示差脉冲极谱法确定镉(Ⅱ)-甘胺酸体系的配合物稳定常数

在镉离子浓度为5.00×10-5~2.00×10-4mol.L-1、甘氨酸与镉离子浓度比为100~400条件下,应用示差脉冲极谱技术测定不同溶液pH值时镉(Ⅱ)-甘氨酸体系的极谱峰电位和峰电流,依据极谱峰电位随溶液pH和自由金属离子浓度的变化关系曲线,建立合适的金属配合物体系模型。通过求解体系的质量平衡方程及拟合试验配合物形成曲线,用计算机分析程序优化得到MHL、ML、ML2、ML3和ML2(OH)五种金属配合物的稳定常数(lgβ)分别为9.67±0.15,4.35±0.02,7.83±0.03,10.04±0.04和11.48±0.13。     

电流密度对钙磷沉积层组成和结构的影响(英文)

用X射线衍射、激光拉曼光谱以及等离子体原子发射光谱等技术研究了电化学沉积钙磷陶瓷过程中 ,电流密度对电沉积层组成和结构的影响 .实验表明阴极表面得到的沉积物是几种钙磷盐组成的混合物 ,且其成份随电流密度的改变而发生较大的变化 .在电解液温度为 75℃条件下 ,当控制电流密度较低时 ,沉积层主要由CaHPO4· 2H2 O (DCPD)和Ca8H2 (PO4) 6· 5H2 O (OCP)组成 ;随着电流密度的增加 ,阴极表面逐渐生成Ca3 (PO4) 2 ·nH2 O (TCP)和Ca10 (PO4) 6(OH) 2 (HAP) .当电流密度大于 5mA/cm2 时 ,电沉积层的主要成份为羟基磷灰石 (HAP) .     

电解合成Na2FeO4制备K2FeO4

复分解;电解合成Na2FeO4制备K2FeO4     

电极材料的组成设计与电催化性能——介绍一个研究性实验

根据各种金属与氢原子形成M—H键的强度不同，设计并制备不同组成的二元合金电极。重点探讨了电极材料的组成与电催化性能之间的相互关系，可通过调节电极表面吸附氢原子的能力，降低析氢反应的活化能，提高整个过程的反应速度，减小析氢反应的过电位。     

络合物形成曲线用于金属络合物稳定常数的极谱法研究

本文用示差脉冲极谱技术研究Pb(Ⅱ) 络合剂(β N 三丙酸)体系。依据实验得到的极谱峰电位的移动随溶液pH值的变化关系曲线,建立合适的金属络合物体系模型。用计算机分析程序,通过求解体系的质量平衡方程及拟合实验络合物形成曲线,优化得到金属络合物的稳定常数。计算机分析结果表明,在所研究的pH值范围内,溶液中存在四种金属络合物:PbH2L+、PbHL、PbL-、PbL(OH)2-,其稳定常数(logβ)分别为:16.23±0.04、12.42±0.01、4.11±0.05、9.43±0.02。     

高铁酸盐研究进展

综述了近年来国内外关于高铁酸盐研究的最新进展,重点就高铁酸盐的制备、分析、应用等方面进行了概述。参考文献37篇。     

电位法和极谱法联合确定镉-甘胺酸络合物稳定常数

应用离子敏感电极和示差脉冲极谱两种实验技术,对镉-甘胺酸络合物体系进行研究,并通过一种联合的数学处理方法,使两种实验数据可以用来设计金属络合物体系模型及计算络合物的稳定常数.在相同的实验条件下(如总的络合剂浓度和总的金属离子浓度相同),两种实验技术将会得到几乎相同的实验络合物形成曲线和理论络合物形成曲线.将联合的数学处理方法应用于镉-甘胺酸络合物体系,不但验证了文献报道的三种络合物 ML、ML_2和 ML_3的存在,还发现了两种新的络合物 MHL 和 ML_2(OH),并且优化得到了这五种络合物的稳定常数.     

电位法和极谱法联合确定镉-甘胺酸络合物稳定常数

The cadmium(Ⅱ)-glycine system was studied by the two experimental techniques, ion sensitive electrode (ISE) and differential pulse polarography (DPP), and the experimental data obtained were used by a unified mathematical treatment to calculate the complex stability constants. The combination of the two techniques is of many advantages as ISE can be performed at low LT:MT ratios and significantly higher MT, whereas DPP could be used well at large LT:MT ratios and much smaller MT. This makes it possible to study a metal-ligand system in a relatively broader range of experimental conditions that, in turn, provides more information about the metakligand system of interest. Applying the unified mathematical treatment to the cadmium-glycine system, two new complexes MHL and ML2(OH) as well as three complexes ML, ML2 and ML3, reported in literatures, could be modeled and all their stability constants have been refined.     

联合处理电位法和极谱法得到的实验数据确定金属配合物稳定常数(英)

The cadmium(Ⅱ)-glycinamide system was modeled and its stability constants were calculated by a unified mathematical treatment for experimental data obtained from ion selective electrode (ISE) and differential pulse polarography (DPP). It has been shown that very much the same experimental complex formation curve (ECFC) and theoretical complex formation curve (TCFC) could be given from both experimental techniques for the same experimental conditions, such as the same total ligand c(L_T) and metal ion c(M_T) concentrations. The combination of the two techniques is of many advantages as ISE can be performed at low a c(L_T)∶c(M_T) ratio and significantly higher c(M_T), whereas DPP could be used well at larger the c(L_T)∶c(M_T) ratio and very low c(M_T). This makes it possible to study a metal-ligand system in much broader range of experimental conditions that, in turn, provides us more data and information about the metal-ligand system of interest. Application of the unified mathematical treatment to the cadmium-glycinamide system in this paper, three new complexes MHL, ML₃ and ML₃(OH) as well as two complexes ML and ML₂, reported in literatures, could be modeled and all their stability constants have been refined.