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21.
Jafon Ng Mum Zhong Mohd Talib Latif Noorlin Mohamad Nurul Bahiyah Abd Wahid Doreena Dominick Hafizan Juahir 《Environmental Forensics》2014,15(1):8-16
A study on source apportionment of indoor dust and particulate matter (PM10) composition was conducted in a university building by using chemometrics. The objective of this study was to investigate the potential sources of selected heavy metals and ionic species in PM10 and indoor dust. PM10 samples were collected using a low-volume sampler (LVS) and indoor dust was collected using a soft brush. Inductively coupled plasma spectrometry (ICP-MS) was used to determine the concentration of heavy metals, while the concentration of cations and anions was determined by atomic absorption spectrometer (AAS) and ion chromatography (IC), respectively. The concentration of PM10 recorded in the building throughout the sampling period ranged from 20 ± 10 μgm?3 to 80 ± 33 μgm?3. The composition of heavy metals in PM10 and indoor dust were dominated by zinc (Zn), followed by lead (Pb), copper (Cu), and cadmium (Cd). Principle component analysis (PCA) and multiple linear regression (MLR) showed that the main sources of pollutants in PM10 came from indoor renovations (73.83%), vehicle emissions (16.38%), earth crust sources (9.68%), and other outdoor sources (0.11%). For indoor dust, the pollutant source was mainly earth crust. This study suggests that chemometrics can be used for forensic investigation to determine the possible sources of indoor contaminants within a public building. 相似文献
22.
Mohd Talib Latif Siti Zawiyah Azmi Ahmad Daud Mohamed Noor Aida Shafawati Ismail Zaharizam Johny Shaharudin Idrus Ahmad Fariz Mohamed Mazlin Bin Mokhtar 《The Environmentalist》2011,31(3):315-324
Studies of air quality were carried out in the towns of Kajang, Nilai and Banting in the Langat River Basin, southern region of Kuala Lumpur to determine the status and trend of air quality. The determination of air quality was based on several parameters such as suspended solids with diameters less than 10???m (PM10) and gaseous pollutants of sulphur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), and carbon monoxide (CO). Primary concentration data of air pollutants were compiled through fieldwork studies and combined with secondary data obtained from the regular monitoring data as collected by Alam Sekitar Malaysia Sdn. Bhd. (ASMA) on behalf of Malaysian Department of Environment (DOE) at their stations in Kajang and Nilai. Results showed that the average concentrations of PM10, SO2, NO2, O3, and CO at all sampling stations were still below the permissible values recommended by the Malaysian DOE. The level of gaseous pollutants of NO2, O3, and CO was recorded at statistically higher levels (p?<?0.05) than values recorded at the control station at Pangsun Recreational Area. These pollutants were suspected to have originated mainly from exhaust systems of motor vehicles. Data for the years 1996 to 2006 as obtained from ASMA showed long-term air quality trends of increasing O3 and NO2 concentrations in Kajang whilst concentrations of PM10 recorded at both Kajang and Nilai stations were mostly expected coming from transboundary sources especially biomass burning and the development activities around the study areas. 相似文献
23.
Uning Royston Suratman Suhaimi Latif Mohd Talib Mustaffa Nur Ili Hamizah 《Environmental science and pollution research international》2022,29(11):15380-15390
Environmental Science and Pollution Research - Terrestrial anionic surfactants (AS) enter the marine environment through coastal region. Despite that, in general limited knowledge is available on... 相似文献
24.
Khomri Zine-eddine Chabaca Mohamed Naçer Boudibi Samir Latif Sarmad Dashti 《Environmental monitoring and assessment》2022,194(7):1-20
Environmental Monitoring and Assessment - Downstream water pollution resulting from anthropogenic pressures on upstream water can cause conflicts, especially in transboundary rivers basins. This... 相似文献
25.
Ehteram Mohammad Ahmed Ali Najah Latif Sarmad Dashti Huang Yuk Feng Alizamir Meysam Kisi Ozgur Mert Cihan El-Shafie Ahmed 《Environmental science and pollution research international》2021,28(2):1596-1611
Environmental Science and Pollution Research - There is a need to develop an accurate and reliable model for predicting suspended sediment load (SSL) because of its complexity and difficulty in... 相似文献
26.
Kasemy Zeinab A. Rohlman Diane S. Abdel Latif Asmaa A. 《Environmental science and pollution research international》2021,28(24):30993-31002
Environmental Science and Pollution Research - Solid waste workers are exposed to variety of injuries and diseases at work. To study health disorders among workers in the waste management field and... 相似文献
27.
Agricultural production in the state of Alabama, USA, is mostly rain-fed, because of which it is vulnerable to drought during
growing season. Since Alabama receives a significant portion of its annual precipitation during winter months, the goal of
this study was to evaluate the feasibility of water withdrawal from streams during winter months for irrigation in the growing
season. The Soil and Water Assessment Tool (SWAT) was used to estimate the quantity of water that can be sustainably withdrawn
from streams during winter high flow periods. The model was successfully calibrated and validated for surface runoff, base
flow, and total stream flow. The stream flows generated by the model at several locations within the watershed were then used
to examine how much water can be sustainably withdrawn from streams of various orders (first, second and third). Although
there was a considerable year-to-year variability in the amount of water that can be withdrawn, a 16-year average showed that
first, second, and third order streams can irrigate about 11.6, 10.3, and 10.6% of their drainage areas, respectively. The
percentage of drainage area that can be irrigated was not a function of stream order. 相似文献
28.
The objective of this study was to assess the potential of the earthworm Eiseniella tetraedra (Savigny, 1826) as a bioindicator for cadmium (Cd) and lead (Pb) exposure. The importance of earthworms in metal pollution monitoring is widely recognized in terrestrial ecosystems. In this study, the levels of Cd and Pb in soils and earthworm tissues were studied at two locations, Polur Falls and a riverside area located in Abali, in the Elburz Mountains in Iran. At both locations the concentration of Cd and Pb in earthworms was higher than in the surrounding soils and a significant difference was found between the two stations, the latter probably attributable to the (1) amount of pesticides that are used for crop treatment in Abali and (2) presence there of clay, which is known to be rich in Cd. Data indicate that E. tetraedra is an efficient bioaccumulator of Cd and Pb and might act thus serve as a bioindicator of exposure. 相似文献
29.
Ahmed I. El-Seesy Hamdy Hassan Latif Ibraheem Manzoore Elahi M Soudagar 《International Journal of Green Energy》2020,17(12):793-804
ABSTRACT The main challenge of utilizing ethanol in diesel engines in blending mode is the phase separation issue. Therefore, an attempt has been performed to enhance the stability feature of ethanol/Jatropha biodiesel (JME) blends by using n-butanol as co-solvent. The 10% by volume of n-butanol is added to the mixtures of 10% and 20% ethanol and 70% and 80% JME, which is denoted as JME10Bu10E and JME10Bu20E, respectively. The phase stability of the evaluated fuels is examined employing visual approach and Thermogravimetric analysis. These methods confirm that there is no phase separation for more than 2 months under ambient conditions. Then, the combustion and emission features are investigated utilizing a diesel engine run with different loads and constant speed. The findings demonstrate that the pmax. and HRR are increased by adding ethanol. The ignition delay is extended with the addition of ethanol while the combustion period is almost the same. The bsfc is decreased by adding ethanol compared to JME fuel. The CO, UHC, and NOx formations are reduced markedly by 40%, 40%, and 40%, respectively, with adding ethanol. Finally, using n-butanol and JME as co-solvents with ethanol supports the growth of renewable energy in the CI engine. 相似文献
30.
This study investigated potential changes in flow, total suspended solid(TSS) and nutrient(nitrogen and phosphorous) loadings under future climate change, land use/cover(LULC)change and combined change scenarios in the Wolf Bay watershed, southern Alabama,USA. Four Global Circulation Models(GCMs) under three Special Report Emission Scenarios(SRES) of greenhouse gas were used to assess the future climate change(2016–2040). Three projected LULC maps(2030) were employed to reflect different extents of urbanization in future. The individual, combined and synergistic impacts of LULC and climate change on water quantity/quality were analyzed by the Soil and Water Assessment Tool(SWAT).Under the "climate change only" scenario, monthly distribution and projected variation of TSS are expected to follow a pattern similar to streamflow. Nutrients are influenced both by flow and management practices. The variation of Total Nitrogen(TN) and Total Phosphorous(TP) generally follow the flow trend as well. No evident difference in the N:P ratio was projected. Under the "LULC change only" scenario, TN was projected to decrease,mainly due to the shrinkage of croplands. TP will increase in fall and winter. The N:P ratio shows a strong decreasing potential. Under the "combined change" scenario, LULC and climate change effect were considered simultaneously. Results indicate that if future loadings are expected to increase/decrease under any individual scenario, then the combined change will intensify that trend. Conversely, if their effects are in opposite directions, an offsetting effect occurs. Science-based management practices are needed to reduce nutrient loadings to the Bay. 相似文献