Document Details

Document Type : Article In Journal 
Document Title :
Urban air polycyclic aromatic hydrocarbons: concentrations, summer/winter variation, gas/particle partitioning and health risk assessment at a traffic area
الهيدروكربونات الأروماتية المتعددة الحلقات فى هواء منطقة حضرية ذات كثافة مرورية: التركيزات، التغيرات الموسمية، التقسيم الغازى/الصلب وتقييم المخاطر الصحية
 
Document Language : English 
Abstract : Atmospheric particulate and gaseous polycyclic aromatic hydrocarbons (PAHs) samples were collected from an urban area in Dokki (Giza) during the summer of 2007 and the winter of 2007 - 2008. The average concentrations of PAHs were 1429.74 ng/m3 in the particulate phase, 2912.56 ng/m3 in the gaseous phase and 4342.30 ng/m3 in the particulate + gaseous phases during the period of study. Dokki has high level concentrations of PAH compounds compared with many polluted cities in the world. The concentrations of PAH compounds in the particulate and gaseous phases were higher in the winter and lower in the summer. Total concentrations of PAHs in the particulate phase and gaseous phase were 22.58% and 77.42% in summer and 36.97% and 63.03% in winter of the total (particulate + gaseous) concentrations of PAHs, respectively. The gaseous/particulate (G/P) ratios of PAHs concentration were 3.43 in summer and 1.71 in winter. Significant negative correlation coefficients were found between the ambient temperature and concentrations of the total PAHs in the particulate and gaseous phases. The distribution of individual PAHs and different categories of PAHs based on aromatic ring number in the particulate and gaseous phases during the summer and winter were nearly similar, indicating similar emission sources of PAHs in both two seasons. Benzo(b)fluoranthene in the particulate phase and naphthalene in the gaseous phase were the most abundant compounds. Diagnostic concentration ratios of PAH compounds indicate that these compounds are emitted mainly from pyrogenic sources, mainly local vehicular exhaust emissions. Health risks associated with the inhalation of individual PAHs in particulate and gaseous phases were assessed on the basis of its benzo(a)pyrene equivalent concentration (BaPeq). Dibenzo(a,h)anthracene and benzo(a)pyrene in the particulate phase and benzo(a)pyrene and benzo(a)anthracene in the gaseous phase were the greatest contributors to the total health risks. The mean contributions of the total carcinogenic activity of all PAHs to the total concentrations of PAHs were 29.37% and 25.15% in the particulate phase and 0.76% and 0.92% in the gaseous phase during the summer and winter, respectively. These results indicate that PAHs in the particulate phase in the ambient air of Dokki may pose a potential health risk. 
ISSN : 63-93 
Journal Name : Journal of Environmental Sciences 
Volume : 38 
Issue Number : 38 
Publishing Year : 1430 AH
2009 AD 
Article Type : Article 
Added Date : Monday, August 22, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
ممدوح إبراهيم خضيرkhoder, Mamdouh IbraheimInvestigatorDoctorateKhoder_55@yahoo.com

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