epa precursor gas training workshop pm 2.5 chemical speciation network (csn) carbon conversion joann...
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![Page 1: EPA Precursor Gas Training Workshop PM 2.5 Chemical Speciation Network (CSN) Carbon Conversion Joann Rice](https://reader030.vdocuments.us/reader030/viewer/2022032518/56649cc35503460f9498b96c/html5/thumbnails/1.jpg)
EPA Precursor Gas Training Workshop
PM2.5 Chemical Speciation Network (CSN) Carbon Conversion
Joann Rice
![Page 2: EPA Precursor Gas Training Workshop PM 2.5 Chemical Speciation Network (CSN) Carbon Conversion Joann Rice](https://reader030.vdocuments.us/reader030/viewer/2022032518/56649cc35503460f9498b96c/html5/thumbnails/2.jpg)
EPA Precursor Gas Training Workshop
PM2.5 Speciation Carbon Conversion
• PM2.5 Chemical Speciation Network (CSN):– Speciation Trends Network (STN)
• 54 Trends sites: Largely static urban monitoring stations and protocols for sampling and analysis
– State and Local Air Monitoring Stations (SLAMS)• Currently ~150 sites: monitors for state and local agency
directed monitoring objectives
• Changes in the network to address inconsistencies in carbon sampling and analysis procedures used in urban CSN and rural IMPROVE programs– Field blank collection and subtraction also changing
![Page 3: EPA Precursor Gas Training Workshop PM 2.5 Chemical Speciation Network (CSN) Carbon Conversion Joann Rice](https://reader030.vdocuments.us/reader030/viewer/2022032518/56649cc35503460f9498b96c/html5/thumbnails/3.jpg)
EPA Precursor Gas Training Workshop
Carbon Data Comparability Issues
• A Brief History…– Factor of 2 difference in Elemental Carbon (EC) highlighted
by Chow et al., 2001*– Data users comparing urban (speciation) and rural
(IMPROVE) monitoring data for modeling, air quality data analyses, control strategy development, …
– Question posed to CASAC on strengths and weaknesses of converting the network (December 2004)
– The CASAC subcommittee on monitoring strongly recommended changes to the network “to achieve fully comparable data”
– EPA/OAQPS began communicating plans for changes to carbon in late 2004
* Chow, J.C., Watson, J.G., Crow, D., Lowenthal, D.H., and Merrifield, T. (2001). Comparison of IMPROVE and NIOSH Carbon Measurements; Aerosol. Sci. and Tech. 34:23-34.
![Page 4: EPA Precursor Gas Training Workshop PM 2.5 Chemical Speciation Network (CSN) Carbon Conversion Joann Rice](https://reader030.vdocuments.us/reader030/viewer/2022032518/56649cc35503460f9498b96c/html5/thumbnails/4.jpg)
EPA Precursor Gas Training Workshop
• A Brief History…–15 City CSN-to-IMPROVE
comparison study• Preliminary data analysis from first 6 cities
– ORD/OAQPS analysis of first year data in 2003 and OAQPS reassessment of full data set in 2005
– Factor of 2 not observed for EC in urban locations; however, bigger differences found for EC in rural locations
– Significant differences in OC observed due to filter face velocity/flow rate
• Results from additional 9 sites not yet evaluated
Carbon Data Comparability Issues
![Page 5: EPA Precursor Gas Training Workshop PM 2.5 Chemical Speciation Network (CSN) Carbon Conversion Joann Rice](https://reader030.vdocuments.us/reader030/viewer/2022032518/56649cc35503460f9498b96c/html5/thumbnails/5.jpg)
EPA Precursor Gas Training Workshop
Organic Carbon Comparisonsite=Haynes Pt
IMPROVE STN IMPROVE STN IMPROVE STN IMPROVE STN
0
5
10
15
20
Con
cent
ratio
n
OC
Fall Spring Summer Winter
site=Dolly Sods
IMPROVE STN IMPROVE STN IMPROVE STN IMPROVE STN
0
1
2
3
4
5
6
7C
once
ntra
tion
OC
Fall Spring Summer Winter
parm=OC (Imp or STN)
PLOT Haines Point (urban) Haines Point Deming LineDolly Sods (rural) Dolly Sods Deming Line
IMP
RO
VE
0
5
10
15
20
STN
0 5 10 15 20
• Sampler and filter-face velocity effects due to flow differences
• IMPROVE ~22 LPM; and MetOne ~ 7 LPM
• IMPROVE OC un adjusted for blank
![Page 6: EPA Precursor Gas Training Workshop PM 2.5 Chemical Speciation Network (CSN) Carbon Conversion Joann Rice](https://reader030.vdocuments.us/reader030/viewer/2022032518/56649cc35503460f9498b96c/html5/thumbnails/6.jpg)
EPA Precursor Gas Training Workshop
Elemental Carbon Comparison
parm=EC (Imp or STN)
PLOT Beacon Hill (urban) Beacon Hill Deming LineMt. Ranier (rural) Mt. Ranier Deming Line
IMP
RO
VE
0
1
2
3
4
5
STN
0 1 2 3 4 5
site=Mt. Ranier
IMPROVE STN IMPROVE STN IMPROVE STN IMPROVE STN
0
0.2
0.4
0.6
0.8
1.0
Con
cent
ratio
n
EC
Fall Spring Summer Winter
• EC compares better in urban areas, but large amount of scatter
• Rural EC at lower concentrations <0.3 µg/m3
site=Beacon Hill
IMPROVE STN IMPROVE STN IMPROVE STN IMPROVE STN
0
1
2
3
4
Con
cent
ratio
n
EC
Fall Spring Summer Winter
![Page 7: EPA Precursor Gas Training Workshop PM 2.5 Chemical Speciation Network (CSN) Carbon Conversion Joann Rice](https://reader030.vdocuments.us/reader030/viewer/2022032518/56649cc35503460f9498b96c/html5/thumbnails/7.jpg)
EPA Precursor Gas Training Workshop
Sampling and Analysis
• URG3000N Carbon Sampler– Identical to the IMPROVE sampler except:
• Mass flow control• Sampler operation and troubleshooting support provided by
URG• Modules loaded/provided by RTI
– Differs from CSN sampler• 22.8 LPM flow rate• 25-mm Pallflex Quartz filter
• Carbon Analysis– IMPROVE_A TOR method– Blank collection and subtraction
![Page 8: EPA Precursor Gas Training Workshop PM 2.5 Chemical Speciation Network (CSN) Carbon Conversion Joann Rice](https://reader030.vdocuments.us/reader030/viewer/2022032518/56649cc35503460f9498b96c/html5/thumbnails/8.jpg)
EPA Precursor Gas Training Workshop
PM2.5 Speciation Carbon Conversion
• EPA is using a contractor to procure, install and train operators on URG3000N sampler use
• The contractor coordinates installation with Region/State agencies
• Once installations are complete, new TOR analysis begins – All sites move to TOR at once– Concurrent CSN TOT and new sampling and TOR analysis
done for about two months
• Sampling modules, cassettes, and analysis will continue to be supported and supplied by RTI
• Repeat process for rest of the network in batches of 50-60
![Page 9: EPA Precursor Gas Training Workshop PM 2.5 Chemical Speciation Network (CSN) Carbon Conversion Joann Rice](https://reader030.vdocuments.us/reader030/viewer/2022032518/56649cc35503460f9498b96c/html5/thumbnails/9.jpg)
EPA Precursor Gas Training Workshop
Project Status
• Phase I completed May 2007– May 3rd start date
• Phase 2 site selection starting now– Expect fall 2007 installation start date
• URG3000N web page created– http://epa.gov/ttn/amtic/specurg3000.html
• Issues and Problems so far:– Few sites not prepared for installation (space and
power issues)– Handful of sampler startup issues– Some agencies without FTS to check 22 LPM– Lead time on parts/supplies from vendor
![Page 10: EPA Precursor Gas Training Workshop PM 2.5 Chemical Speciation Network (CSN) Carbon Conversion Joann Rice](https://reader030.vdocuments.us/reader030/viewer/2022032518/56649cc35503460f9498b96c/html5/thumbnails/10.jpg)
EPA Precursor Gas Training Workshop
Questions