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21.
Uzma Maqbool Anwar-Ul-Haq M. Jamil Qureshi 《Journal of environmental science and health. Part. B》2013,48(3):224-230
In-house developed ELISA was standardized to monitor atrazine residues in different environmental samples. The standard curve was linear, indicating an increase in log concentration with decrease in absorbance (%B/B0 = 1.075–0.042 Log C; r = ?0.966). The middle of the test was at 75 ng/L and the lowest detection limit at 4 ng/L. ELISA significantly correlated with the high performance liquid chromatography (HPLC) (r = 0.990). Internal validation showed good accuracy and precision. Maximum atrazine residues were present in Jehlum River water/sediments and maize/sugarcane plant roots. Most of the food samples were found to be contaminated. ELISA required less clean-up steps than HPLC, but showed matrix effect in soil/colored extracts. 相似文献
22.
Ashraf Sohaib Ashraf Shoaib Ashraf Moneeb Imran Muhammad Ahmad Choudhary Zawar Ahmad Hafsa Hadiqa Tul Awais Abeer Bin Kalsoom Larab Farooq Iqra Habib Zaighum Ashraf Sidra Iqbal Qurrat Ul Ain Ghufran Muhammad Sherazi Syed Sami Hussain Akram Muhammad Kiwan Akmal Rutaba Rafique Sundas Nawaz Khawar Safdar Zartasha Siddique Uzma Nasim Hassan Muhammad Arshad Shahroze Virk Abdul Rehman Ashraf Muhammad Saboor Qazi Abdul Humayun Ayesha Izhar Mateen 《Environmental science and pollution research international》2022,29(6):8382-8392
23.
Ara Talat Nisa Waqar-Un Aziz Rukhsanda Rafiq Muhammad Tariq Gill Rafaqat Ali Hayat Malik Tahir Afridi Uzma 《Environmental geochemistry and health》2021,43(10):4345-4345
Environmental Geochemistry and Health - A correction to this paper has been published: https://doi.org/10.1007/s10653-021-00910-5 相似文献
24.
In conjunction with a nationwide motorcycle safety program, the provision of exclusive motorcycle lanes has been implemented to overcome link-motorcycle accidents along trunk roads in Malaysia. However, not much work has been done to address accidents at junctions involving motorcycles. This article presents the development of predictive model for motorcycle accidents at three-legged major-minor priority junctions of urban roads in Malaysia. The generalized linear modeling technique was used to develop the model. The final model reveals that motorcycle accidents are proportional to the power of traffic flow. An increase in nonmotorcycle and motorcycle flows entering the junctions is associated with an increase in motorcycle accidents. Nonmotorcycle flow on major roads had the highest effect on the probability of motorcycle accidents. Approach speed, lane width, number of lanes, shoulder width, and land use were found to be significant in explaining motorcycle accidents at the three-legged major-minor priority junctions. These findings should enable traffic engineers to specifically design appropriate junction treatment criteria for nonexclusive motorcycle lane facilities. 相似文献
25.
Gauba N Mahmooduzzafar Siddiqi TO Umar S Iqbal M 《Journal of environmental biology / Academy of Environmental Biology, India》2007,28(2):303-306
The effect of mercury (Hg) on the biochemical parameters of Lycopersicon esculentum Mill leaf was studied. Application of mercuric chloride in varying concentrations (0.5, 1.0, 1.5 and 2.0 mM HgCl2 kg(-1) sand) caused significant reduction that went up to 89% and 72% chlorophyll a and chlorophyll b contents respectively (at flowering stage), 69% in carotenoid content, 64% in total soluble protein content and 91% in nitrate reductase activity (all at post-flowering stage). The amounts of nitrate and proline increased maximally (151% and 143% respectively) at the flowering stage, whereas total soluble sugar enhanced by 57% at the post-flowering stage. Changes observed in most of the parameters, were concentration dependent. Such studies seem to be able to discover suitable bioindicators of heavy metal pollution. 相似文献
26.
Muhammad I. Chughtai Uzma Maqbool Mazhar Iqbal Muhammad S. Shah Terence Fodey 《Journal of environmental science and health. Part. B》2017,52(12):871-879
This study was undertaken to develop and validate direct competitive ELISA for the determination of chloramphenicol residues in bovine milk. Antisera and an enzyme-tracer for chloramphenicol were prepared and used to develop an ELISA with inhibition concentrations, IC20 and IC50, of 0.09 and 0.44 ng mL?1, respectively. Milk samples were spiked with standards equivalent to 0, 0.2, 0.3, 0.5, 1.0 &; 1.5 ng mL?1 and extracted in methanol. The mean recoveries were found to be 73–100% with coefficient of variance 7–11%. The decision limit (CCα) and detection capability (CCβ) were calculated as 0.10 and 0.12 ng mL?1, respectively. The results were found comparable with the commercial ELISA, having recoveries of 87 to 100%, CCα 0.09 ng mL?1 and CCβ 0.12 ng mL?1. As per Commission Decision 2002/657/EC, in-house ELISA was further validated by using LC-MS/MS. Mass spectral acquisition was done by using electrospray ionization in the negative ion mode applying single reaction monitoring of the diagnostic transition reaction for CAP (m/z 152, 194 and 257). The calibration curve showed good linearity in concentrations from 0.025 to 1.6 ng mL?1 with correction coefficient 0.9902. The mean recoveries were found to be 88 to 100%. The CCα was calculated as 0.057 ng mL?1 and CCβ 0.10 ng mL?1. Since CCα and CCβ are less than half of the MRPL (0.15 ng mL?1), the test was found suitable for screening and quantification of CAP residues in bovine milk samples. Results of surveillance studies indicated that out of 31 analyzed milk samples, 12.9% samples were found with CAP residues but only 3.2% samples were declared positive with maximum concentration 0.31 ng mL?1, slightly above the MRPL. 相似文献
27.
The present study has been carried out to assess groundwater quality in parts of Hindon–Yamuna interfluve region of western
Uttar Pradesh. Fifty-five groundwater samples were collected from hand pumps in post-monsoon 2005 and pre-monsoon 2006 period,
respectively, covering an area of about 1,345 km2. Physical and chemical parameters of groundwater such as electrical conductivity, pH, total dissolved solid, Na, K, Ca, Mg,
HCO3, Cl, and SO4 were determined. Concentration of the chemical constituents in groundwater of the study area varies spatially and temporarily.
Interpretation of analytical data of major ion chemistry helps to identify three chemical types of groundwater i.e. ‘mixed’,
‘mixed bicarbonate’ and ‘alkali bicarbonate’ types. The species likely to occur in groundwater of the study area are Ca-HCO3, Mg-HCO3, Ca-SO4, Na-Cl, Na-SO4, Na-HCO3, K-Cl, and some other possible species of K, depending on its abundance. The groundwater of the study area comes under the
category of moderately hard to very hard, mildly acidic to slightly alkaline in nature. There is anomalously high concentration
of major ions, particularly, Na, K, SO4, and Cl. High SO4 and K values may be related to anthropogenic influences, rather than through some natural process. Sodium along with Cl may
be added to the system through sewage pollution and leachate percolation. 相似文献
28.
An integrated assessment of seawater intrusion in a small tropical island using geophysical,geochemical, and geostatistical techniques 总被引:1,自引:0,他引:1
Nura Umar Kura Mohammad Firuz Ramli Shaharin Ibrahim Wan Nur Azmin Sulaiman Ahmad Zaharin Aris 《Environmental science and pollution research international》2014,21(11):7047-7064
In this study, geophysics, geochemistry, and geostatistical techniques were integrated to assess seawater intrusion in Kapas Island due to its geological complexity and multiple contamination sources. Five resistivity profiles were measured using an electric resistivity technique. The results reveal very low resistivity <1 Ωm, suggesting either marine clay deposit or seawater intrusion or both along the majority of the resistivity images. As a result, geochemistry was further employed to verify the resistivity evidence. The Chadha and Stiff diagrams classify the island groundwater into Ca-HCO3, Ca-Na-HCO3, Na-HCO3, and Na-Cl water types, with Ca-HCO3 as the dominant. The Mg2+/Mg2++Ca2+, HCO3 ?/anion, Cl?/HCO3 ?, Na+/Cl?, and SO4 2?/Cl? ratios show that some sampling sites are affected by seawater intrusion; these sampling sites fall within the same areas that show low-resistivity values. The resulting ratios and resistivity values were then used in the geographical information system (GIS) environment to create the geostatistical map of individual indicators. These maps were then overlaid to create the final map showing seawater-affected areas. The final map successfully delineates the area that is actually undergoing seawater intrusion. The proposed technique is not area specific, and hence, it can work in any place with similar completed characteristics or under the influence of multiple contaminants so as to distinguish the area that is truly affected by any targeted pollutants from the rest. This information would provide managers and policy makers with the knowledge of the current situation and will serve as a guide and standard in water research for sustainable management plan. 相似文献
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Umar Yunusa Al-Batty Sirhan Rahman Habibur Ashwaq Omar Sarief Abdulla Sadique Zakariya Sreekumar P. A. Haque S. K. Manirul 《Journal of Polymers and the Environment》2022,30(4):1244-1263
Journal of Polymers and the Environment - Recently discovered SARS-CoV-2 caused a pandemic that triggered researchers worldwide to focus their research on all aspects of this new peril to humanity.... 相似文献