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Atmospheric concentrations and gas - particle partitioning of Polycyclic Aromatic Hydrocarbons (PAHs) and Nitro-PAHs at Indo-Gangetic sites

Abstract

Aerosol samples in the dual-phase (gaseous and particulate) were collected simultaneously for the first time in Agra at a rural and traffic dominated site during post monsoon and winter season to investigate the gas-particle partitioning of polycyclic aromatic hydrocarbons (PAHs). Samples were collected using High Volume Sampler on Quartz micro fiber filter papers and Poly Urethane Foam plugs for particulate and gas phase respectively. Samples were extracted in a mixture of DCM and n-hexane. 16 priority PAHs and two nitro-PAHs were analyzed using Gas Chromatograph-Mass Spectrometry. The total concentration of PAHs (gas + particulate) was 4015 and 624 ng m-3 at traffic and rural site respectively. Two and three ring PAHs were dominant in the gas phase while four, five and six ring PAHs were abundant in the particle phase. Statistically significant correlation (r2 =0.69-0.98, p<0.001) for log Kp vs log Pºl was obtained for individual PAHs at both sites where slopes varied between -2. 83 to -0.04 at traffic site and -3.15 to -0.06 at rural site. Regression statistics of Clausius – Clapeyron plots suggests that concentration of high volatile PAHs in atmosphere is influenced by temperature. Gas- particle partitioning coefficient Kp in its logarithmic form correlated with 1/T (r2 = 0.5 – 0.95, p < 0.001) and positive slope for individual PAH was found. In health risk assessment DbA was found as the most carcinogenic and mutagenic as compared to other PAHs followed by BaP. 1-NPyr had a larger contribution to BaP-TEQ that 3-NFla. Keywords: Gas-particle partitioning, Polycyclic Aromatic Hydrocarbons (PAHs), Health risk assessment.

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Publication details

The article was received on 05 Apr 2017, accepted on 03 Jul 2017 and first published on 07 Jul 2017


Article type: Paper
DOI: 10.1039/C7EM00168A
Citation: Environ. Sci.: Processes Impacts, 2017, Accepted Manuscript
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    Atmospheric concentrations and gas - particle partitioning of Polycyclic Aromatic Hydrocarbons (PAHs) and Nitro-PAHs at Indo-Gangetic sites

    P. K. Verma, D. Sah, K. M. Kumari and A. Lakhani, Environ. Sci.: Processes Impacts, 2017, Accepted Manuscript , DOI: 10.1039/C7EM00168A

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