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Hossein Tavallali Gohar Deilamy-Rad Pegah Peykarimah 《Environmental monitoring and assessment》2013,185(9):7723-7738
A novel nanomaterial has been developed for speciation of Cr(III) and Cr(VI) in water and soil samples. In this study, a new type of alumina-coated magnetite nanoparticles (Fe3O4/Al2O3 NPs) modified by the surfactant Triton X-114 has been successfully synthesized and used in magnetic mixed hemimicelles solid-phase extraction procedure. The procedure was based on the reaction of chromium(III) with 1-(2-pyridilazo)-2-naphtol as a ligand, yielding a complex, which was entrapped “in situ” in the surfactant hemimicelles. The concentration of chromium(III) was determined using flame atomic absorption spectrometry. After reduction of Cr(VI) to Cr(III) by ascorbic acid, the system was applied to the total chromium. Cr(VI) was then calculated as the difference between the total Cr and the Cr(III) content. This method can also be used for complicated matrices such as soil samples without any special pretreatment. Under the optimum conditions of parameters, the recoveries of Cr(III) by analyzing the spiked water and soil samples were between 98.6 and 100.8 % and between 96.5 and 100.7 %, respectively. Detection limits of Cr(III) were between 1.4 and 3.6 ng?mL?1 for water samples and 5.6 ng?mg?1 for soil samples. 相似文献
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Behdin Nowrouzi Basem Gohar Behnam Nowrouzi-Kia Martyna Garbaczewska Olena Chapovalov Étienne Myette-Côté 《International journal of occupational safety and ergonomics》2016,22(3):360-366
Purpose. The purpose of this particular study was to test a newly created instrument in describing the facilitators and barriers to occupational health and safety in small and medium-sized enterprises (SMEs) in Ontario, Canada. Methods. A cross-sectional design was used to identify the occupational health and safety culture of SMEs in public and private sectors in Ontario. Results. A total of 153 questionnaires were completed. The majority of respondents were female (84%) with a mean age of 49.8 years (SD 10.6). Seventy-four percent were supervisors. Seventy percent of respondents were from the private sector while 30% derived from the public sector including healthcare, community services, and non-profit organizations. Further, conducting regular external safety inspections of the workplace was found to be statistically associated with a safe work environment 2.88 95% CI [1.57, 5.27]. Conclusions. Strategies and training opportunities that focus on how to adapt occupational health and safety legislation to the nature and diversity of SMEs are recommended. Furthermore, employers may use such information to improve safety in their SMEs, while researchers can hopefully use such evidence to develop interventions that are applicable to meeting the occupational health and safety needs of SMEs. 相似文献
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Azam Muhammad Gohar Ali Bekun Festus Victor 《Environmental science and pollution research international》2022,29(39):59060-59075
Environmental Science and Pollution Research - The motivation for the current study stem from the United Nations Sustainable Development Goals (UN-SDGs) such as access to clean (SDG-7) and... 相似文献
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Gohar Atia Shakeel Muhammad 《Environmental science and pollution research international》2021,28(13):15794-15805
Environmental Science and Pollution Research - The quality of natural honey depends upon many factors with significant contribution of environmental factors. In this study, environmental impact on... 相似文献
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Ghonam Hasnaa E-B. Abu Yousef Morsy A. Gohar Yousry M. Almeer Rafa Barakat Khouloud M. 《Environmental science and pollution research international》2021,28(43):60833-60841
Environmental Science and Pollution Research - In more than two-thirds of the diabetic foot ulcer (DFUs) cases, lower limb amputation of foot ulceration is caused by the infection. The role of... 相似文献
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