The voltammetic property of amikacin was studied by cyclic voltammetery and differential pulse cathode stripping voltammetry at glassy carbon electrod.In HCl（pH=2） solution,the sensitive reductive peak was obtained ...The voltammetic property of amikacin was studied by cyclic voltammetery and differential pulse cathode stripping voltammetry at glassy carbon electrod.In HCl（pH=2） solution,the sensitive reductive peak was obtained for amikacin at about-0.42V（vs.Ag/AgCl）.There was a good linear relationship between the differential pulse peak current and the concentrate of Amikacin sulfate in the range from 1.25 10-6mol/L to 9.5 10-4 mol/L.The detection limit was 2.75×10-7mol/L.The method was used to determine amikacin in injection samples with satisfactory results.展开更多
利用ab initio HF和密度泛函理论(DFT)B3LYP方法,在6-31G*基组下对1,3-二甲基-5-吡唑-2,4-二氯苯甲酸酯及其同分异构体进行了构型优化和频率分析.在6-31+G**,6-311G*,6-311+G*和6-311+G**不同基组下进行了能量计算,系统分析了前线分子...利用ab initio HF和密度泛函理论(DFT)B3LYP方法,在6-31G*基组下对1,3-二甲基-5-吡唑-2,4-二氯苯甲酸酯及其同分异构体进行了构型优化和频率分析.在6-31+G**,6-311G*,6-311+G*和6-311+G**不同基组下进行了能量计算,系统分析了前线分子轨道特征和能级分布规律.计算结果表明:标题化合物比其同分异构体的能量低、结构稳定.展开更多
Nanometer perovskite-type oxides MgTiO3,CaTiO3,SrTiO3 were prepared using tetrabutyl titanate,alkaline earth metal nitrates as raw materials by sol-gel method.The samples were characterized by thermogravimetry-differe...Nanometer perovskite-type oxides MgTiO3,CaTiO3,SrTiO3 were prepared using tetrabutyl titanate,alkaline earth metal nitrates as raw materials by sol-gel method.The samples were characterized by thermogravimetry-differential thermal(TG-DTA),X-ray diffraction(XRD),UV-Vis spectrophotometer(UV-Vis)and X-ray photoelectron spectroscopy(XPS).Using methylene blue as a degradation target,we studied that calcination temperature had an impact on photocatalytic activity of three different photocatalysts.Through the photocatalytic degradation of methylene blue,photocatalytic activity of the three perovskite-type catalysts was compared.The results showed that different crystal structure resulted in different temperature of optimum activity.The temperature of best photocatalytic activity for MgTiO3 was 700 ℃,CaTiO3 and SrTiO3 were 800 ℃.In the above-mentioned catalyst,CaTiO3 had the highest photocatalytic activity.XPS analysis and catalytic reaction with O2 show that the surface oxygen absorbed capacity is the most important factor which has an influence on photocatalytic activity of three perovskite-type photocatalysts.展开更多
文摘The voltammetic property of amikacin was studied by cyclic voltammetery and differential pulse cathode stripping voltammetry at glassy carbon electrod.In HCl（pH=2） solution,the sensitive reductive peak was obtained for amikacin at about-0.42V（vs.Ag/AgCl）.There was a good linear relationship between the differential pulse peak current and the concentrate of Amikacin sulfate in the range from 1.25 10-6mol/L to 9.5 10-4 mol/L.The detection limit was 2.75×10-7mol/L.The method was used to determine amikacin in injection samples with satisfactory results.
文摘利用ab initio HF和密度泛函理论(DFT)B3LYP方法,在6-31G*基组下对1,3-二甲基-5-吡唑-2,4-二氯苯甲酸酯及其同分异构体进行了构型优化和频率分析.在6-31+G**,6-311G*,6-311+G*和6-311+G**不同基组下进行了能量计算,系统分析了前线分子轨道特征和能级分布规律.计算结果表明:标题化合物比其同分异构体的能量低、结构稳定.
文摘Nanometer perovskite-type oxides MgTiO3,CaTiO3,SrTiO3 were prepared using tetrabutyl titanate,alkaline earth metal nitrates as raw materials by sol-gel method.The samples were characterized by thermogravimetry-differential thermal(TG-DTA),X-ray diffraction(XRD),UV-Vis spectrophotometer(UV-Vis)and X-ray photoelectron spectroscopy(XPS).Using methylene blue as a degradation target,we studied that calcination temperature had an impact on photocatalytic activity of three different photocatalysts.Through the photocatalytic degradation of methylene blue,photocatalytic activity of the three perovskite-type catalysts was compared.The results showed that different crystal structure resulted in different temperature of optimum activity.The temperature of best photocatalytic activity for MgTiO3 was 700 ℃,CaTiO3 and SrTiO3 were 800 ℃.In the above-mentioned catalyst,CaTiO3 had the highest photocatalytic activity.XPS analysis and catalytic reaction with O2 show that the surface oxygen absorbed capacity is the most important factor which has an influence on photocatalytic activity of three perovskite-type photocatalysts.
