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81.
Dutta Nalok Usman Muhammad Ashraf Muhammad Awais Luo Gang Gamal El-Din Mohamed Zhang Shicheng 《Environmental Chemistry Letters》2023,21(2):803-820
Environmental Chemistry Letters - In the context of climate change and the circular economy, there is an urgent need to develop biofuels and value-added chemicals from lignocellulosic waste such as... 相似文献
82.
Ashraf W Seddigi Z Abulkibash A Khalid M 《Environmental monitoring and assessment》2006,117(1-3):271-279
In the present paper, seven heavy metals (Pb, Cd, Ni, Cu, Zn, Cr and Fe) in canned salmon, sardine and tuna fish were determined
by using atomic absorption spectroscopy. Cadmium and lead levels were determined by graphite tube AAS whereas Ni, Cu, Cr and
Fe were determined by flame AAS. Analytical results were validated by spiking the samples with various concentrations of these
metals for recovery. The metal contents, expressed in μg/g, wet weight, varied depending upon the specie studied. The levels
of Pb ranged from 0.03–1.20 μg-g−1 with an average of 0.313 μg-g−1 for salmon; 0.03–0.51 μg-g−1 with an average of 0.233 μg-g−1 for tuna and 0.13–1.97 μg-g−1 with an average of 0.835 μg-g−1 for sardines. The levels of Cd ranged from 0.02–0.38 μg-g−1 with an average of 0.161 μg-g−1 for salmon; 0.07–0.64 μg-g−1 with an average of 0.227 μg-g−1 for tuna and 0.010–0.690 μg-g−1 with an average of 0.183 μg-g−1 for sardines. Comparative evaluation of these metals in three varieties of fish showed that average concentration of lead
in sardines is about 4 times and Ni about 3 times higher as compared to tuna. Generally, the levels of these metals follow
the order sardine > salmon > tuna. The data generated in the present study compared well with the similar studies carried
out in different parts of the world. The results indicate that canned fish, in general and tuna in particular, have concentrations
within permissible limits of WHO/FAO levels for these heavy metals. Therefore, their contribution to the total body burden
of these metals can be considered as negligibly small. 相似文献
83.
Calcium amendment improved the performance of fragrant rice and reduced metal uptake under cadmium toxicity 总被引:2,自引:0,他引:2
Kanu Adam Sheka Ashraf Umair Mo Zhaowen Sabir Sabeeh-ur-Rasool Baggie Idris Charley Christen Shaka Tang Xiangru 《Environmental science and pollution research international》2019,26(24):24748-24757
Environmental Science and Pollution Research - Cadmium (Cd) toxicity has detrimental effects on plant metabolism and yield formation. This study examined the effects of Cd stress in rice and the... 相似文献
84.
Suzanne Christine Aboudi Mana Ng Tham Fatt Muhammad Aqeel Ashraf 《Environmental science and pollution research international》2017,24(29):22799-22807
The field of arsenic pollution research has grown rapidly in recent years. Arsenic constitutes a broad range of elements from the Earth’s crust and is released into the environment from both anthropogenic and natural sources due to its relative mobility under different redox conditions. The toxicity of arsenic is described in its inorganic form, as inorganic arsenic compounds can leach into different environments. Sampling was carried out in the Bestari Jaya catchment while using a land use map to locate the site, and experiments were conducted via sequential extraction and inductively coupled plasma optical emission spectroscopy to quantify proportions of arsenic in the sediment samples. The results show that metals in sediments of nonresidual fractions, which are more likely to be likely released into aquatic environments, are more plentiful than the residual sediment fractions. These findings support the mobility of heavy metals and especially arsenic through sediment layers, which can facilitate remediation in environments heavily polluted with heavy metals. 相似文献
85.
Ebaid Hossam Abd Rabou Abdel-Mageed Ahmed Al-Tamimi Jameel Homoud Hassan Iftekhar Rady Ahmed Mostafa El-Newehy Mohamed Hassan Mashaly Ashraf Mohamed Abdel-Megeed Ahmed AbdelFattah Mahmoud Alhazza Ibrahim Abdel-Halim Essam Sayed Salem Abdelfattah Zeidan Mohamed 《Environmental science and pollution research international》2020,27(32):40009-40019
Environmental Science and Pollution Research - Oil spills can result in significant damage to marine estuaries, rivers, lakes, wetlands, and shorelines. Electrospun nanofibers containing... 相似文献
86.
This paper illustrates the result of land use/cover change in Dhaka Metropolitan of Bangladesh using topographic maps and multi-temporal remotely sensed data from 1960 to 2005. The Maximum likelihood supervised classification technique was used to extract information from satellite data, and post-classification change detection method was employed to detect and monitor land use/cover change. Derived land use/cover maps were further validated by using high resolution images such as SPOT, IRS, IKONOS and field data. The overall accuracy of land cover change maps, generated from Landsat and IRS-1D data, ranged from 85% to 90%. The analysis indicated that the urban expansion of Dhaka Metropolitan resulted in the considerable reduction of wetlands, cultivated land, vegetation and water bodies. The maps showed that between 1960 and 2005 built-up areas increased approximately 15,924 ha, while agricultural land decreased 7,614 ha, vegetation decreased 2,336 ha, wetland/lowland decreased 6,385 ha, and water bodies decreased about 864 ha. The amount of urban land increased from 11% (in 1960) to 344% in 2005. Similarly, the growth of landfill/bare soils category was about 256% in the same period. Much of the city's rapid growth in population has been accommodated in informal settlements with little attempt being made to limit the risk of environmental impairments. The study quantified the patterns of land use/cover change for the last 45 years for Dhaka Metropolitan that forms valuable resources for urban planners and decision makers to devise sustainable land use and environmental planning. 相似文献
87.
This paper presents the chemical speciation and retention behavior of chromium (Cr), nickel (Ni), and cadmium (Cd) prior to
and after the electrokinetic remediation in glacial till soil. The speciation of the metals was predicted using the chemical
speciation program MINEQL+. The simulations were performed for single-contaminant with only Cr(VI) or Ni, and multi-contaminants consisting of: (1)
Cr(VI), Ni, and Cd; (2) Cr(III), Ni and Cd; (3) Cr(VI), Cr(III), Ni and Cd; (4) Cr(VI), Ni, and Cd with reducing agents; and
(5) Cr(III), Ni, and Cd with oxidizing agent (Mn). The results showed that the speciation and distribution of cationic metals
[Ni, Cd, and Cr(III)] in glacial till soil remain unaffected or slightly affected during electrokinetics. This is attributed
to the high pH buffering capacity of the glacial till, leading the metals to precipitate in the soil prior to and after electrokinetics.
This study showed that during electrokinetics, Cr(VI) existed as anionic complex and migrated towards the anode and the migration
is maximum in case of a single-contaminant system. The study also showed that near the anode in the absence of any reducing
and oxidizing agent, Cr(VI) mostly adsorbed, and some of Cr(VI) reduced to Cr(III) and migrated towards the cathode and finally
precipitated due to high pH conditions. Ni and Cd remain adsorbed or precipitated due to the high pH conditions throughout
the soil. Among the reducing agents, the sulfide had significant effect on the migration of metals compared to ferrous ions.
While in the presence of oxidizing agent (Mn), no noticeable Cr(VI) was found in the soil sample indicating the reduction
of Cr(VI) to Cr(III) and the predominance of reducing conditions due to the presence of naturally occurring iron in the glacial
till soil. Overall, this study provides a reasonable explanation of the speciation and distribution of chromium, nickel and
cadmium during the electrokinetic remediation of glacial till soil. 相似文献
88.
Zulfiqar Ahmad Gulraiz Akhter Arshad Ashraf Alan Fryar 《Environmental monitoring and assessment》2010,170(1-4):395-406
A three-dimensional contaminant transport model has been developed to simulate and monitor the migration of disposal of hydrocarbon exploration produced water in Injection well at 2,100 m depth in the Upper Cretaceous Pab sandstone, Bhit area in Dadu district of Southern Pakistan. The regional stratigraphic and structural geological framework of the area, landform characteristics, meteorological parameters, and hydrogeological milieu have been used in the model to generate the initial simulation of steady-state flow condition in the underlying aquifer’s layers. The geometry of the shallow and deep-seated characteristics of the geological formations was obtained from the drilling data, electrical resistivity sounding surveys, and geophysical well-logging information. The modeling process comprised of steady-state simulation and transient simulation of the prolific groundwater system of contamination transport after 1, 10, 30 years of injection. The contaminant transport was evaluated from the bottom of the injection well, and its short- and long-term effects were determined on aquifer system lying in varying hydrogeological and geological conditions. 相似文献
89.
Environmental Science and Pollution Research - Ethephon is an organophosphorus plant growth regulator used to accelerate the ripening process and decrease the duration of cultivation. Here, the... 相似文献
90.