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101.
In this study, 79 bulk precipitation samples were collected at two sampling sites near Büyükçekmece Lake, one of the important drinking water sources of Istanbul, for the period of October 2001 to July 2002. The study comprised the determination of trace and toxic metals concentrations in rain water. The concentrations of the metals in this study were found to be higher than those reported by other researchers around the world. The solubility of toxic metals was found in the order of Cd > Cu > V > Zn > Ni > Pb > Cr. Solubility of metals under acidic conditions (pH < 5.5) was approximately five times higher than those under neutral conditions with Cd as the most soluble metal (50% soluble). Statistical evaluations including seasonal variations, crustal enrichment factors, and correlation matrix were discussed to identify the possible sources of these pollutants. The study revealed that anthropogenic elements were highly enriched especially for Cd > Cu > Pb which were found to be highly enriched. Significant portion of Cu and Pb could be increased by the effect of local sources like cement industry in the area; however, the rest of the investigated trace metals could be brought to the sampling site by long-range transport to the Büyükçekmece Lake watershed area. 相似文献
102.
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
103.
Almutairi Mubarak Harb Kamal Marey Omar Almutairi Khalid 《Environmental science and pollution research international》2022,29(59):88587-88605
Environmental Science and Pollution Research - Currently, Saudi Arabia has very limited renewable energy generation capacity, as most of the country’s electricity sector is dependent on cheap... 相似文献
104.
Hernández-Padilla Eyden S. Zárate-Guzmán Ana I. González-Ortega Omar Padilla-Ortega Erika Gómez-Durán Azael Delgado-Sánchez Pablo Aguilar-Aguilar Angélica Cortés Farid B. Ocampo-Pérez Raúl 《Environmental science and pollution research international》2022,29(18):26297-26311
Environmental Science and Pollution Research - In this work, the potential of activated carbon to remove caffeic and chlorogenic acids in aqueous solution was investigated. The study focused on... 相似文献
105.
Omar Farah Nadi Loo Yu Xiang Lee Yei Lie Dzulkornain Chairil Anuar Mohammed P. Mohd Afandi Samsu Azhari Baharuddin 《环境科学学报(英文版)》2015
Co-composting of poultry manure and rubber wood sawdust was performed with the ratio of 2:1 (V/V) for a period of 60 days. An investigation was carried out to study the extracellular enzymatic activities and structural degradation utilizing Fourier transform infrared spectroscopy (FT-IR), thermogravimetry and differential thermal analysis (TG/DTA) and scanning electron microscopy (SEM). The microbial succession was also determined by using denaturing gel gradient electrophoresis (DGGE). The compost was able to reach its highest temperature of 71 ℃ at day 3 and stabilized between 30 and 40 ℃ for 8 weeks. CMCase, FPase and β-glucosidase acted synergistically in order to degrade the cellulosic substrate. The xylanase activities increased gradually during the composting and reached the peak value of 11.637 U/g on day 35, followed by a sharp decline. Both LiP and MnP activities reached their peak values on day 35 with 0.431 and 0.132 U/g respectively. The FT-IR spectra revealed an increase in aromaticity and a decrease in aliphatic compounds such as carbohydrates as decomposition proceeded. TGA/DTG data exhibited significant changes in weight loss in compost samples, indicating degradation of organic matter. SEM micrographs showed higher amounts of parenchyma exposed on the surface of rubber wood sawdust at day 60, showing significant degradation. DGGE and 16S rDNA analyses showed that Burkholderia sp., Pandoraea sp., and Pseudomonas sp. were present throughout the composting process. Ornithinibacillus sp. and Castellaniella ginsengisoli were only found in the initial stage of the composting, while different strains of Burkholderia sp. also occurred in the later stage of composting. 相似文献
106.
Ahmed El-Sayed Omar 《Environment international》1983,9(1):51-54
The mutagenicity of sodium nitrite, potassium chromate, O-tolidine, and smoke condensate from tobacco was shown on Salmonella typhimurium TA 1535. Sodium nitrite was definitely mutagenic on TA 1535 without S-9 mix. Potassium chromate without S-9 mix was also mutagenic on TA 1535. However, addition of S-9 mix resulted in a complete loss of potassium chromate mutagenicity. O-tolidine with and without S-9 mix elicited a very weak and variable mutagenic effect for strain TA 1535. Smoke condensate from pipe tobacco without S-9 mix elicited a weak mutagenic effect, whereas with S-9 mix it showed no mutagenicity on TA 1535. 相似文献
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Many occupations in industry such as metal stamping workers, electronics parts assembly operators, automotive industry welders, and lathe operators require working in a standing posture for a long time. Prolonged standing can contribute to discomfort and muscle fatigue particularly in the back and legs. This study developed the prolonged standing strain index (PSSI) to quantify the risk levels caused by standing jobs, and proposed recommendations to minimize the risk levels. Risk factors associated with standing jobs, such as working posture, muscles activity, standing duration, holding time, whole-body vibration, and indoor air quality, were the basis for developing the PSSI. All risk factors were assigned multipliers, and the PSSI was the product of those multipliers. Recommendations for improvement are based on the PSSI; however, extensive studies are required to validate their effectiveness. multipliers, and the PSSI was the product of those multipliers. Recommendations for improvement are based on the PSSI; however, extensive studies are required to validate their effectiveness. 相似文献