1. VOCs distribution and emission sources impact implication in an urban area in Yangtze River Delta
Jie Zhang, Qiuyue Zhao, Guofeng Shen
Jiangsu Provincial Academy of Environmental Science

2. Background Located in YRD Population: 7.6 million
Secondary industry: increases at 3%
Vehicle population:1 million
O3: exceeds standard ~10 days in July and August each
VOCs emission: 94 thousand tons in 2012, in which industrial and vehicular contributed 38% and 31%, respectively

3. Sampling setting Nantong Zilang Hongqiao Xinghu Site Function Date
Time
Hongqiao
Commercial
8:00, 10:00,
12:00,14:00,
16:00, 18:00
Xinghu
Industrial
8:00,11:00,
14:00, 17:00
Zilang

4. Spatial variation
Concentration: Alkane > Acetylene > Aromatics > Alkene
Hongqiao has relatively higher Alkane and Alkene
Higher Aromatics and Acetylene was observed in Zilang

5. OFP daytime variation Xinghu Hongqiao Zilang
The OFP of Alkane and Alkene showed an increase in the morning then dropped in the afternoon in Hongqiao
The OFP remained at a same level during the day in Xinghu
The OFP of Aromatics increased dramatically in the afternoon in Zilang

6. OFP contribution
Hongqiao
Xinghu
Zilang

7. VOCs species concentration
Correlation
ETHANE
ACETYLENE
N-PENTANE
PROPANE
N-BUTANE
TOLUENE 1
0.84
0.81
0.96
0.78
0.90
0.79
0.89
0.92
0.82
0.88
Common emission source was suggested by the good correlation between top VOCs

8. Sources identification
Fresh combustion sources
Industry dominated
T/B=2
Vehicle dominated
Industrial VOC emission intensity
Hongqiao
Zilang
Xinghu
The average T/B is 2.9, suggesting industrial sources contributed more than that of vehicles
High Acetylene/CO ratio indicates the VOCs emissions was largely influenced by petroleum industry sources

9. Conclusion
Higher alkane and alkene was observed in Hongqiao, and higher aromatics and acetylene was in Zilang
P-xylene and toluene contributed 25% to 35% of the OFP, indicating solvent using to be the most important source, especially in Zilang site.
N-pentane and acetylene consisted 17-23% of the OFP, suggesting petroleum industry and vehicle emissions to be another big contributor.
The most abundant VOCs species were concentration is ethane, acetylene and n-pentane, etc, which were from common emission sources.
Industrial sources is the major contributor for VOCs in Nantong

10. Thank You!