Browsing by Author "Ley Juen Looi"

Now showing 1 - 4 of 4
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    Application of enrichment factor, geoaccumulation index, and ecological risk index in assessing the elemental pollution status of surface sediments
    (Springer, 2019) Ley Juen Looi; Ahmad Zaharin Aris; Fatimah Md. Yusoff; Noorain Mohd Isa; Hazzeman Haris
    Sediment can accumulate trace elements in the environment. This study profiled the magnitude of As, Ba, Cd, Co, Cu, Cr, Ni, Pb, Se, and Zn pollution in surface sediments of the west coast of Peninsular Malaysia. Trace elements were digested using aqua regia and were analyzed using the inductively coupled plasma-mass spectrometry. The extent of elemental pollution was evaluated using with the enrichment factor (EF) and geoaccumulation index (Igeo).
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    Baseline metals pollution profile of tropical estuaries and coastal waters of the Straits of Malacca
    (Elsevier, 2013) Ley Juen Looi; Ahmad Zaharin Aris; Wan Lutfi Wan Johari; Fatimah Md. Yusoff; Zailina Hashim
    The status report on metal pollution in tropical estuaries and coastal waters is important to understand potential environmental health hazards. Detailed baseline measurements were made on physicochemical parameters (pH, temperature, redox potential, electrical conductivity, salinity, dissolved oxygen, total dissolved solid), major ions and metals concentrations at estuaries and coastal waters along the Straits of Malacca.
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    Geo-accumulation index and contamination factors of heavy metals (Zn and Pb) in urban river sediment
    (Springer, 2017) Hazzeman Haris; Ley Juen Looi; Ahmad Zaharin Aris; Nor Farhanna Mokhtar; Nur Ain Ayunie Ayob; Fatimah Md. Yusoff; Abu Bakar Salleh; Sarva Mangala Praveena
    The aim of the present study was to appraise the levels of heavy metal contamination (Zn and Pb) in sediment of the Langat River (Selangor, Malaysia). Samples were collected randomly from 15 sampling stations located along the Langat River. The parameters measured were pH, redox potential, salinity, electrical conductivity, loss of ignition, cation exchanges capacity (Na, Mg, Ca, K), and metal ions (Zn and Pb).
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    Mercury contamination in the estuaries and coastal sediments of the Strait of Malacca
    (Springer, 2015) Ley Juen Looi; Ahmad Zaharin Aris; Fatimah Md. Yusoff; Zailina Hashim
    Sediment is a great indicator for assessing coastal mercury contamination. This work profiled the magnitude of mercury pollution in the tropical estuaries and coastal sediments of the Strait of Malacca. Mercury was extracted through the ultrasound-assisted mercury extraction method and analyzed using the flow injection mercury system.