Browsing by Author "Royston Uning"

Now showing 1 - 7 of 7
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    Ambient BTEX levels over urban, suburban and rural areas in Malaysia
    (Springer, 2019) Haris Hafizal Abd Hamid; Mohd Talib Latif; Mohd Shahrul Mohd Nadzir; Royston Uning; Md Firoz Khan; Narayanan Kannan
    Benzene, toluene, ethylbenzene and xylene isomers (BTEX) are volatile organic air pollutants of concern which arise from natural and anthropogenic sources. This study aims to determine and evaluate the BTEX levels in ambient air in selected areas of Malaysia, namely: Kuala Lumpur (KL-urban), Penang (PG-urban), Bangi (BG-suburban), Langkawi (LGK-suburban) and the Danum Valley (DV-rural). Active sampling with sorbent tubes was applied in this study and samples were analysed using thermal desorption (TD) coupled with gas chromatography-mass spectrometry (GC-MS).
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    Assessment on the distributions and exchange of anionic surfactants in the coastal environment of Peninsular Malaysia: A review
    (Springer, 2022) Royston Uning; Suhaimi Suratman; Mohd Talib Latif; Nur Ili Hamizah Mustaffa
    Terrestrial anionic surfactants (AS) enter the marine environment through coastal region. Despite that, in general limited knowledge is available on the coastal AS transfer pathway. This paper aims to assess the distributions and exchange of AS in the Peninsular Malaysia coastal environments, adjacent to the southern waters of South China Sea and Strait of Malacca.
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    BTEX compositions and its potential health impacts in Malaysia
    (Elsevier, 2019) Mohd Talib Latif; Fatimah Ahamad; Md Firoz Khan; Mohd Shahrul Mohd Nadzir; Murnira Othman; Mazrura Sahani; Muhammad Ikram Abdul Wahab; Noorlin Mohamad; Royston Uning; Seng Chee Poh; Muhammad Fais Fadzil; Justin Sentian; Norhayati Md Tahir; Haris Hafizal Abd Hamid
    This study aims to determine the composition of BTEX (benzene, toluene, ethylbenzene and xylene) and assess the risk to health at different sites in Malaysia. Continuous monitoring of BTEX in Kuala Lumpur City Centre, Kuala Terengganu, Kota Kinabalu and Fraser Hill were conducted using Online Gas Chromatograph.
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    Distribution of surfactants in the sea surface microlayer and sub-surface water in the Melaka River Estuary
    (Springer, 2019) Leonie Jaeger; Royston Uning; Norfazrin Mohd Hanif; Mohd Talib Latif
    This study determines the levels of surfactants at 12 stations located in the Melaka River Estuary. This river estuary is located within a tourism area of Melaka Historical City.
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    Observations of BTEX in the ambient air of Kuala Lumpur by passive sampling
    (Elsevier, 2020) Haris Hafizal Abd Hamid; Mohd Talib Latif; Royston Uning; Mohd Shahrul Mohd Nadzir; Md Firoz Khan; Goh Choo Ta; Narayanan Kannan
    Benzene, toluene, ethylbenzene and xylenes (BTEX) are well known hazardous volatile organic compounds (VOCs) due to their human health risks and photochemical effects. The main objective of this study was to estimate BTEX levels and evaluate interspecies ratios and ozone formation potentials (OFP) in the ambient air of urban Kuala Lumpur (KL) based on a passive sampling method with a Tenax® GR adsorbent tube. Analysis of BTEX was performed using a thermal desorption (TD)-gas chromatography mass spectrometer (GCMS). OFP was calculated based on the Maximum Incremental Reactivity (MIR).
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    Spatial and temporal variations in nutrients during upwelling season off the east coast of Peninsular Malaysia
    (Springer, 2021) Royston Uning; Suhaimi Suratman; Fatin Adlina Md Nasir; Mohd Talib Latif
    This study determines the bulk surface water (BSW) dissolved inorganic nutrients of nitrogen (DINi) and phosphate (DIP) during the upwelling season off the east coast of Peninsular Malaysia, South China Sea.
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    Spatial distribution of fine and coarse particulate matter during a southwest monsoon in Peninsular Malaysia
    (Elsevier, 2021) Munira Othman; Mohd Talib Latif; Anas Ahmad Jamhari; Haris Hafizal Abd Hamid; Royston Uning; Md Firoz Khan; Mohd Shahrul Mohd Nadzir; Mazrura Sahani; Muhammad Ikram Abdul Wahab; Kok Meng Chan
    This study aimed to determine the spatial distribution of PM2.5 and PM10 collected in four regions (North, Central, South and East Coast) of Peninsular Malaysia during the southwest monsoon. Concurrent measurements of PM2.5 and PM10 were performed using a high volume sampler (HVS) for 24 h (August to September 2018) collecting a total of 104 samples. All samples were then analysed for water soluble inorganic ions (WSII) using ion chromatography, trace metals using inductively coupled plasma-mass spectroscopy (ICP-MS) and polycyclic aromatic hydrocarbon (PAHs) using gas chromatography-mass spectroscopy (GC-MS).