Summary of Abstract Submission

Abstract Submission No. IO50-05-0056PresentationPoster

CONCENTRATION AND SOURCE IDENTIFICATION OF ATMOSPHERIC POLYCYCLIC AROMATIC HYDROCARBONS (PAHS) IN FIVE ASIAN MEGACITIES

ANDREA .C. RODRIGUES*1, MAHUA SAHA 1, RINA KURUMISAWA2, HIDESHIGE TAKADA2, BADAL BHATTACHARYA3

1 CSIR- NATIONAL INSTITUTE OF OCEANOGRAPHY , INDIA
2 TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY, JAPAN
3 3INSTITUTE OF ECOTOXICOLOGY AND ENVIRONMENTAL SCIENCE, INDIA

ABSTRACT :

Polycyclic Aromatic Hydrocarbons (PAHs) are persistent organic chemicals known for their toxic, mutagenic and carcinogenic properties. The main sources for atmospheric PAHs are incomplete combustion of fossil fuels and biomass. Establishing the abundances and the sources of these gaseous and particle-bound PAHs is essential as these enter the human body through breathing and pose a threat to health. Taking this into consideration, in the present study total PAHs (∑36 PAHs) concentration in particulate matter (PM 2.5) and its seasonal variations were studied in samples collected using High Volume (HV) air sampler on weekly basis for a year from five Asian cities: Beijing, Tokyo, Kolkata, Hanoi and Kuala Lumpur. To identify the sources, hopanes and levoglucosan were used as fossil fuel and biomass markers respectively. The total PAHs concentrations in these cities showed the following trend: Beijing>Kolkata>>Hanoi>Tokyo=Kuala Lumpur. The total PAHs concentrations in Beijing (22.8 to 774ng/m3) were found to be quite high in comparison to other cities around the world. Seasonal variations studies showed an increase in PAHs concentration during the winter and a decrease during rainfalls as rains wash away the particulate matter from atmosphere. Hopane and levoglucosan composition in source material was studied and using these, values for C30 17α /C3017β, C30 hopane/PAHs and levoglucosan/PAHs diagnostic ratios were established. The source was identified by comparing the diagnostic ratios of samples with sources. Study of C30 17α /C3017β and C30 hopane/PAHs ratios revealed that the influence of petrogenic derived PAHs was prevalent in all the five cities. Beijing and Kolkata showed PAHs derived from wood and coal combustion.