Browsing by Author "Kabir, Md Humayun"

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Effects of Microplastic and Heavy Metals on Coral Reefs
(Elsevier, 2023-11-19) Islam, Md Saiful; Islam, Abu Reza Md Towfiqul; Ismail, Zulhilmi; Ahmed, Md Kawser; Ali, Mir Mohammad; Kabir, Md Humayun; Ibrahim, Khalid A.; Al-Qthanin, Rahmah N.; Idris, Abubakr M.
In the modern world, plastic trash has been recognized as a global issue, and studies on microplastics (MPs) in the marine and inland environments have previously been conducted. Marine ecosystems act as a bio-diverse ecosystem where coral reefs contribute to make a sound living of the coastal people by gathering natural resources. The current study indicates that MPs and heavy metals (HMs) accumulation to biofilm and organic matter through sedimentation, precipitation, adsorption, and desorption that may have potential effect on growth and development of coral reefs in the marine ecosystems. However, the knowledge of distribution, impact, mechanism, degradation, and association mechanisms between MPs and HMs in the natural environment may open a new window for conducting analytical research from an ecological viewpoint. The current study thus summarizes the types of marine samples with the analytical techniques, polymers of MPs, and their impact on corals and other marine biota. This study also identifies existing knowledge gaps and recommends fresh lines of inquiry in light of recent developments in MPs and HMs research on the marine ecosystems. Overall, the present study suggests a sustainable intervention for reducing MPs and HMs from the marine ecosystems by demonstrating their existence in water, sediment, fish, corals, and other biota, and their impending ecotoxicological impacts on the environment and human health. The impacts of MPs and HMs on coral reefs are critically assessed in this study in light of the most recent scientific knowledge, existing laws, and new suggestions to minimize their contamination in the marine ecosystems.
Layer-Wise Physicochemical and Elemental Distribution in an Urban River Water, Bangladesh: Potential Pollution, Sources, and Human Health Risk Assessment
(The Royal Society of Chemistry, 2023-08-03) Kormoker, Tapos; Islam, Md. Saiful; Siddique, Md. Abu Bakar; Kumar, Sazal; Phoungthong, Khamphe; Kabir, Md Humayun; Iqubal, Kazi Farhed; Kumar, Rakesh; Alij, Mir Mohammad; Islam, Abu Reza Md. Towfiqul
Buriganga is an economically important river located around the industrialized urban area of Dhaka City, Bangladesh. In this study, 17 water quality parameters (electrical conductivity, pH, total suspended solids, temperature, F−, Cl−, SO42−, Cr, Ni, As, Cd, Hg, Cu, Pb, Fe, Mn, and Zn) of surface and deep waters of the Buriganga River were measured to assess the water quality, pollution level, elemental sources, and their potential ecological and human health risks. Comparing the concentrations of the analyzed parameters with the permissible standards, it was indicated that the water in Buriganga is unsafe for residential and recreational uses. Principal component and correlation analysis revealed that point and diffuse sources, such as the combustion of lubricant oils, fuel additives, exhaust fumes from vehicles, domestic wastewater, and inorganic fertilizers from agricultural fields, control the water quality. Regardless of depth, a higher degree of contamination and ecological risk was observed during the dry season, indicating a higher content of heavy metals in river water, which might impact the ecological balance in the future. Through ingestion, the hazard quotient (HQ) of As, Cd, Pb, and Hg and the hazard index (HI) values were higher than the risk threshold (HQ > 1). Total HI values for children in both residential and recreational water were higher than those for adults (1.04 × 101 and 1.73 × 100 for surface and deep water, respectively), indicating that children are more sensitive to elemental contamination. Total carcinogenic risks of Cr and As due to exposure to water were higher than the standard limit (>1.0 × 10−4), which indicated possible cancer risks to the inhabitants around the river. Therefore, regular monitoring of river water quality and sustainable management could be implemented to recover the polluted river water and keep it pollution-free in the future. © 2023 RSC.
Security System using Smart Card Technology
(2014-07-07) Kabir, Md Humayun; Alam, Md Asraful
Newly, smart card technology are bring used in a number of around the world, on the other hand security has become significant in information technology. But there are few sectors in our country where security system has been adopted. Security system is more acceptable to the technologically unskilled people. Security system is the main concern of this project. The purpose of this project is to become familiar with the implementation of developing a security system. We used smart card with LDR using optoelectronic for security purpose and the alert will be displayed by LED and buzzer alarm. The objective of this project is to design a simple, easy to electronic circuit. It communicates with the LDR in real-time in order to control the light and buzzer alarm according to the necessary condition.