Hafizan Juahir

• PhD in Chemometrics; Environmental Forensics; Environmental Modelling
• Director at Universiti Sultan Zainal Abidin

Non-volant mammals in Peninsular Malaysia face numerous threats, primarily driven by habitat loss, fragmentation and illegal hunting. These threats highlight the importance of conducting wildlife surveys in the available forested areas to enhance the current strategies for conservation and management, particularly for a threatened taxon like non-vo...

Purpose This study aims to construct comprehensive index of Tahfiz empowerment taking into account various factors such as social, intellectual, physical and religious, as well as economical. According to Maqasid Shariah, Malaysia has to establish a Tahfiz Empowerment Index (TEI) for the implementation of National Tahfiz Education Policy (NTEP) to...

Leachate landfill management poses significant environmental challenges due to its complex composition and potential for water resource contamination. Coagulation-based physical/chemical treatments, particularly those using Polyferric Sulphate (PFS), have emerged as effective solutions. This study investigates the influence of Copperas concentratio...

The effect of clay dosage of Tetrabutylammonium-Modified Montmorillonite (TBr MMT) and Tetrachloride-Modified Montmorillonite (TCl MMT) on physico-chemical properties, morphology, the permeation characteristics, and mechanical properties of the prepared membrane were investigated in detail. The presence of TBr MMT and TCl MMT in PES membrane were c...

The usage of malathion pesticide and a subsequent release into the environment was a major concern worldwide due to detrimental effect and their toxicity to ecosystem. Concerned about the impact of malathion pesticide, this study investigated the effectiveness of granular activated carbon (GAC) in removing malathion from agricultural runoff. The...

Biological treatment is currently a favorable option to treat wastewater due to its environmentally friendly methods and minimal toxic by-products. The majority of biological wastewater treatment uses bacteria as treatment agents, which are known to have excellent capabilities for removing various pollutants. Researchers have extensively explored t...

Oil is still the main source of energy in various sectors, such as transportation, industries, and electricity. As one of the developing countries, Indonesia has enormous activities related to oil, including drilling, transporting, and refining. This paper aimed to provide a review of the cases of oil spills in the Indonesian coastal area as an imp...

Wastewater treatment is a critical process for maintaining environmental sustainability. In recent years, natural sources have been explored for their potential in wastewater treatment. This study investigated the suitability of chicken eggshells as a bioflocculant for biofloc harvesting in aquaculture. The eggshells were analyzed using X-ray diffr...

The presence of harmful substances in the atmosphere poses significant risks to the environment and public health. These pollutants can come from natural sources like dust and wildfires, or from human activities such as industrial, transportation, and agricultural practices. The objective of this study was to assess air quality on the East Coast of...

Mangroves are well known for their ability to sequester and store a large amount of carbon within their plant parts and sediment. This characteristic is termed as blue carbon and important to combat the global warming through carbon sink and carbon storage. Studies on blue carbon are vast globally however the environmental parameters that regulated...

This bibliometric study examines scholarly research on agricultural wastewater treatment using Scopus data from 1971 to 2023 by exploring publication trends, leading countries, prolific authors, and keyword co-occurrences. This study was conducted using VOSviewer software (version 1.6.17) which enables advanced bibliometric analysis and visualizati...

Air pollution poses significant risks to human health, the environment, and the economy. Therefore, striving for cleaner air through efficient air quality monitoring is imperative for fostering a healthier and more sustainable future. Predicting air quality is essential to enhance the quality of life, maintain environmental sustainability, and redu...

This research aimed to identify water quality changes in the Cirata Reservoir and the factors affecting them in terms of hydrology and climate. The sampling was carried out in both the rainy and dry seasons at 12 locations in the Cirata Reservoir. The Mann–Whitney U-test (different test) results showed that salinity, total suspended solids (TSS), t...

Spiritual healing and Quranic sound therapy has long accompanied human tradition since decades. Quranic sound is perceived as rhythmical cues that portrays psychospiritual effects although it was not recited with external melodic intonation (tarannum). Its internal rhythms were believed to activate and synchronize its listeners’ brain rhythms hence...

Lakes may take a while to respond to management interventions because of the management implications of incremental development and degradation issues. This includes the requirement for the ongoing participation of key lake basin management institutions and their operations. This study’s objective is to assess the impacts of land use activities alo...

Freshwater invasive alien species (IAS) are non-native organisms that were intentionally or unintentionally released into local water bodies and later harmed the invaded habitat by disrupting the ecological processes. Over the last few years, environmental deoxyribonucleic acid (eDNA) analyses have been used in many studies to detect IAS, with posi...

This study aimed to classify the spatiotemporal analysis of rainwater quality before and during the Movement Control Order (MCO) implementation due to the COVID-19 pandemic. Chemometric analysis was carried out on rainwater samples collected from 24-gauge stations throughout Malaysia to determine the samples’ chemical content, pH, and conductivity....

The study investigates the latent pollution sources and most significant parameters that cause spatial variation and develops the best input for water quality modelling using principal component analysis (PCA) and artificial neural network (ANN). The dataset, 22 water quality parameters were obtained from Department of Environment Malaysia (DOE). T...

Sound has rhythms that can interact with human brain rhythms. The interaction may improve human cognition through neuronal synchronization. However, research on the synchronization effects of listening to the Holy Quran remains elusive. This study aimed to learn the potential synchronous effects of Quranic listening in beta frequency through electr...

The impact of flood mitigation project in the Kemaman River Basin was assessed in this study. Salinity intrusion was simulated in the study area by 1D numerical model. A 1-D hydrodynamic model coupled with a salinity model was used to analyze the salinity intrusion within Chukai River after the implementation of the flood mitigation project. The mo...

Background: There is a need to analyze a worldwide database of the coronavirus disease of 2019 (COVID-19) pandemic.This may prove valuable to facilitate better strategies and planning on prevention, screening, surveillance, early diagnosis, containment and treatments. Method: We extracted 14,259 case reports of COVID-19 dated 11th November 2019 to...

The increasing demands in textile industries has created huge production of textile coloured products globally, leading to large production of textile effluent. Textile effluent is often discharged to the environment without proper treatment by the textile factories. The untreated textile effluent typically contains harmful chemicals and is hazardo...

Background: Listening to Quranic recitation has been claimed to enhance educational performance and cognitive functionality. Unfortunately, scientific evidence for this remains scarce. Aim: Hence, we aimed to investigate the neural mechanism underlined the psychoacoustic and cognitive enhancement effects from listening to Quranic recitation. Occipi...

COVID-19 has triggered a global health crisis. Death from severe respiratory failure and symptoms, including fever, dry cough, sore throat, anosmia, and gastrointestinal disturbances, has been attributed to the disease. Development of screening and diagnosis methods prove to be challenging due to shared clinical features between COVID-19 and other...

This study aims to identify the degree of which factors contribute to the rainwater quality and understanding anthropogenic contributions to the atmospheric environment. A total of 1830 rainwater data were collected from rain gauge stations distributed all over the country. Factor analysis were applied to the studied variables to evaluate the physi...

This study analyzed the volatile organic compounds (VOCs) of four different pineapple varieties (MD2, Sarawak, Josephine and Morris). Head Space-Solid Phase Micro Extraction (HS-SPME) was used to extract the VOCs of those pineapples using Gas Chromatography-Mass Spectrometry (GC-MS). Analysis of pineapples extracts identified many types of VOCS inc...

Groundwater can be contaminated by many sources, such as anthropogenic activities on the ground surface. To evaluate the vulnerability of groundwater to contamination, the present study was conducted in the shallow alluvial aquifer of Bachok, Kelantan, by embedding several hydrogeological parameters using the GIS-based DRASTIC model. Considering th...

This study is to identify local isolates from textile dye wastewater and its antibiotic resistance effects on the environment. The textile dye wastewater was collected from local factories and microbes were extracted from wastewater and grown on the bacterial agar. Both biochemical tests and molecular studies were performed where Gram staining, DNA...

Rainwater harvesting is an effective alternative practice, particularly within urban regions, during periods of water scarcity and dry weather. The collected water is mostly utilized for non-potable household purposes and irrigation. However, due to the increase in atmospheric pollutants, the quality of rainwater has gradually decreased. This atmos...

Objectives : This study evaluated and identified the removal of colors and chemocal oxygen demands from thextile dye effluents by Bacillus cereus isolated from the local textile wastewater treatment plant. Methods : Central composite design (CCD) from response surface methodology (RSM) was applied in order to achieve the optimized treatment process...

Sewage contamination is a principal concern in water quality management as pathogens in sewage can cause diseases and lead to detrimental health effects in humans. This study examines the distribution of seven sterol compounds, namely coprostanol, epi-coprostanol, cholesterol, cholestanol, stigmasterol, campesterol, and β-sitosterol in filtered and...

As part of the implementation of a rainwater harvesting system as an alternative water source supply for non-potable use, therefore the characteristic of chemical compounds was significantly explored. The Department of Chemistry, Malaysia, gave the data set for three years (2017-2019). Some chemometric techniques, including PCA, were performed to i...

The main focus of this study is exploring the spatial distribution of polyaromatics hydrocarbon links between oil spills in the environment via Support Vector Machines based on Kernel-Radial Basis Function (RBF) approach for high precision classification of oil spill type from its sample fingerprinting in Peninsular Malaysia. The results show the h...

Textile industry has been rapidly progressing over the years, leading to an increasing volume of water usage that contributes to the large production of textile wastewater. Biological treatment processes have been proven to be the most environmentally friendly, cost-effective and requiring reduced production treatment by-products. In this study, us...

A surface water quality assessment was carried out to explore the spatial variations between lakes and ex-mining ponds in Malacca with the aid of chemometrics tools. The physio-chemical data included pH, dissolved oxygen, total dissolved solids, electrical conductivity, biological oxygen demand, and ammoniacal nitrogen, which were measured in situ....

Reservoirs play a strategic role in the context of sustainable energy supply. Unfortunately, the majority of the reservoirs are facing water-quality degradation due to complex pollutants originating from activities both in the catchment and inside the reservoir. This research was aimed at assessing the extent of the water degradation, in terms of c...

The present study is aimed at developing a capability index for performance in soccer and explore its differences with regards to specific skills and fitness-related attributes in the sport. A total of 87 adolescent soccer athletes aged 12 years old were recruited as participants. Relative performance namely anthropometrics, physical fitness, and s...

This research aims to identify the influence of zone, gender, RAE, and fitness performance variables and their relationship with physical fitness and anthropometric attributes of Malaysian children. Data were obtained from 43607 participants aged 7 years old in Malaysia. The participants completed the multiple of test (anthropometrics, standing bro...

One of the characteristics of population growth is that it takes place very slowly in the early stages, then rises sharply and slows down as it approaches the maximum carrying capacity. Population growth models with these characteristics are called logistic models. In this article, a logistical growth model with a time-dependent environmental carry...

Biasness selection during talent identification program in sports may occurred due to the chronological age system applied nowadays. The aim of this study is to recognize pattern on anthropometric and fitness components relative birth-month quartiles among studied population. A total of 39372 boys (aged 7.36 ± 0.29 year) and 33723 girls aged (7.34...

The per capita Gross Domestic Product (GDP) measures a country’s economic growth. Increasing GDP is a dream of all countries, but generally, GDP increases often have a negative impact with increasing CO 2 emissions. This paper intends to model the impact of GDP growth based on constant prices and the population in increasing CO 2 emissions in Indon...

Danau Kota Lake is public attraction area, located in the middle area of Kuala Lumpur. An excessive count of visitors visiting the lake has weakening the lake water quality. The present study was driven to evaluate the lake water quality for environmental conservation. Some water quality and metals data were in-situ measured whereas some were colle...

This study investigates and proposes a reduction in the number of water quality monitoring stations, parameters and develops the best input combination for water quality modelling using artificial neural network and multivariate statistical technique. Fourteen water quality physicochemical parameters acquired from eight monitoring sites for 8 years...

This study investigates the nature of governance system around Limboto Lake and its impact on the conservation of the freshwater resources. It also seeks to understand the structural process and contribution of local knowledge in freshwater conservation, which is a gap identified in freshwater governance. Data was based on residents’ impact and ins...

Environmental influences such as residence effect on athletic talent identification and development have become an interest topic for sport scientists. Residence effects occur when being live in a certain city size leads to participation or performance advantages, typically for those live in smaller or mid-sized cities. The purpose of this study wa...

The objective of the study is to compare physical fitness between urban and rural school children and to determine relationship between body mass index and physical fitness primary school children in east coast of Peninsular Malaysia. This study is a cross-sectional study and conducted in primary schools. Anthropometric measurement involved weight...

It is essential for coaches to understand the uniqueness of psychological elements and personality traits factors amongst athletes’ in order to optimise transmission of messages for efficient performance. The present study intends to explore the personality traits and psychological coping skills with their association to archery performance. A tota...

In this paper, a study on the development of water quality index of ex-mining ponds was carried out for proper assessment and utilization of the abundant ex-mining ponds in Malaysia. Heavy metals were analyzed using inductively coupled plasma mass spectrophotometer (ICPMS), and physico chemical parameters were analyzed in-situ. Chemometric analysis...

Sea level rise would be expected to have several impacts, particularly on Malaysia coastal systems such as changes in sedimentation, erosion, flooding and groundwater inundation, storm surge and waves, and sea water intrusion. The purpose of this study is to analyzes the trend variation of sea level rise (SLR) and modelling the SLR for selected loc...

PM10 is one of the major concerns that have high potential for harmful effects on human health. Thus, prediction of PM10 was performed with the objectives to model suitable PM10 prediction formula to predict the concentration of PM10. Imputation methods of EMB-algorithm and nearest neighbor were applied to treat missing data before analyzed by Fit...

The objectives of this paper are to review the status of Klang River Basin and to investigate the most significant pollutant using chemometric techniques. The extraction of secondary physico-chemical water quality data by Department of Environment, Malaysia from 2003 to 2007 were taken. Principal Component Analysis (PCA) used to identify the signif...

This study investigates dispositional of goal orientation in player performance on different positions. Data were obtained from 223 participants in a research aged 13 to 17 years old in Malaysia. Data interpretation was carried out using cluster analysis (CA) and discriminant analysis (DA). Players completed the Task and Ego Orientation in Sport Qu...

This study aims to compare dominant factors of anthropometrics and motor component among children relative body mass index. A total 5819 primary school children (3243 boys and 2576 girls) aged 7.30±0.28 years old were subdivided into four groups according their Body Mass Index (BMI) namely underweight group (UWG), normal weight group (NWG), overwei...

This study aims to identify the possible sources in drinking water parameters heavy metal and organic parameters (HMOPs) and spatial variation between untreated water and treated water at Federal Territory of Kuala Lumpur water treatment plant. The indicator HMOPs in drinking water in Kuala Lumpur were selected as parameters to discriminate the pos...

This study develops an Athlete Performance Capabilities Index (APCI) model using multivariate analysis for selecting the best player of under twelve (U12). Measurement of anthropometrics and physical fitness were evaluated among 178 male players aged 12±0.52 years. Factor score derived by Principal Component Analysis were used to obtain a model for...

Magnetic Data Acquisition System (MAGDAS) is a magnetometer initiated by the International Center for Space Weather Science and Education in Kyushu University, Japan, to study space weather. The latest of real-time Magnetic Data Acquisition System/Circum-pan Pacific Magnetometer Network was successfully installed at the East Coast Environmental Res...

Purpose The aim of this investigation was to determine the most significant cardiopulmonary parameters bound with high archery scores and to assess their relationship with successful performance in archery. Methods The total of 32 archers with mean age of 17 ± 0.56 years were gathered from dissimilar archery programmes. Cardiopulmonary parameters...

Substance abuse has been a longstanding global issue. Efforts are continuing to find solutions. Family support is important and occurs in different forms. This study was designed to identify factors influencing family support and to relate them to the types of support given to help develop family support indices. Factors deemed to influence family...

This study analyzed the volatile organic compounds (VOCs) of three mango varieties (Harumanis, Tong Dam and Susu) for the discrimination of authentic Harumanis from other mangoes. The VOCs of these mangoes were extracted and analysed nondestructively using Head Space-Solid Phase Micro Extraction (HS-SPME) coupled to Gas Chromatography-Mass Spectrom...

Pahang is placed at the east coast of Peninsular Malaysia and has a lot of attractive coasts with interesting scenery, which can capture the attention of people to the coasts. The seven (7) of significant coasts namely Pantai Cherating, Holiday Villa beach, Pantai Balok, Sungai Ular, Pantai Sepat, Pantai Cheruk Palok and Pantai Tanjung Agas are cla...

Titiwangsa Lake is a renowned recreational lake in Kuala Lumpur, Malaysia. The present study was purposely to define the current status of Titiwangsa Lake water quality and propose a water quality monitoring program to conserve and sustain the health of this lake. Samples were collected in January 2017 during the day and night-time periods. Spatial...

Air pollution has been considered a devastating environmental issue that can negatively impact human health and the environment. Kuching as one of the capital cities in Malaysia is also affected by air pollution and unsatisfactory air quality condition. Thus, the main objective is to identify the source of variation on regional impact of air qualit...

Kenyir Lake's natural environment experienced significant changes over the past 20 years. Pressure from anthropogenic activities such as deforestation, construction, and sand mining around Sungai Terengganu, tourism, farming and agricultural has creating imbalance between environmental processes and response in Kenyir Lake. The aim of the study is...

This study aims to dismantling number drug abuser, cohort of age and drug type effects to improve our understanding of these trends and suggested groups for target intervention by stakeholders to effectively reduce resultant harms. Data of the study involving number of drug abuser, cohort of age (8 groups: < 13, 13-15, 16-19, 20-24, 25-29, 30-34, 3...

Cajuputi essential oil is extracted from the leaves of Melaleuca cajuputi Powell. This study is performed to spatially classify the variation of Melaleuca cajuputi essential oil fingerprint based on different sampling location using chemometric technique along Terengganu coastal area. Discriminant Analysis (DA) successfully discriminate 10 fingerpr...

This study aims to identify the most significant parameters in drinking water quality, spatial disparities of treated water (TW) and performance of water treatment plant (WTP) in Selangor. Physico- chemical (PCPs), Inorganic (IPs), Heavy metal and organic (HMOPs) and pesticide (PPs) were selected as parameters to discriminate the source of WTP poll...

The study on Watershed Sustainability Index (WSI) has been conducted to analyst the environmental condition in the area incorporating ecological baseline and socio-economic conditions. WSI is an integrated indicator based on basin Hydrology, Environment, Life and Policy (HELP) state condition. It is suitable to be applied in the Langat River Basin...

Coastal groundwater is extremely vulnerable to saltwater contamination. This study was conducted to investigate the potential contami-nation of saltwater into coastal groundwater temporally. Data was obtained from PT000017 monitoring well from 2006 to 2012. Nine parameters of water quality were involved for data analyses. Two main diagrams used for...

This research focuses on the use of the DMAIC method (Define, Measure, Analyze, Improve and Control) as a Six Sigma approach in studying oil spill fingerprint of samples recovered from Peninsular Malaysia and Sabah (East Malaysia). The DMAIC approach in this study was used as a way to classify oil types based on data obtained from GC-FID and GC-MS...

The use of radioisotopes ²¹⁰Pb and ²²⁶Ra in establishing the geochronology of pollutants in the sediment core and sediment dating is being widely used in the world. The present study was conducted in Brunei Bay region of Malaysian waters to define the sedimentation rate and sediment age as well as to investigate the possible sources of pollutants i...

Volatile organic compounds (VOCs) play an important role in the generation of ground level ozone and secondary organic aerosol. Most tropical countries such as Malaysia, Singapore, Indonesia, Brunei experience high ozone pollution. Beside ozone, oxides of nitrogen (NOx) from vehicular emissions also play an important role in photochemical pollution...

Terengganu River Basin is situated in the north eastern coastal region of Peninsular Malaysia. 29 sampling stations were selected. The water quality parameters were measured such as Dissolved Oxygen (DO), Total Suspended Solids (TSS) and Suspended Sediment Concentration (SSC). Results showed that the range of DO (2.11 mg/L - 8.07 mg/L), TSS (0.4 mg...