نتایج جستجو برای: ion exchange phase
تعداد نتایج: 955053 فیلتر نتایج به سال:
determination of uranium in natural water and complex solutions using ion exchange chromatography: a combined procedure using ion exchange chromatography and uv-vis spectrophotometry techniques has been developed to measure uranum in natural water and complex solutions. after conditicing , one hundred milli liters of sample solutions have been passed through an ion exchange column,pachked with ...
Introduction: Cyanide, an environmental pollutant which is found in many different industrial effluents, causes water resources pollution being hazardous to human and environment. Cyanide can be removed from aqueous solutions by different methods but most of them are very expensive. In this study, Lewatit FO36 exchange resin was used to remove Cyanide in a batch system. Methods: Removing the...
in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...
سولفات پتاسیم بدلیل اهمیت در صنایع مختلف به روشهای متفاوت (سنتز و جز آن) تولید و به بازار مصرف عرضه می شود. سنتز با روش مانهایم، از مهمترین متدهای تولید این ماده محسوب می شود، با این حال بدلیل هزینه های بالا و آلودگی حرارتی محیط زیست در استفاده از کوره های با دمای زیاد، این روش مشکلات عدیده ای در پی دارد به همین سبب در این پروژه یک روش بر اساس پدیده تعویض یون در تولید این محصول ارائه شده است. ص...
In this study, the blast furnace slag was used as absorbing bed and then, its ionic adsorption was studied. For this reason, various experimental parameters such as pH, contact time and the primary ion concentration were investigated. The remaining concentrations of ions such as; Mn2+ and Fe2+ in water were measured by atomic adsorption spectroscopy. The chemical and p...
in this study, the blast furnace slag was used as absorbing bed and then, its ionic adsorption was studied. for this reason, various experimental parameters such as ph, contact time and the primary ion concentration were investigated. the remaining concentrations of ions such as; mn2+ and fe2+ in water were measured by atomic adsorption spectroscopy. the chemical and phase composition of slag, ...
A blocker of postsynaptic acetylcholine receptors was isolated from venom of the Eastern green mamba Dendroaspis angusticeps, by gel filtration, ion-exchange and reverse phase high performance liquid chromatography. The isolated component blocks neuromuscular transmission and responses to exogenously applied acetylcholine in isolated chick biventer cervices preparations. These results suggest t...
An H/Li exchange model is found to be applicable to describe the diffusion of protons when optical waveguides are formed in LiNbO3 by proton exchange methods where the proton doped crystal structure stays in the pure phase. The H and Li self-diffusion coefficients in the ion exchange model are determined as a function of the proton exchange temperature both for x-cut and z-cut LiNbO3. In this w...
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