alkane:propane

iso-butanen-butane

In-situ : 24%Canister : 27%

R2 = 0.9High coherence

In Taipei, RIn Taipei, R22 = 0.3 = 0.3

RR22 = 0.9 = 0.9

Effect of LPG vehicles on OFP

LPG is a better choice LPG is a better choice

of fuel than gasoline becauseof fuel than gasoline because

of its low OFP.of its low OFP.

Conclusion

LPG is the major source of VOC in downtown Guangzhou.

The synchronicity of LPG alkanes

with NO and propylene suggest

LPG linked to vehicular exhaust.

The LPG alkanes accounts for 24% of TVOC in Guangzhou,

its contribution to OFP only 7%.

LPG emissions are increasing in morning and evening rush hlurs, as well the nootime break.