Article
Chemistry, Applied
Sharmila Karunarathna, Sudarshana Somasiri, Ranjith Mahanama
Summary: This study explores the seasonal variation of minerals and possible health risks due to toxic heavy metal contamination in selected rice varieties in Sri Lanka. The results show that the analyzed rice varieties have lower concentrations of heavy metals than the safety standards, indicating their suitability for human consumption. The study also demonstrates the significant impact of cultivation seasons on the mineral profile of rice.
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
(2022)
Article
Environmental Sciences
Hsueh-Han Hsieh, Ming-Hsiu Chuang, Yung-Yen Shih, W. Sanjaya Weerakkody, Wei-Jen Huang, Chin-Chang Hung, Francois L. L. Muller, R. R. M. K. P. Ranatunga, D. S. Wijethunga
Summary: This study examined eutrophication and hypoxia in the Negombo Lagoon of Sri Lanka, finding that the main contributing factors were high population pressure and poor water circulation leading to these events.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Meteorology & Atmospheric Sciences
Wan-Ru Huang, Suranjith Bandara Koralegedara, Po-Han Tung, Tzu-Yang Chiang
Summary: This study analyzes the diurnal rainfall characteristics and their seasonality over Sri Lanka, the second-largest island in the tropical Indian Ocean, and explores the possible causes. The results indicate that diurnal rainfall peaks occur at 12 UTC in all seasons, with larger amplitudes in spring and autumn. The dominant propagation direction of diurnal rainfall is eastward in summer and westward in spring, autumn, and winter. Atmospheric modulations contribute to the transport of moisture from nearby seas to Sri Lanka and lead to the diurnal rainfall peaks. The differences in diurnal rainfall propagation over Sri Lanka are attributed to various factors, including the interaction between land-sea breezes, orography, and prevailing low-to-mid-level winds.
ATMOSPHERIC RESEARCH
(2023)
Article
Environmental Sciences
Chakresh Kumar, Anwesha Ghosh, Yash, Manojit Debnath, Punyasloke Bhadury
Summary: This study monitored nine sites along the lower stretch of the River Ganga to understand the impact of untreated sewage and pollutants on water quality during monsoonal precipitation. The environmental variables such as water temperature, dissolved oxygen, pH, and TDS were influenced by the monsoon, with higher levels of dissolved nutrients observed in point source stations. The Water Quality Index values revealed poor water quality in most stations, showing no significant influence from monsoonal precipitation.
ENVIRONMENTAL RESEARCH COMMUNICATIONS
(2021)
Article
Environmental Sciences
Teresa Aguirrezabala-Campano, Rodrigo Gonzalez-Valencia, Viani Garcia-Perez, Rocio Torres-Alvarado, Sunitha R. Pangala, Frederic Thalasso
Summary: This study provides a detailed characterization of the methane cycle in a tropical coastal lagoon and its tributary river in Mexico, showing that both the river and the lagoon are net sources of methane and carbon dioxide.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Public, Environmental & Occupational Health
Ushani Atapattu, Anson V. Koehler, Lucas G. Huggins, Anke Wiethoelter, Rebecca J. Traub, Vito Colella
Summary: Sri Lanka has successfully eliminated lymphatic filariasis as a public health concern, but recent infections with subperiodic filarial species suggestive of zoonotic infections have been found in dogs across the country. Limited information on the prevalence, diversity, and predictors of filarial infections in dogs has resulted in suboptimal control and prevention of these parasites.
Article
Limnology
Guoqing Han, Changming Dong, Jingsong Yang, Yu Liu
Summary: The study reveals that Sri Lanka seasonal warm pools (SSWPs) with high sea surface temperature (SST) are related to El Nino-Southern Oscillation (ENSO) events. The wind intensity on the leeward side of Sri Lanka is weakened, reducing evaporation and oceanic mixing, resulting in higher SST. Background currents play important roles in governing the SSWPs intensities through the heat advection.
JOURNAL OF OCEANOLOGY AND LIMNOLOGY
(2021)
Article
Multidisciplinary Sciences
Pasan Herath, Januka Attanayake, Kalpna Gahalaut
Summary: Anomalous seismic activity exceeding the national background seismic rate was observed around the Victoria Reservoir in Sri Lanka. The study detected a previously unnoticed seismic swarm and established a causal relationship between the reservoir-induced stresses and the earthquake swarm. The study also provided a low-cost workflow for monitoring reservoir-induced seismicity in developing countries.
SCIENTIFIC REPORTS
(2022)
Article
Public, Environmental & Occupational Health
Lahiru Sandaruwan Galgamuwa, Nishan Madhushanka Liyanawahunge, Chamilka Gayashini Ratnayake, Navodi Mekala Hakmanage, Fahim Aslam, Samath D. Dharmaratne
Summary: This study analyzes the trends and patterns of COVID-19 epidemiology in Sri Lanka, finding that the Western and Southern regions are high-risk areas for COVID-19, and there has been a decreasing trend of COVID-19 cases in all provinces after September 2021. Public awareness programs for prevention and control are crucial in endemic regions.
Article
Environmental Sciences
Sumudu Senanayake, Biswajeet Pradhan, Alfredo Huete, Jane Brennan
Summary: This study investigated climate and human-induced soil erosion in the Central Highlands of Sri Lanka through spatial modeling and time-series analysis. The results showed an increase in soil erosion, annual rainfall, and erosion hazards, along with a decrease in crop diversity in the farming systems. Climate-induced soil erosion was identified as the cause of land degradation in the region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Meteorology & Atmospheric Sciences
Chanud n. Yasanayake, Benjamin f. Zaitchik, Anand Gnanadesikana
Summary: This study investigates the influence of the Madden-Julian oscillation (MJO) on precipitation in Sri Lanka. The research finds a direct impact of MJO on precipitation, corresponding to the propagation of MJO's convectively active and suppressed regions near Sri Lanka, with varying strength and spatial patterns across seasons. The study also reveals significant associations between MJO phase and Sri Lankan precipitation at time scales of up to several weeks.
JOURNAL OF CLIMATE
(2023)
Article
Environmental Sciences
Wentao Ma, Yuntao Wang, Yan Bai, Xiaolin Ma, Yi Yu, Zhiwei Zhang, Jingyuan Xi
Summary: Multiple upwelling systems develop in the Indian Ocean during the summer monsoon. The Sri Lanka dome (SLD) is a distinct upwelling system characterized by uplifted thermocline and increased chlorophyll concentration. The dynamics of chlorophyll and sea-to-air CO2 flux in the SLD are influenced by the pathway of the southwest monsoon current (SMC) and other factors such as eddy activity and frontal processes. The SLD is a net carbon source to the atmosphere due to upwelling and sub-mesoscale processes.
Article
Environmental Sciences
Sansfica M. Young, H. Ishiga
Summary: The study reveals significant variations in the chemical compositions of water and soil in the Polpithigama area, mainly influenced by fluoride and phosphate concentrations. High levels of fluoride and phosphate are predominantly found in the surface soils, and exhibit distinct variations at different elevations.
WATER AIR AND SOIL POLLUTION
(2021)
Article
Environmental Sciences
Kai Wang, Yu Pang, Chen He, Penghui Li, Shangbin Xiao, Quan Shi, Ding He
Summary: Hydrological alterations induced by Three Gorges Reservoir construction resulted in variations in DOM molecular composition between reservoir area and non-reservoir area in the Xiangxi tributary. Water intrusion from mainstream to tributaries was found to be the main factor controlling DOM variation, highlighting the important role of reservoir in DOM cycling.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Thanippuli Arachchige Nilusha Tharangani Perera, Herath Mudiyanselage Malhamige Sonali Dinesha Herath, Ranjana Udaya Kumara Piyadasa, Liu Jianhui, Li Bing
Summary: The study examined groundwater quality in Sri Lanka's urban coastal region, revealing issues such as elevated EC and turbidity levels in some samples. The main hydrochemical facies detected in groundwater samples were Na+- Cl- and the mixed Ca2+- Mg2+- Cl- face, with water-rock interaction identified as the main controlling mechanism. High HQ levels were reported in a significant portion of the population, indicating a health hazard, highlighting the need for comprehensive groundwater management strategies.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
K. S. D. Premarathna, Anushka Upamali Rajapaksha, Nadeesh Adassoriya, Binoy Sarkar, Narayana M. S. Sirimuthu, Asitha Cooray, Yong Sik Ok, Meththika Vithanage
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2019)
Article
Biotechnology & Applied Microbiology
S. K. T. Thathsara, Asitha T. Cooray, Dilru R. Ratnaweera, Thilini Kuruwita Mudiyanselage
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2019)
Article
Engineering, Environmental
Sammani Ramanayaka, Binoy Sarkar, Asitha T. Cooray, Yong Sik Ok, Meththika Vithanage
JOURNAL OF HAZARDOUS MATERIALS
(2020)
Article
Environmental Sciences
Viraj Gunarathne, Anushka Upamali Rajapaksha, Meththika Vithanage, Nadeesh Adassooriya, Asitha Cooray, Sudantha Liyanage, Bandunee Athapattu, Nishanta Rajakaruna, Avanthi Deshani Igalavithana, Deyi Hou, Daniel S. Alessi, Yong Sik Ok
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Chemistry, Analytical
Sakuni M. De Silva, Samitha Deraniyagala, Janitha K. Walpita, Indira Jayaweera, Saranga Diyabalanage, Asitha T. Cooray
JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY
(2020)
Article
Engineering, Environmental
Prabuddhi Wijekoon, Pabasari Arundathi Koliyabandara, Asitha T. Cooray, Su Shiung Lam, Bandunee C. L. Athapattu, Meththika Vithanage
Summary: The increasing amount of municipal solid waste ending up in open dumps and landfills results in continuous leachate flow, creating environmental risks. Evaluation through Leachate Pollution Index (LPI) shows high pollution potentials from leachate in most developing countries, mainly due to high organic waste composition and low waste management techniques.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Asitha T. Cooray, Michael J. Pullin
Summary: This article describes a method based on rFIA and FERROZINE spectrophotometric detection for quantifying total iron concentration in stream water at nanomolar concentrations. The method has a low detection limit and a wide linear dynamic range, and the rFIA manifold is assembled from commercially available components, showing its potential for practical application.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
P. A. Koliyabandara, A. T. Cooray, S. Liyanage, C. Siriwardhana
Summary: This research assesses the chemical composition of landfill leachate in Sri Lanka and its impact on groundwater pollution. The leachate from the Karadiyana dumpsite shows a high potential for contaminating the environment. The concentrations of nitrate, ammonia, and total phosphate in the leachate vary within certain ranges. The study also reveals that most of the dug wells located near the dumpsite exceed the recommended nitrate level, making them unsuitable for drinking water.
JOURNAL OF THE NATIONAL SCIENCE FOUNDATION OF SRI LANKA
(2022)
Article
Chemistry, Multidisciplinary
Asitha Tharanga Cooray, Chamika Siriwardana, Pabasari Arundathi Koliyabandara, Sudantha Liyanage
Summary: This study investigated the water quality of Padaviya Wewa Reservoir in Sri Lanka and found a distinct chemical gradient from the surface to the bottom, driven by intense biological activities. The surface waters were oxygen-rich with low concentrations of nutrients and metal ions, while the bottom waters were oxygen-depleted with higher concentrations of nutrients and metal ions.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Nipuni N. Vitharana, Chiranthi Kaushalya, Theshini Perera, Samitha P. Deraniyagala, W. M. C. Sameera, Asitha T. Cooray
Summary: Two ligand systems, L1 and L2, have been synthesized and can be used as sensors for detecting Fe3+. L2 demonstrates high photostability and low detection limit.
Article
Plant Sciences
K. D. Munugoda, T. S. Talagala, S. M. C. U. P. Subasinghe, D. S. Hettiarachchi, A. T. Cooray
Summary: Tropical countries face economic losses due to mosquito-borne diseases, which can be combatted with plant-based mosquito repellents. A questionnaire survey in Sri Lanka identified the top 25 underutilized aromatic plants with mosquito repellent ability and assessed the rural sector's willingness to cultivate and supply them. The study found significant associations between gender, education level, and willingness to cultivate and supply these plants.
Article
Multidisciplinary Sciences
A. Fernando, S. Liyanage, A. T. Cooray
Summary: This research evaluated the fluoride concentrations of twenty natural water samples using SPADNS and Eriochrome Cyanine R colorimetric methods, and found significant differences in the fluoride concentrations produced by these two methods. The potential interferences of Al3+, Ca2+, and Mg2+ ions on fluoride analysis were also assessed, with Al3+ ions causing the highest interference. Acid distillation was effective in increasing fluoride concentrations, but statistically comparable fluoride concentrations were not observed even after the distillation process.
JOURNAL OF THE NATIONAL SCIENCE FOUNDATION OF SRI LANKA
(2023)
Proceedings Paper
Engineering, Multidisciplinary
Kusalvin Dabare, Prabuddhi Wijekoon, Asitha Cooray, B. C. L. Athapattu, Meththika Vithanage
Summary: The study focuses on treating landfill leachate using a pilot scale biochar based barricade and wetland system, which showed high removal rates for ammonium-N, phosphate, and COD. Further improvements through testing different ratios of biochar and leachate flow rates are suggested for potential upscaling of the system.
MORATUWA ENGINEERING RESEARCH CONFERENCE (MERCON 2021) / 7TH INTERNATIONAL MULTIDISCIPLINARY ENGINEERING RESEARCH CONFERENCE
(2021)
Meeting Abstract
Chemistry, Multidisciplinary
Vidumini Samarasiri, Upul Kumarasinghe, Asitha Cooray
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)