Fish oil is one of the best sources of fatty acids dietary supply. Recently, use of fish oil isenhanced based on its useful effects on human health. Unfortunately, due to industrial pollution,many fish and fish oils have high levels of mercury. Mercury is one of the mos More
Fish oil is one of the best sources of fatty acids dietary supply. Recently, use of fish oil isenhanced based on its useful effects on human health. Unfortunately, due to industrial pollution,many fish and fish oils have high levels of mercury. Mercury is one of the most poisonousmicroelement for the ecosystem. mercury is toxic and can damage the brain and the nervoussystem. The main object of this research was the assessment of Omega-3 fish oil pollution withmercury derived from shark and tuna fish in post-market surveillance in Tehran by cyclicvoltammetry. For this pupose fourteen fish oil brands was collected from market retail andtransferred to the laboratory. In this research, closed vessel microwave extraction and cyclicvoltammetric method was employed. The digestion process was perfomed via four steps in aconstant 50 bar pressure and a gradiant temperature from 145 to 200 ˚C. The mercury content offish oils was in the range of 11.03–107.11 ng/ml. Validation of parameters reveal that theprecision of developed method was 2.3 percent in mean standard deviation. In conclusion, fishsuch as swordfish and shark and tuna fish are also a source of exposure to the heavy metaltoxin, mercury. So the potential toxicity of omega 3 fish oil capsules with mercury must beconsidered and it is necessary to measure the mercury content of these capsules with a simple,precise, accurate and economic method.
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In this paper, graphene oxide (GO) was reduced using inexpensive and environmentally friendly methods on the copper substrate. These methods included constant potential and cyclic voltammetry. In the cyclic voltammetry method, GO was deposited on the copper substrate an More
In this paper, graphene oxide (GO) was reduced using inexpensive and environmentally friendly methods on the copper substrate. These methods included constant potential and cyclic voltammetry. In the cyclic voltammetry method, GO was deposited on the copper substrate and reduced. In the constant potential method, GO was firstly deposited by a drop cast and then reduced by constant potential method. Electrochemically reduced graphene oxide (ERGO) was characterized by using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. In this study, the results showed that the constant potential method was the best method for the electrochemical reducing of GO. In this way, most functional groups had been reduced. In addition, a high density of the defects and wrinkling of the sheets was observed. The Electrochemical impedance spectroscopy (EIS) test also proved that most of the conductivity belonged to the GO reduced by the constant potential method. Consequently, the method can replace chemical methods for the reducing of GO and eliminate the major weakness of chemical methods that use toxic substances.
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In this research work, sodium dodecyl sulfate (SDS( was deposited on the surface of carbon paste electrode by dropping method. Then, the modified carbon paste electrode with SDS containing nickel (Ni/SDS) was prepared by inserting the modified electrode in a solution co More
In this research work, sodium dodecyl sulfate (SDS( was deposited on the surface of carbon paste electrode by dropping method. Then, the modified carbon paste electrode with SDS containing nickel (Ni/SDS) was prepared by inserting the modified electrode in a solution containing nickel nitrate for 5 minutes and sweeping of the consecutive potential in sodium hydroxide solution. Also, considering the importance of using ethylene glycohol as a proposed source instead of hydrogen and because of its slow kinetic on the bare carbon paste electrode, its oxidation investigated on the above modified electrode. The results showed the electrocatalytic oxidation of ethylene glycol on the surface of carbon paste electrode modified with SDS/Ni. The effect of various parameters on the efficiency of modified electrode was investigated and the optimal conditions were determined. Finally, the reaction rate constant between the chemical redox centers at the modified electrode surface and ethylene glycol was calculated. Simplicity, low cost, and high sensitivity are the outstanding features of the electrode.
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Metal corrosion represents a significant cost to the industry. Detection and prevention are possible by use of various methods including electrochemical technics and corrosion inhibitors. In the present study, the performance of two types of inhibitors, 5-bromo-2-(((1-h More
Metal corrosion represents a significant cost to the industry. Detection and prevention are possible by use of various methods including electrochemical technics and corrosion inhibitors. In the present study, the performance of two types of inhibitors, 5-bromo-2-(((1-hydroxybutan-2-yl)imino)methyl)phenol (C11H14BrNO2) and 2-((2-((2-hydroxybenzylidene)amino)ethyl)amino)phenol C15H16N2O2, was investigated in reducing corrosion rate of A106 Gr.b alloy steel used in oil pipelines in corrosive medium of 1M sulfuric acid. The comparison between these two inhibitors and the role of nitrogen in their performance and their life span were investigated by cyclic voltammetric electrochemical technique and fast Fourier transform method for data processing. It was found that the C11H14BrNO2 inhibitor by having a slower kinetics in the decomposition process can stand longer and was more effective than the other corrosion inhibitor. This C11H14BrNO2 inhibitor also has a much better performance in preventing carbon corrosion, despite having a lower nitrogen element in the structure because of its favorable spatial structure and better placement of “N” on the corroded metal surface.
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