Browsing by Author "Ahmad Zaharin Aris"

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    A baseline study of tropical coastal water quality in Port Dickson, Strait of Malacca, Malaysia
    (Elsevier, 2013) Sarva Mangala Praveena; Ahmad Zaharin Aris
    Tidal variation in tropical coastal water plays an important role on physicochemical characteristics and nutrients concentration. Baseline measurements were made for nutrients concentration and physicochemical properties of coastal water, Port Dickson, Malaysia.
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    Accumulation and risk assessment of heavy metals employing species sensitivity distributions in Linggi River, Negeri Sembilan, Malaysia
    (Elsevier, 2021) Muhammad Raznisyafiq Razak; Ahmad Zaharin Aris; Nurul Amirah Che Zakaria; Sze Yee Wee; Nur Afifah Hanun Ismail
    The constant increase of heavy metals into the aqueous environment has become a contemporary global issue of concern to government authorities and the public. The study assesses the concentration, distribution, and risk assessment of heavy metals in freshwater from the Linggi River, Negeri Sembilan, Malaysia. Species sensitivity distribution (SSD) was utilised to calculate the cumulative probability distribution of toxicity from heavy metals. The aquatic organism's toxicity data obtained from the ECOTOXicology knowledgebase (ECOTOX) was used to estimate the predictive non-effects concentration (PNEC).
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    Active pharmaceutical ingredients in Malaysian drinking water: consumption, exposure, and human health risk
    (Springer, 2020) Sze Yee Wee; Didi Erwandi Mohamad Haron; Ahmad Zaharin Aris; Fatimah Md. Yusoff; Sarva Mangala Praveena
    Active pharmaceutical ingredients (APIs) are typical endocrine disruptors found in common pharmaceuticals and personal care products, which are frequently detected in aquatic environments, especially surface water treated for drinking. However, current treatment technologies are inefficient for removing emerging endocrine disruptors, leading to the potential contamination of tap water. This study employed an optimized analytical method comprising solid-phase extraction and liquid chromatography–tandem mass spectrometry (SPE–LC–MS/MS) to detect APIs in tap water in Putrajaya, Malaysia.
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    An overview of groundwater chemistry studies in Malaysia
    (Springer, 2015) Nura Umar Kura; Mohammad Firuz Ramli; Wan Nor Azmin Sulaiman; Shaharin Ibrahim; Ahmad Zaharin Aris
    In this paper, numerous studies on groundwater in Malaysia were reviewed with the aim of evaluating past trends and the current status for discerning the sustainability of the water resources in the country.
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    Anthropogenic waste indicators (AWIs), particularly PAHs and LABs, in Malaysian sediments: Application of aquatic environment for identifying anthropogenic pollution
    (Elsevier, 2016) Najat Masood; Mohamad Pauzi Zakaria; Normala Halimoon; Ahmad Zaharin Aris; Sami M. Magam; Narayanan Kannan; Shuhaimi Mustafa; Masni Mohd Ali; Mehrzad Keshavarzifard; Vahab Vaezzadeh; Sadeq Abdullah Abdo Alkhadher; Najat Ahmed Al-Odaini
    Polycyclic aromatic hydrocarbons (PAHs) and linear alkylbenzenes (LABs) were used as anthropogenic markers of organic chemical pollution of sediments in the Selangor River, Peninsular Malaysia. This study was conducted on sediment samples from the beginning of the estuary to the upstream river during dry and rainy seasons.
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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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    Artificial neural network modeling of the water quality index for Kinta River (Malaysia) using water quality variables as predictors
    (Elsevier, 2012) Nabeel M. Gazzaz; Mohd Kamil Yusoff; Ahmad Zaharin Aris; Hafizan Juahir; Mohammad Firuz Ramli
    This article describes design and application of feed-forward, fully-connected, three-layer perceptron neural network model for computing the water quality index (WQI)1 for Kinta River (Malaysia).
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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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    Bioaccumulation of zinc in edible tropical vegetables in Peninsular Malaysia and its human health risk assessment based on various ethnicities in Malaysia
    (Springer, 2021) Koe Wei Wong; Chee Kong Yap; Aziran Yaacob; Rosimah Nulit; Hishamuddin Omar; Ahmad Zaharin Aris; Moslem Sharifinia; Alireza Riyahi Bakhtiari; Salman Abdo Al-Shami; Muhammad Saleem; Hideo Okamura
    Along with the growing utilization of zinc (Zn) and Zn-containing nanoparticles in various industries, Zn ecotoxicological evaluation on human food supply is necessary even though Zn is generally considered safe and rarely concentrated ecotoxicologically. This study aimed to investigate the bioaccumulation of Zn in 18 species of vegetables (seven leafy, nine fruity vegetables and one species each of tuber and legume) collected from two farming sites in the west coast of Peninsular Malaysia. A human health risk assessment (HHRA) was also conducted.
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    Concentration of ions in selected bottled water samples sold in Malaysia
    (Springer, 2023) Ahmad Zaharin Aris; Ryan Chuan Yang Kam; Ai Phing Lim; Sarva Mangala Praveena
    Many consumers around the world, including Malaysians, have turned to bottled water as their main source of drinking water. The aim of this study is to determine the physical and chemical properties of bottled water samples sold in Selangor, Malaysia.
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    Contamination assessment and potential human health risks of heavy metals in Klang urban soils: a preliminary study
    (Springer, 2014) Sarva Mangala Praveena; Nurul Syazani Yuswir; Ahmad Zaharin Aris; Zailina Hashim
    Urban areas with rapid industrial development have major impacts on environmental soil quality. This study was carried out to determine contamination assessment of heavy metal concentration of urban soil from Klang district (Malaysia). Health risk assessment was used to determine potential health risks (carcinogenic and non-carcinogenic risks) in both adults and children. Moreover, this study was also used to identify the most significant contaminant and exposure pathway with regard to Klang urban soil.
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    Detecting and predicting the impact of land use changes on groundwater quality, a case study in Northern Kelantan, Malaysia
    (Elsevier, 2017) Tahoora Sheikhy Narany; Ahmad Zaharin Aris; Anuar Sefie; Saskia Keesstra
    The conversions of forests and grass land to urban and farmland has exerted significant changes on terrestrial ecosystems. However, quantifying how these changes can affect the quality of water resources is still a challenge for hydrologists. Nitrate concentrations can be applied as an indicator to trace the link between land use changes and groundwater quality due to their solubility and easy transport from their source to the groundwater. In this study, 25 year records (from 1989 to 2014) of nitrate concentrations are applied to show the impact of land use changes on the quality of groundwater in Northern Kelantan, Malaysia, where large scale deforestation in recent decades has occurred.
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    Distribution of metals and quality of intertidal surface sediment near commercial ports and estuaries of urbanized rivers in Port Klang, Malaysia
    (Springer, 2015) Hazzeman Haris; Ahmad Zaharin Aris
    Thirty intertidal surface sediment samples with replicates were collected from Port Klang and the concentration of metals, sediment particle size and amount of organic matter were determined.
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    Ecological risk estimation of organophosphorus pesticides in riverine ecosystems
    (Elsevier, 2017) Sze Yee Wee; Ahmad Zaharin Aris
    The risk quotient (RQ) method was applied to assess the potential risk of organophosphorus pesticides (OPPs), primarily focusing on riverine ecosystems. Using the available ecotoxicity data, aquatic risks from OPPs (diazinon and chlorpyrifos) in the surface water of the Langat River, Selangor, Malaysia were evaluated based on general (RQm) and worst-case (RQex) scenarios. Since the ecotoxicity of quinalphos has not been well established, quinalphos was excluded from the risk assessment.
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    Elemental hydrochemistry assessment on its variation and quality status in Langat River, Western Peninsular Malaysia
    (Springer, 2013) Wan Ying Lim; Ahmad Zaharin Aris; Tengku Hanidza Tengku Ismail; Mohamad Pauzi Zakaria
    This paper discusses the hydrochemistry variation and its quality status in Langat River, based on the chemistry of major ions, metal concentrations and suitability for drinking purposes. Water samples were collected from 30 different stations to assess their hydrochemical characteristics.
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    Extent and severity of groundwater contamination based on hydrochemistry mechanism of sandy tropical coastal aquifer
    (Elsevier, 2012) Noorain Mohd Isa; Ahmad Zaharin Aris; Wan Nor Azmin Wan Sulaiman
    Small islands are susceptible to anthropogenic and natural activities, especially in respect of their freshwater supply. The freshwater supply in small islands may be threatened by the encroachment of seawater into freshwater aquifers, usually caused by over pumping. This study focused on the hydrochemistry of the Kapas Island aquifer, which controls the groundwater composition. Groundwater samples were taken from six constructed boreholes for the analysis and measurement of its in-situ and major ions.
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    Extenuation of saline solutes in shallow aquifer of a small tropical island: A case study of Manukan Island, North Borneo
    (Thai Society of Higher Education Institutes on Environment, 2010) Ahmad Zaharin Aris; Mohd Harun Abdullah; Sarva Mangala Praveena; Mohd Kamil Yusoff; Hafizan Juahir
    Intensive exploitation of groundwater from Manukan Island, s aquifer has disturbed the natural equilibrium between fresh and saline water and has resulted in the increase of groundwater salinity and the hydrochemical complexities of freshwater-seawater contact. It was observed that the mixing between freshwater-seawater has created diversity in the geochemical processes of Manukan Island, s aquifer and altered the freshwater and seawater mixture away from the theoretical composition line.
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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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    Health risk assessment of heavy metal in urban surface soil (Klang District, Malaysia)
    (Springer, 2015) Nurul Syazani Yuswir; Sarva Mangala Praveena; Ahmad Zaharin Aris; Sharifah Norkhadijah Syed Ismail; Zailina Hashim
    In this study, a total of 76 urban surface soil samples were collected in the Klang district (Malaysia), and analyzed for total and bioavailable heavy metal concentrations by inductively coupled plasma-optical emission spectrometry.
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    Heavy metals dynamics and source in intertidal mangrove sediment of Sabah, Borneo Island
    (Thai Society of Higher Eduation Institutes on Environment, 2010) Sarva Mangala Praveena; Ahmad Zaharin Aris; Miroslav Radojevic
    There is increasing concern about the impact of anthropogenic activities in many tropical coastal areas such as in mangrove forest. Heavy metal cycling is a serious problem faced in mangrove environments due to the anthropogenic activities. This study was carried out to investigate the dynamics of heavy metals dynamics concentration.