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Determination of Copper by Flame Atomic Absorption Spectrometry after Preconcentration with Activated Carbon Impregnated with a New Schiff Base

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Chinese Journal of Chemistry 2005年第10期23卷 1437-1442页

作者： SABER TEHRANI, Mohammad RASTEGAR, Faramarz PARCHEHBAF, ayob REZVANI, Zolfaghar Department of Chemistry Faculty of Science Science and Research Campus lslamic Azad University Tehran Iran Plate-Form Analitique lnorganique Lois Pasteur University Strasburg France Department of Chemistry Faculty of Science Azarbaijan Tarbiat Moallem University Tabriz Iran

A simple and reliable method for the extraction and determination of trace amounts of copper（Ⅱ） ions using activated carbon （AC） impregnated by a new Schiff base 5-[（4-heptyloxyphenyl）azo]-N-（4-propyloxyphenyl）-salicylaldimine （HPPS） and atomic absorption spectrometry is presented. Recovery efficiency and the influence of pH value, volume of sample solution, effect of different eluents, and interfering ions were evaluated. The limit of detection （3σ） was 2.62 ***^-1 and the relative standard deviation （n=10） was 1.5%. Under optimum conditions, the copper ions were concentrated 25 fold using 250 mL of sample solution and 10 mL of eluent. This procedure has been successfully applied to the determination of copper in different water samples.

关键词： preconcentration determination copper flame atomic absorption spectrometry activated carbon

Determination of Pb（Ⅱ） and Cu（Ⅱ） by Electrothermal Atomic Absorption Spectrometry after Preconcentration by a Schiff Base Adsorbed on Surfactant Coated Alumina

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Chinese Journal of Chemistry 2006年第6期24卷 765-769页

作者： SABER TEHRANI, Mohammad RASTEGAR, Faramarz PARCHEHBAF, ayob KHATAMIAN, Masoomeh Department of Chemistry Science and Research Campus Islamic Azad University Tehran Iran Plate-Form Inorganic Analytical Chemistry Louis Pasteur University Strasbourg France Department of Inorganic Chemistry Faculty of Chemistry University of Tabriz Tabriz Iran

1,2-Bis（salicylidenamino）ethane loaded onto sodium dodecyl sulfate-coated alumina was used as a new chelating sorbent for the preconcentration of traces of Pb（Ⅱ） and Cu（Ⅱ） prior to atomic absorption spectrometric determination. The influence of pH, flow rates of sample and eluent solutions, and foreign ions on the recovery of Pb（Ⅱ） and Cu（Ⅱ） by this sorbent has been studied. The retained ions were eluted with 4 mol·L nitric acid and determined by electrothermal atomic absorption spectrometry （ETAAS）. The data of limit of detection （3σ） for Pb（Ⅱ） and Cu（Ⅱ） were found to be 8.57 and 2.69 ng·L^-1 respectively, while the enrichment factor for both ions was 100. The proposed method was successfully applied to determination of lead and copper in different water samples.

关键词： determination of lead and copper preconcentration 1,2-bis(salicylidenamino)ethane ETAAS

Effects of rainfall patterns on runoff and soil erosion in field plots

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International Soil and Water Conservation Research 2015年第4期3卷 273-281页

作者： Mohamad ayob Mohamadi Ataollah Kavian Department of Watershed Management Sari Agricultural Sciences and Natural Resources University(SANRU)SariMazandaranIran

Soil erosion processes during a storm are strongly affected by intra-storm variations in rainfall *** storm patterns,each with a different rainfall intensity variation were *** storm patterns were:(1)increasing rainfall intensity(2)increasing then decreasing intensity(3)decreasing intensity(4)decreasing then increasing *** each erosive rainfall(12 events),Runoff and suspended sediment samples were collected in each plot's tank which is located on hillslopes of the basin of *** storm characteristics and soil losses were plotted and equation of the line of best fit were *** of variance(ANOVA)was used to determine response of runoff and soil erosion to storm *** showed that in lower rainfall intensities a linear function fits the relationship between soil loss and rainfall intensity whereas this function tends to be non-linear at higher *** a strong non-linear relationship was found between different quartiles of storm and soil *** analysis revealed significant differences in total runoff,soil loss and sediment concentration across four storm patterns(P<0.001)but no differences in the runoff *** particular,storms with increasing rainfall intensity yielded highest quantities of eroded sediments,total runoff and highest sediment concentrations followed by increasing then decreasing,decreasing then increasing and decreasing intensity,respectively.

关键词： Storm patterns Soil erosion Rainfall intensity Erosion plot

Sponge-based materials for oil spill cleanups: A review

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Frontiers of Chemical Science and Engineering 2020年第5期14卷 749-762页

作者： Edward Mohamed Hadji Bo Fu ayob Abebe Hafiz Muhammad Bilal Jingtao Wang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China College of chemical engineering Nanjing Forestry UniversityNanjing 210037China

Elimination of leaked oil from aquatic environs has recently gained importance owing to the disasters associated with leakages into marine *** need for an environmentally friendly and viable line of action concerning the environs has brought forward numerous affordable,non-toxic,and decomposable materials;further,diverse biomasses for fabricating nano-to micro-scale materials,membranes,and sponges/aerogels have also been incorporated for the elimination and retrieval of oils from ***,selectivity,sorption capacity,and reusability of these materials after the retrieval of oils are also desired from the viewpoint of *** review encompasses the recent progress in the field of elimination and retrieval of oil spills using various sponge-based materials.

关键词： membranes sponges reusability sorbents selectivity sorption capacity

Dynamic Leveling Control of a Wireless Self-Balancing ROV Using Fuzzy Logic Controller

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Intelligent Control and Automation 2013年第2期4卷 235-243页

作者： Mohammad Afif ayob Dirman Hanafi ayob Johari Department of Communication Engineering Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia Batu Pahat Malaysia Department of Mechatronic and Robotic Engineering Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia Batu Pahat Malaysia

A remotely operated vehicle (ROV) is essentially an underwater mobile robot that is controlled and powered by an operator outside of the robot working environment. Like any other marine vehicle, ROV has to be designed to float in the water where its mass is supported by the buoyancy forces due to the displacement of water by its hull. Vertically positioning a mini ROV in centimeters resolution underwater and maintaining that state requires a distinctive technique partly because of the pressure and buoyance force exerted by the water towards the hull and partly because of the random waves produced by the water itself. That being said, the aim of the project is to design and develop a wireless self-balancing buoyancy system of a mini ROV using fuzzy logic controller. A liquid level sensor has been implemented to provide feedback to the controller. A user-friendly graphical user interface (GUI) has been developed for real-time data monitoring as well as controlling the vertical position of the ROV. At the end of the project, the implemented fuzzy control system shows enhanced and better performance when compared with one without a controller, a proportional-derivative (PD) controller, and a proportional-integral-derivative (PID) controller.

关键词： Fuzzy Logic Controller ROV Underwater Vehicle Wireless

A Study on the Contribution of Vocational Education and Training to the Industrial Development in China

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Journal of Contemporary Educational Research 2024年第3期8卷 221-226页

作者： Xiu Wen Zhang Adenan ayob Faculty of Education and Liberal Studies City University Malaysia46100 Petaling JayaSelangorMalaysia Jining Normal University Inner Mongolia012000China

Vocational education and training are an important part of China’s national education *** two essential characteristics of employment orientation and social service determine that vocational education has a closer connection with social production than other types of *** present,China’s economic development is in a new stage of transformation and *** new normal of the economy will inevitably require a corresponding new normal of vocational education and *** transformation of social needs will eventually lead to changes in the composition of the *** education and training should be aligned with the characteristics of the new normal *** mixed research methods,this study focuses on vocational education and training and explores how it contributes to industrial development in China.

关键词： Vocational education and training Industrial development China