Browsing by Author "Nasr Yousef M.J. Omar"
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Item Embargo Chemical characterization of aerosols in Malaysian forested area: Selai, Endau-Rompin Johor National Park(Faculty of Science, Universiti Malaya, 2005) Radzi Bin Abas M.; Nasr Yousef M.J. Omar; Mohd Jamil MaahAtmospheric aerosols from Selai, Endau-Rompin Johor National Park were collected and their solvent-extractable organic compounds were converted to their trimethylsilyl derivatives and analyzed by gas chromatography-mass spectrometry. The principal organic compounds identified were sugar alcohols, triglycerides, fatty acids, hydrocarbons, sugars, and levoglucosan with percent compositions of 58%, 14%, 14%,6%,5%, and 3% respectively. The majority of the organic components of these forest- area aerosols is contributed by microbial sources and biomass burning.Item Embargo Concentrations of PAHs in atmospheric particles (PM-10) and roadside soil particles collected in Kuala Lumpur, Malaysia(Elsevier, 2002) Nasr Yousef M.J. Omar; M. Radzi Bin Abas; Kamal Aziz Ketuly; Norhayati Mohd. TahirThe concentrations of polycyclic aromatic hydrocarbons (PAHs) in atmospheric particles and roadside soil particles were measured at eight locations in the city center and the suburb of Kuala Lumpur, Malaysia. Atmospheric particleswere collected using high-volume PM-10 sampler on glass fiber filters over 24 h average sampling period. Both types of samples were extracted with dichloromethane by ultrasonic agitation. The extracts were then fractionated on an alumina-silica column and the aromatic fraction was subjected to gas chromatography-mass spectrometric (GC-MS) analysis.Item Embargo Distributions and health risks of polycyclic aromatic hydrocarbons (PAHs) in atmospheric aerosols of Kuala Lumpur, Malaysia(Elsevier, 2006) Nasr Yousef M.J. Omar; Tan Chin Mon; Noorsaadah A. Rahman; M. Radzi Bin AbasThe concentrations and distributions of particle bound polycyclic aromatic hydrocarbons (PAHs) collected over a 10 month period in ambient environment, at street levels as well as during a hazy episode are reported. Ambient and street level distributions of PAHs were similar and their occurrence was attributed to vehicular emissions. However, in haze particles, a different pattern of PAHs was observed, characterized by relatively low levels of benzo[a]pyrene (BaP) and high levels of benzofluoranthenes (BFs).Item Embargo Organic composition of aerosol particulate matter during a haze episode in Kuala Lumpur, Malaysia(Elsevier, 2004) M. Radzi Bin Abas; Noorsaadah A. Rahman; Nasr Yousef M.J. Omar; M. Jamil Maah; Azizan Abu Samah; Daniel R. Oros; Angelika Otto; Bernd R.T. SimoneitcThe solvent-extractable compounds of urban airborne particulate matter were analyzed to determine the distributions of homologous and biomarker tracers. Samples were collected by high-volume air filtration during the haze episode of 1997 around the University of Malaya campus near Petaling Jaya, a suburb of Kuala Lumpur, Malaysia.