排序方式: 共有67条查询结果,搜索用时 93 毫秒
21.
Arifeen Waseem-ul- Rehman Fazal-Ur- Adeel Shahid Zuber Muhammad Ahmad Mirza Nadeem Ahmad Tanvir 《Environmental science and pollution research international》2021,28(36):49958-49966
Environmental Science and Pollution Research - Environmental friendly products particularly natural dyes are going to be much popular around the globe due to their non-toxic and bio-degradable... 相似文献
22.
Rawal Lake Reservoir is renowned for its ecological significance and is the sole source of drinking water of the third largest
city of Pakistan. However, fish kill in recent years and anthropogenic impacts from human-related activities in its catchment
area have resulted in deterioration of its surface water quality. This study aims to characterize spatial and temporal variations
in surface water quality, identify contaminant sources, and compare their levels with quality guidelines. Surface water samples
were collected from 10 sites and analyzed for 27 physicochemical parameters for a period of 2 years on a seasonal basis. Concentration
of metals in surface water in pre-monsoon were in the order: Fe > Mg > Ca > Mn > Zn > Ni > Cr > Cu > Co > Pb, whereas in post-monsoon,
the order of elemental concentrations was: Ca > Mg > Na > Fe > K > Zn > Cr > Li > Pb > Co > Ni > Cu > Mn > Cd. Metals (Ni,
Fe, Zn, and Ca), pH, electrical conductivity (EC), dissolved oxygen (DO), chemical oxygen demand (COD), and nutrients (PO43−, NO3–N, and SO42−) were measured higher in pre-monsoon, whereas concentration of Cu, Mn, Cr, Co, Pb, Cd, K, Na, Mg, Li, Cl−, and NH4–N were recorded higher in post-monsoon. Results highlighted serious metal pollution of surface water. Mean concentration
of Zn, Cd, Ni, Cu, Fe, Cr, and Pb in both seasons and Mn in post-monsoon were well above the permissible level of surface
water quality criteria. Results stress the dire need to reduce heavy-metal input into the lake basin and suggest that heavy-metal
contamination should be considered as an integral part of future planning and management strategies for restoration of water
quality of the lake reservoir. 相似文献
23.
Muhammad Nadeem Asghar Aneela Anwar Hafiz Muhammad Abdur Rahman Sammia Shahid Iram Nadeem 《毒物与环境化学》2013,95(8-10):659-676
AbstractThe objective of the present study is to synthesize various metal ions mixed TiO2 nanoparticles using a continuous hydrothermal synthesis pilot reactor for dye-sensitized solar cells (DSCs). In the pilot plant, aqueous solutions of the metal salts are mixed with a flow of supercritical water (450?°C and 24.1?MPa) in a confined jet mixer for continuous synthesis of metal ions-mixed nano-titania. Characterization of the particles was made using Brunauer–Emmett–Teller technique for specific surface area, powder X-ray diffraction analysis and transmission electron microscopy for identification and crystallite size, X-ray photoelectron spectroscopy for surface analysis and infrared spectroscopy for distinct group identification. Following the already existing procedures and using the titanates synthesized, dye-sensitized cells of 1?cm2 area were assembled and their photovoltaic parameters were evaluated under standard test conditions. The power conversion efficiencies (η %) for 40?mol % Zn2+, 5?mol % Zr4+ and 10?mol % Zn4+ titania were obtained to be 4.8, 4.95 and 4.9, respectively. The promising efficiency results from a greener and large-scale production of nano-titania is a step forward towards commercializing DSC technology. 相似文献
24.
Severity of zinc and iron malnutrition linked to low intake through a staple crop: a case study in east-central Pakistan 总被引:1,自引:0,他引:1
Ishfaq Muhammad Wakeel Abdul Shahzad Muhammad Nadeem Kiran Aysha Li Xuexian 《Environmental geochemistry and health》2021,43(10):4219-4233
Environmental Geochemistry and Health - Micronutrients deficiency in soil–plant and human is well-addressed; however, little is known about their spatial distribution, magnitude of deficiency... 相似文献
25.
26.
Saeed R Sattar A Iqbal Z Imran M Nadeem R 《Environmental monitoring and assessment》2012,184(4):1909-1919
Environmental impact assessment (EIA) is a policy tool used for evaluating a project proposal from physical and socioeconomic
environmental perspectives. Its aim is to reduce the impact of development on environment, hence, ensuring environmental sustainability.
It is mandatory to submit an Environmental Impact Statement before starting a mega project as required by Environmental Protection
Act of 1997 and Environmental Policy of Pakistan. Public consultation plays a key role in an EIA system, identifying the likely
aspects and impacts of a development activity. This aspect has been ignored in effective enactment of environmental legislation
in Pakistan. Sufficient legislative instruments are there to support EIA system in the country but the agencies responsible
for the enforcement of environmental regulations have failed to do so. The current research gives an insight into the actual
status of EIA system in Pakistan along with the feedback of EIA specialists and university teachers of the concerned departments.
A new index has been devised on the basis of questionnaire response to work out the overall performance of EIA system in Pakistan
or any other country. The weaknesses and deficiencies of each EIA stage have been worked out for Pakistan and elaborated with
the help of the controversial Zero point Interchange Project in the capital city of Pakistan. 相似文献
27.
Nadeem Ali Khurram Shahzad Muhammad Imtiaz Rashid Heqing Shen Iqbal Mohammad Ibrahim Ismail Syed Ali Musstjab Akber Shah Eqani 《Environmental science and pollution research international》2017,24(23):18721-18741
This review summarizes the environmental occurrence of new brominated flame retardants (NBFRs) and organophosphate compounds (OPs) in the environment of developing countries since 2000. The ban on the production and use of commercial formulations of polybrominated diphenyl ethers (PBDEs) have paved the way for the high use of NBFRs and OPs in consumer products to fulfill the fire safety regulations. Recent studies have shown that the ever increasing production volumes and extensive use of these chemicals as additive FRs and plasticizers have resulted into their ubiquitous occurrence in all environmental compartments. Although presumed to be safe for use and the environment, recent studies on their occurrence and persistence in the environment have raised questions. Due to the lack of awareness, research interest, and availability of technical facilities, limited scientific data is available on the occurrence of these chemicals in developing countries. In this study, we collected reported data and provide an overview of environmental occurrence of NBFRs and OPs in abiotic and biotic matrices of different developing countries. Finally, research gaps were identified with recommendations for future research work and would be useful towards the environmental management of these toxic chemicals. 相似文献
28.
Nadeem Hashem 《Local Environment》2015,20(3):386-399
Greater Doha is experiencing lack of sufficient urban green spaces (UGS) as a result of rapid urbanisation to cater for the fast population growth in the country. The availability of green spaces and the improvement of the green/built-up area ratio have been recognised by planners as a key factor in improving the life quality of city dwellers. This study aims at addressing the adequacy and spatial distribution of public parks in Greater Doha. The current status of public parks is assessed in relation to the population distribution using GIS and remote sensing techniques. The results show that the majority of administrative zones fell well below the adopted public parks standards. The park provision ratio ranged from 0 and 0.03 through 0.43 and 0.48 to 0.92 and 0.99 hectare (ha) per 1000 population, with an average of 0.37. After quantifying this deficiency in UGS, the study suggest remedy by identifying vacant parcels in each zone to match the adopted standards, taking into consideration their spatial distribution and minimum area criteria. 相似文献
29.
Shahid Muhammad Nadeem Muhammad Bakhat Hafiz Faiq 《Environmental science and pollution research international》2020,27(32):39671-39675
Environmental Science and Pollution Research - 相似文献
30.
Akhtar Mohammad Nadeem Bani-Hani Khaldoon A. Akhtar J. N. Khan Rizwan Ahmad Nejem Jamal K. Zaidi Khansa 《Journal of Material Cycles and Waste Management》2022,24(5):1663-1678
Journal of Material Cycles and Waste Management - The extraction of unsustainable natural resources like sand and topsoil for construction is disturbing ecological balance, affecting local... 相似文献