The transport of La(III) through a dispersion supported liquid membrane with polyvinylidene fluoride membrane as the liquid membrane support and dispersion solution including HCl solution as the stripping solution and...The transport of La(III) through a dispersion supported liquid membrane with polyvinylidene fluoride membrane as the liquid membrane support and dispersion solution including HCl solution as the stripping solution and 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A) in kerosene as the membrane solution, was studied. As a result, the optimum transport conditions of La(Ⅲ) were obtained as that concentration of HCl solution was 4.0 mol/L, concentration of PC-88A 0.16 mol/L, and volume ratio of membrane to stripping solution 30:30 in the dispersion phase, and pH value 4.0 in the feed phase. Ionic strength had no obvious effect on the transport of La(Ⅲ). Under the optimum conditions, when initial concentration of La(Ⅲ) was 0.8×10-4 mol/L, the transport rate was up to 96.3% during the transport time of 125 min. The kinetic equation was developed based on the law of mass diffusion and theory of interface chemistry. The diffusion coefficient of La(Ⅲ) in the membrane and the thickness of diffusion layer between feed and membrane phases were obtained as 3.20×10-7 m2/s and 3.22×10-5 m, respectively. The calculated results were in good agreement with experimental results.展开更多
An AI^3＋ sensor based on the membrane of acetyl cellulose containing nano γ-Al2O3 crystals was studied. In the buffer solution of 0.5 mol/L CH3COOH-CH3COONa （pH=5.0）, the sensor responds to AI^3＋ in a linear rang...An AI^3＋ sensor based on the membrane of acetyl cellulose containing nano γ-Al2O3 crystals was studied. In the buffer solution of 0.5 mol/L CH3COOH-CH3COONa （pH=5.0）, the sensor responds to AI^3＋ in a linear range from 1.00×10^-5 to 1.00x10-^2 mol/L. A near-Nernstian response was obtained and the regression equation was E （mv） = -161.4-26.54 Ig [AI^3＋] with a detection limit of 7.90x10^-6 mol/L. More than 14 different ions as the considered interferences were tested and the relevant selectivity coefficients were determined using the separate solution method （SSM）. The sensor possesses many advantages including short conditioning time, fast response, and, especially, very good selectivity over a wide variety of other co-existing ions. The sample analysis on the aluminium migration amount from aluminium utensils to the solution was determined by this sensor. The analytical results were agreed with that of inductively coupled plasma-atomic emission spectroscopy（ICP-RES）.展开更多
血小板在动脉粥样硬化、血栓形成以及急性冠脉综合征中起着非常重要的作用。血小板糖蛋白 GP b/ a受体拮抗剂通过与血小板膜上的 GP b/ a受体结合抑制血小板凝集 ,是一种新型高效的血小板抑制剂。目前已广泛地应用于冠心病、不稳定性...血小板在动脉粥样硬化、血栓形成以及急性冠脉综合征中起着非常重要的作用。血小板糖蛋白 GP b/ a受体拮抗剂通过与血小板膜上的 GP b/ a受体结合抑制血小板凝集 ,是一种新型高效的血小板抑制剂。目前已广泛地应用于冠心病、不稳定性心绞痛、急性心肌梗死 (AMI)及冠心病介入治疗后并发症的防治。大系列的临床研究已取得了降低并发症及病死率的显著疗效。展开更多
基金Supported by the National Natural Science Foundation of China (No.90401009)Research Fund for Excellent Doctoral Thesis of Xi'an University of Technology (No.602-210805)
文摘The transport of La(III) through a dispersion supported liquid membrane with polyvinylidene fluoride membrane as the liquid membrane support and dispersion solution including HCl solution as the stripping solution and 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A) in kerosene as the membrane solution, was studied. As a result, the optimum transport conditions of La(Ⅲ) were obtained as that concentration of HCl solution was 4.0 mol/L, concentration of PC-88A 0.16 mol/L, and volume ratio of membrane to stripping solution 30:30 in the dispersion phase, and pH value 4.0 in the feed phase. Ionic strength had no obvious effect on the transport of La(Ⅲ). Under the optimum conditions, when initial concentration of La(Ⅲ) was 0.8×10-4 mol/L, the transport rate was up to 96.3% during the transport time of 125 min. The kinetic equation was developed based on the law of mass diffusion and theory of interface chemistry. The diffusion coefficient of La(Ⅲ) in the membrane and the thickness of diffusion layer between feed and membrane phases were obtained as 3.20×10-7 m2/s and 3.22×10-5 m, respectively. The calculated results were in good agreement with experimental results.
基金This work was supported by the National Natural Science Foundation of China （No. 20577017）.
文摘An AI^3＋ sensor based on the membrane of acetyl cellulose containing nano γ-Al2O3 crystals was studied. In the buffer solution of 0.5 mol/L CH3COOH-CH3COONa （pH=5.0）, the sensor responds to AI^3＋ in a linear range from 1.00×10^-5 to 1.00x10-^2 mol/L. A near-Nernstian response was obtained and the regression equation was E （mv） = -161.4-26.54 Ig [AI^3＋] with a detection limit of 7.90x10^-6 mol/L. More than 14 different ions as the considered interferences were tested and the relevant selectivity coefficients were determined using the separate solution method （SSM）. The sensor possesses many advantages including short conditioning time, fast response, and, especially, very good selectivity over a wide variety of other co-existing ions. The sample analysis on the aluminium migration amount from aluminium utensils to the solution was determined by this sensor. The analytical results were agreed with that of inductively coupled plasma-atomic emission spectroscopy（ICP-RES）.
文摘血小板在动脉粥样硬化、血栓形成以及急性冠脉综合征中起着非常重要的作用。血小板糖蛋白 GP b/ a受体拮抗剂通过与血小板膜上的 GP b/ a受体结合抑制血小板凝集 ,是一种新型高效的血小板抑制剂。目前已广泛地应用于冠心病、不稳定性心绞痛、急性心肌梗死 (AMI)及冠心病介入治疗后并发症的防治。大系列的临床研究已取得了降低并发症及病死率的显著疗效。
