A5035501672- Groundwater and Isotope Geochemistry
- Marine and coastal ecosystems
- Heavy metals in environment
- Isotope Analysis in Ecology
- Geochemistry and Geologic Mapping
- Ocean Acidification Effects and Responses
- Wastewater Treatment and Nitrogen Removal
- Radioactivity and Radon Measurements
- Coastal wetland ecosystem dynamics
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Mercury impact and mitigation studies
- Soil and Water Nutrient Dynamics
- Thermochemical Biomass Conversion Processes
- Fish Biology and Ecology Studies
- Geochemistry and Elemental Analysis
- Catalysis and Hydrodesulfurization Studies
- Water-Energy-Food Nexus Studies
- Coastal and Marine Dynamics
- Coral and Marine Ecosystems Studies
- Synthesis and Reactions of Organic Compounds
- Geology and Paleoclimatology Research
- Microbial Community Ecology and Physiology
- Synthesis of Organic Compounds
- Atmospheric chemistry and aerosols
Universiti Malaysia Terengganu
2006-2023
Nanyang Technological University
2023
National Centre for Groundwater Research and Training
2012
Abstract We present precipitation isotope data (δ 2 H and δ 18 O values) from 19 stations across the tropics collected 2012 to 2017 under Coordinated Research Project F31004 sponsored by International Atomic Energy Agency. Rainfall samples were daily analysed for stable isotopic ratios of oxygen hydrogen participating laboratories following a common analytical framework. also calculated mean stratiform rainfall area fractions around each station over an 5° x longitude/latitude based on...
Material fluxes at the land-ocean interface impact seawater composition and global cycling of elements. However, most attention has been focused on fluvial dissolved fluxes. For elements like lead (Pb), whose particulate flux into ocean is two orders magnitude higher than counterpart, role particulates in elemental potentially important but currently less appreciated. Using both chemical analyses samples collected from around equatorial Southeast Asia model simulations, we show that...
Abstract The role of permeable sediments and subterranean estuaries as coastal nutrient filters is a question key interest, particularly in areas with high nitrogen loadings. Here, we evaluated the effectiveness sandy estuary cycling removing nitrate using stable isotopes N O at natural (δ 15 N‐NO 3 − δ 18 O‐NO ) enriched levels ( N). Isotopes were used conjunction flow through reactors under anoxic conditions to quantify (1) overall enrichment factor ε) removal processes which was then...
Abstract Estuaries have been identified as sources of nitrous oxide (N 2 O) emissions to the atmosphere but questions remain which production pathway(s) govern oversaturation N O observed in most estuaries worldwide. Here, we use a suite nitrate and isotopes, well 15 site preference signatures assess (1) relative importance different pathways eutrophic groundwater‐impacted salt‐wedge estuary aquifers underlying (2) influence groundwater input on overall saturation estuary. This is one few...
The synthesis of 1,4-dihydropyridine (1,4-DHP) derivatives in the presence alkaline earth metal chlorides was reported.Specifically, MgCl 2 catalyzed 1,4-DHP good yields, ranging from 69 -87%.The Mg 2+ serves as Lewis acid catalyst formation and proposed mechanism elaborated this manuscript.There are many advantages employing a study, including inexpensive, ubiquitous availability metal, simple filtration protocol, which has spark considerable interest use promoting organic reactions.
Abstract Affordable, highly precise, and accurate CO 2 sensor is a prerequisite for more extensive measurements in various environmental settings, thus local global carbon budgets. Here, we propose the use of an autonomous system detection concentration (mole fraction), appropriate inland freshwater eutrophic coastal environments. We describe construction sensing device (SIPCO ‐II) using off‐the‐shelf commercial products that integrate wireless communication capability. also report proof...
Dissolved inorganic carbon (DIC) is an important parameter of the marine carbonate system. Underway analyses DIC are required to describe spatial and temporal changes in systems. In this study, we developed a microvolume flow detection method for underway determination waters, using gas-diffusion analysis conjunction with electrical conductivity (EC) measurement. Only acid carrier reagent (0.2 mol.L−1) ultrapure water acceptor monitoring system, sampling loop (100 µL) used quantify injection...
The notched threadfin bream, Nemipterus peronii, is captured using a gill net or trap (bubu) in Malaysia.Accessibility to 5 locations and 42 samples enabled the present investigation.Samples originating from nearshore environments accumulated Cr, Cu, Fe, Se lesser quantities than open water samples.For size-to-weight evaluations, fish caught bubu weighed less those nets.Although correlation was poor for their location (p = 0.066), data better correlated ~0.30-0.60)for accumulation of Fe...
Abstract The floating chamber is valued for its simplicity, affordability, and adaptability widespread use in measuring diffusive greenhouse gases flux from surface water, although effectiveness may vary based on design. This study investigates the effect of insulation gas accumulation. Our findings reveal that non-insulated chambers experienced greater solar heating effects their headspace, with a 20% deviation targetted water temperature. In contrast, insulated showed less than 1%...
Groundwater discharge can be a significant pathway for dissolved nutrients to surface water and thus bring forth important implications the coastal biogeochemical cycles.Discrete sampling of radon concentrations at several locations along an interridge drainage off Setiu Wetlands were carried out estimate fluxes groundwater discharge.The 222 Rn mass balance results show that in is estimated 6649 m 3 day -1 , made up ~33% total has contributed 2.88×10 2 molday 1.23×10 0.75molday...