Concentration Variability of Halocarbons

over an Electronics Industrial Park and Its Implication in Compliance with

the Montreal ProtocolENVIRONMENTAL SCIENCE & TECHNOLOGY VOL. 35, NO. 16, 2001

Speaker: Ann

http://www.esrl.noaa.gov/news/2007/ozone2007.html

Ozone hole

Target compounds

CFC-113 、 CCl4 、 CFC-12 、 CFC-11 、 CH3CCl3 、

C2HCl3 、 C2Cl4

RCl + hv → R + Cl

Cl + O3→ ClO + O2

ClO + O → Cl + O2

Net reaction ： O3 + O → 2O2

Sampling locations

Instruments

☆ In-situ (2000) - Park ： GC / ECD

☆ Flask (2000) - Park ： GC / MS

☆ Flask (1997) - Park ： GC / ECD

☆ Flask (1997) - Coastal ： GC / ECD

☆ Column ： DB-1 ( 60 m X 0.32 mm X 1.0 μm )

In-situ chromatogram

Concentration distributionIn July 2000 (Flask)

In March 1997 (Flask)

Concentration variability

Relative concentration variation

Relative concentration variation

Relative concentration variation

Concentration v.s wind direction

0 °

90 °

180 °

270 °

Concentration v.s wind direction

CCl4 CFC-113

CFC-12 CFC-11

Concentration vs. wind direction

CH3CCl3

C2HCl3 C2Cl4

Conclusions

☆The in-situ measurement method can be more precisely recorded and better rationalized than the flask measurement method.

☆ The minor emissions of CFC-113 and CCl4 detected by the in-situ method combining with wind data suggest that good compliance with the Montreal Protocol.

Thank you for your attention