concentration variability of halocarbons over an electronics industrial park and its implication in...
TRANSCRIPT
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