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261.
Felemban Bassem F. Essa Fadl Abdelmonem Afzal Asif Ahmed Mohamed Hamza Saleh Bahaa Panchal Hitesh Shanmugan Sengottiyan Elsheikh Ammar Omara Zakaria Mohamed 《Environmental science and pollution research international》2022,29(42):63248-63259
Environmental Science and Pollution Research - The shortage of potable water is a global problem. One of the techniques used to participate solving this problem is the solar distiller. The main... 相似文献
262.
Bhatia Saurabh Al-Harrasi Ahmed Behl Tapan Anwer Md. Khalid Ahmed Mohammed Muqtader Mittal Vineet Kaushik Deepak Chigurupati Sridevi Kabir Md. Tanvir Sharma Pritam Babu Chaugule Bhupal Vargas-de-la-Cruz Celia 《Environmental science and pollution research international》2022,29(10):14380-14392
Environmental Science and Pollution Research - Several studies have suggested the direct relationship between skin complications, air pollution, and UV irradiation. UVB radiations cause various... 相似文献
263.
Biswas Manik Chandra Jony Bodiuzzaman Nandy Pranab Kumar Chowdhury Reaz Ahmed Halder Sudipta Kumar Deepak Ramakrishna Seeram Hassan Masud Ahsan Md Ariful Hoque Md Enamul Imam Muhammad Ali 《Journal of Polymers and the Environment》2022,30(1):51-74
Journal of Polymers and the Environment - Recently, the advantages of biopolymers over conventional plastic polymers are unprecedented, provided that they are used in situations in which they raise... 相似文献
264.
Jawad Ali H. Abdulhameed Ahmed Saud Kashi Elmira Yaseen Zaher Mundher ALOthman Zeid A. Khan Mohammad Rizwan 《Journal of Polymers and the Environment》2022,30(1):164-178
Journal of Polymers and the Environment - Kaolin clay (KN) was employed as an inorganic filler to modify a cross-linked chitosan-glyoxal as Schiff’s-based chitosan composite derivative... 相似文献
265.
C.L. Schultz S.N. Ahmed R. Mandel H.L.N. Moltz 《Journal of the American Water Resources Association》2014,50(4):909-927
We have enhanced the ability of a widely used watershed model, Hydrologic Simulation Program — FORTRAN (HSPF), to predict low flows by reconfiguring the algorithm that simulates groundwater discharge. During dry weather periods, flow in most streams consists primarily of base flow, that is, groundwater discharged from underlying aquifers. In this study, HSPF's groundwater storage‐discharge relationship is changed from a linear to a more general nonlinear relationship which takes the form of a power law. The nonlinear algorithm is capable of simulating streamflow recession curves that have been found in some studies to better match observed dry weather hydrographs. The altered version of HSPF is implemented in the Chesapeake Bay Program's Phase 5 Model, an HSPF‐based model that simulates nutrient and sediment loads to the Chesapeake Bay, and is tested in the upper Potomac River basin, a 29,950 km2 drainage area that is part of the Bay watershed. The nonlinear relationship improved median Nash‐Sutcliffe efficiencies for log daily flows at the model's 45 calibration points. Mean absolute percent error on low‐flow days dropped in five major Potomac River tributaries by up to 12 percentage points, and in the Potomac River itself by four percentage points, where low‐flow days were defined as days when observed flows were in the lowest 5th percentile range. Percent bias on low‐flow days improved by eight percentage points in the Potomac River, from ?11 to ?3%. 相似文献
266.
Adel?R.?A.?Usman Mahtab?Ahmad Mohamed?El-Mahrouky Abdulrasoul?Al-Omran Yong?Sik?Ok Abdelazeem?Sh.?Sallam Ahmed?H.?El-Naggar Mohammad?I.?Al-WabelEmail author 《Environmental geochemistry and health》2016,38(2):511-521
Biochar has emerged as a universal sorbent for the removal of contaminants from water and soil. However, its efficiency is lower than that of commercially available sorbents. Engineering biochar by chemical modification may improve its sorption efficiency. In this study, conocarpus green waste was chemically modified with magnesium and iron oxides and then subjected to thermal pyrolysis to produce biochar. These chemically modified biochars were tested for NO3 removal efficiency from aqueous solutions in batch sorption isothermal and kinetic experiments. The results revealed that MgO-biochar outperformed other biochars with a maximum NO3 sorption capacity of 45.36 mmol kg?1 predicted by the Langmuir sorption model. The kinetics data were well described by the Type 1 pseudo-second-order model, indicating chemisorption as the dominating mechanism of NO3 sorption onto biochars. Greater efficiency of MgO-biochar was related to its high specific surface area (391.8 m2 g?1) and formation of strong ionic complexes with NO3. At an initial pH of 2, more than 89 % NO3 removal efficiency was observed for all of the biochars. We conclude that chemical modification can alter the surface chemistry of biochar, thereby leading to enhanced sorption capacity compared with simple biochar. 相似文献
267.
Ahmed A. Almohandis 《毒物与环境化学》2013,95(3):197-206
This paper presents the results of chemical analysis of four drinking waters from the Khaybar village, SW Saudi Arabia. Four main water‐wells in the Khaybar village were investigated. The Khaybar ground water is clear without odour but its taste differs according to the amount of total dissolved solids (T.D.S.). The pH values of such water are slightly alkaline. T.D.S. of the Khaybar water is higher than the Saudi highest desired level, but it is generally within the Saudi maximum permissible level. Good drinking quality water can be found in Al Mazaab and Al Tilah water‐wells in the Khaybar village. The other two water‐wells can be used for irrigation purposes only. The geological features of the Khaybar area suggest a meteoric origin for the Khaybar ground water which has been stored in the fractured metamorphic and igneous rocks and in alluvial deposits. 相似文献
268.
Food is the major source of metal exposure for the nonsmoking general population. Food samples of plant and animal origin from Ismailia, Egypt, were analyzed for the content of cadmium (Cd), lead (Pb), chromium (Cr), zinc (Zn), and copper (Cu) using AAS. The Cr, Zn, and Cu concentrations were in the range of 1.7–249?µg?kg?1 wet weight (ww), 2–66?mg?kg?1?ww, and 0.5–3.46?mg?kg?1?ww, respectively. The mean daily intake of Cr, Zn, and Cu was 28.9?µg day?1, 8.55?mg day?1, and 1.7?mg day?1, respectively. The intake estimates are within the range of the recommended intake established internationally. Concentrations of Cd and Pb were in the range of 10–321?µg?kg?1?ww and 31–1200?µg?kg?1?ww, respectively. The weekly dietary intake for Cd and Pb (4.02 and 20.4?µg?kg?1 b.w, respectively) is lower than the FAO/WHO PTWI. Bread is the foodstuff that provided the highest rate of Pb and Cd (62 and 46% of the daily intake) to adults in Ismailia city. 相似文献
269.
A total of 50 blood samples were collected from auto rickshaw drivers who were exposed to environmental gasoline in different sites of Dir (L), Khyber Pukhtunkhwa, Pakistan, in July and August, 2009. Control group was selected among the individuals who were not regularly exposed to gasoline emissions. The samples were analyzed for calcium, cholesterol, glucose, phosphorus, potassium, and triglycerides levels. A significant increase was found in the blood levels of calcium, glucose, phosphorus, and triglycerides. A significant decrease was detected in the blood levels of potassium without any significant effect on the blood levels of cholesterol and magnesium. 相似文献
270.
Shahid Mahboob H.F. Alkkahem Al-Balwai K.A. Al-Ghanim F. Al-Misned Z. Ahmed El-Amin M. Suliman 《毒物与环境化学》2013,95(4):624-632
Antioxidant enzyme activities of fish (Oreochromis niloticus) were determined in order to assess the status of pollution in the Wadi Namar (WN), near Riyadh, Saudi Arabia. Activities of four antioxidant enzymes as superoxide dismutase (SOD), catalase (CAT), glutathione S-transferase (GST), and concentrations of glutathione (GSH) and oxidant malondialdehyde (MDA) were selected as bioindicators. Fish (n = 14) were sampled in the month of April 2013 from WN and a control site (CS). SOD activity was increased by 37.9%, 47%, and 29% in kidney, liver, and heart, respectively, while a significant decrease (36.4%) was observed in gills of O. niloticus from WN as compared to fish from CS. CAT activity was reduced by 51%, 55%, 47%, and 35% in kidney, liver, heart, and gills of O. niloticus from WN. The GST activities in kidney, liver, and heart of O. niloticus from WN were elevated by 34%, 48%, and 32%, respectively. However, significant fall (49%) in gills of fish was noted from WN compared to fish from CS. GSH levels were increased by 44%, 36%, and 38% in kidney, liver, and heart, respectively, but decreased by 30% in gills. MDA levels of O. niloticus were significantly increased in kidney, liver, and heart in fish from WN. Data indicated that WN is polluted mainly by industrial and urban discharge of liquid waste products. 相似文献