1048 hits

Anionic surfactants are one of the pollutants derived from particulate matter (PM) and adversely afect the health of living organisms. In this study, the compositions of surfactants extracted from PM and vehicle soot collected in an urban area were investigated. A high-volume air sampler was used to collect PM sample at urban area based on coarse (>1.5 µm) and fne (..

809 hits

Surfactant is one of the pollutants derived from atmospheric aerosol that can adversely affect the human health and environment. This study aims to characterize the level of anionic surfactants as Methylene Blue Active Substances (MBAS) and Linear Alkylbenzene Sulphonates (LAS) extracted from atmospheric aerosol from urban (Kuala Lumpur) and suburban (Bangi) area of Malaysia. For aerosol sampling, a high volume sampler (HVAS) with a cascade impactor was used to collect atmospheric aerosol sample according to particle size (coarse mode (>1.5 �m) and fine mode ( 0.05). From this study, it can be concluded that MBAS concentrations in urban and suburban atmosphere are not fully affected by commercial LAS. Majority of MBAS may be presented from other natural activities and anthropogenic sources such as motor vehicle emission, combustion of biomass, and the earth's crust. The management of surfactants? use needs to be reconsidered to enhance a better atmosphere especially in urban and subu.....

755 hits

This research delves into the psycholinguistic profiles of proficient and struggling readers among junior secondary Tamil students in Sri Lanka, with the aim of enhancing literacy instruction and intervention. Grounded in the Simple View of Reading (SVR) Theory, the study explores distinct psycholinguistic profiles and predictive factors for reading success or challenges. The research involves 140 carefully chosen students; 70 struggling readers and 70 good readers were identified based on their performance in the national Grade 5 Scholarship exam of 2021 in Puttalam South Divisional Education. A psycholinguistic screening test (PST) aligning with the SVR framework was employed to evaluate decoding and linguistic comprehension skills. The data analysis reveals notable disparities in decoding and linguistic comprehension skills between proficient and struggling readers. Linear regression analysis yields a robust model, elucidating a substantial portion of the variance in the PST profile.....

187 hits