用labview方法分析氧化还原过程的伏安图

V. Mospan, A. Yurko, D. Kukharenko, V. Gladkyi, S. Sankov
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Since the point of the half-wave E1/2 is the point of bending curve, then on the derivative plot, the potential of the half-wave will correspond to the maximum function. Thus, this feature can be proposed to find the value of E1/2 with voltammetograms. From the proposed algorithm has developed a virtual device based on smoothing and differentiation of data. As a result, the potentials of the half-wave were determined. For the obtained potential value, the corresponding diffusion currents I1/2 were determined. The obtained values of diffusion current depending on the concentration are approximated by an exponential equation in which it is necessary to determine the unknown coefficients: constant multiplier and power factor. By logarithmizing the data, the dependency gets a linear look, which allows you to perform a linear approximation of the data set using the built-in virtual device Linear Fit. As a result, a curve for calibration was plotted according to the approximation equation. 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引用次数: 0

摘要

目的。在用电极分析细胞氧化还原过程的伏安图时,需要确定半波E1/2的电位。半波电位的确定是极谱分析和伏安分析定性分析的基础。在两个线性增加的饱和区域之间的电流突变区域的中间,是伏安法上的半波点。有时不可能达到扩散电流Id的可能值,然后确定波高,因为从突变截面的弯曲开始到特征的最后(最大值)点的间隔可能会产生误差。方法。由于半波E1/2的点是弯曲曲线的点,那么在导数图上,半波的势对应于最大值函数。因此,可以提出这个特征,用伏安图来求E1/2的值。在此基础上,提出了一种基于数据平滑和微分的虚拟装置。结果,确定了半波的电位。根据得到的电势值,确定相应的扩散电流I1/2。得到的随浓度变化的扩散电流值近似为指数方程,其中需要确定未知系数:常数乘法器和功率因数。通过对数据进行对数运算,依赖性得到线性外观,这允许您使用内置虚拟设备linear Fit对数据集执行线性近似。结果,根据近似方程绘制了校准曲线。数据线性化、线性逼近、方程系数的校准计算和图形构造的动作序列以虚拟设备的形式实现。发现。本文对分析伏安图的算法进行了改进,提出通过对伏安图对应的截面进行图形微分,从图的最大值中求出半波电位E1/2的值。在伏安图上没有扩散电流Id的最大值时,这样可以避免在确定E1/2时出现错误。创意。建议在伏安图的图形化分化之前进行初步的数据平滑处理。这使得在确定特性的拐点时可以避免歧义,因为实验伏安图的不规则性将被视为函数的极值。在这种情况下,通过使用窗宽为三个元素的低通窗口滤波器获得最佳结果。实用价值。在Labview程序中创建了一个虚拟设备,实现了通过对伏安图进行平滑和图形化微分来确定半波E1/2电位的算法。Сonclusions。Labview中的虚拟仪器用于分析不同浓度下获得的伏安数据。数据处理的结果是构造用于校准的曲线。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
ANALYSIS OF VOLTAMPEROGRAMS OF OXIDATION-REDUCTION PROCESSES WITH LABVIEW MEANS
Purpose. In the analysis of voltammetograms of redox processes for cells with electrodes there is a need to determine the potential of the half-wave E1/2. Finding the half-wave potential is the basis of qualitative analysis of polarographic and voltammetric analyzes. The middle of the area of the abrupt change of current between the two linearly increasing areas of saturation and is the point of the half-wave on the voltammetry. Sometimes it is not possible to reach the possible value of the diffusion current Id and then determining the wave height as the interval from the beginning of the bend of the abrupt section to the last (maximum) point of the characteristic can give an error. Methodology. Since the point of the half-wave E1/2 is the point of bending curve, then on the derivative plot, the potential of the half-wave will correspond to the maximum function. Thus, this feature can be proposed to find the value of E1/2 with voltammetograms. From the proposed algorithm has developed a virtual device based on smoothing and differentiation of data. As a result, the potentials of the half-wave were determined. For the obtained potential value, the corresponding diffusion currents I1/2 were determined. The obtained values of diffusion current depending on the concentration are approximated by an exponential equation in which it is necessary to determine the unknown coefficients: constant multiplier and power factor. By logarithmizing the data, the dependency gets a linear look, which allows you to perform a linear approximation of the data set using the built-in virtual device Linear Fit. As a result, a curve for calibration was plotted according to the approximation equation. The sequence of actions for data linearization, linear approximation, calculation of equation coefficients for calibration and graphical constructions is implemented in the form of a virtual device. Findings. In this work, the algorithm for analyzing the voltammogram is improved: it is proposed to find the value of the half-wave potential E1/2 from the maximum of the graph obtained by graphically differentiating the section of the voltammogram corresponding to the wave. This will allow avoiding errors in determining E1/2 in the absence of the maximum value of the diffusion current Id on the voltammogram. Originality. It is proposed to carry out preliminary data smoothing before graphical differentiation of voltammograms. This makes it possible to avoid ambiguity in determining the inflection point of the characteristic, since the irregularities of the experimental voltammogram will be perceived as the extrema of the function. The best result in this case is obtained by using a low-pass window filter with a window width of three elements. Practical value. A virtual device has been created in the Labview program, which implements the proposed algorithm for determining the potential of the half-wave E1/2 by smoothing and graphical differentiation of the voltammogram. Сonclusions. The virtual instrument in Labview is designed to analyze voltammogram data obtained at various concentrations. The result of data processing is the construction of a curve for calibration.
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