靛蓝胭脂红的光谱电化学研究——Ⅱ.靛蓝胭脂红复相电子转移动力学

报道了靛蓝胭脂红在SnO_2透光电极上的复相电子转移动力学参数。由光谱电化学和电化学两种实验方法测定。前一方法为单电位阶跃计时吸收法((SPS/CA)。后一方法为循环伏安法。两种方法的数据处理中均应用了计算机拟合,较之文献中常规的工作曲线法更为简便、正确。两种方法测定的结果十分一致。进一步的研究表明,动力学参数值与靛蓝胭脂红的浓度和溶液pH有关,为靛蓝胭脂红在水溶液中的状态提供了重要信息。     

靛蓝胭脂红的光谱电化学研究 II. 靛蓝胭脂红复相电子转移动力学

报道了靛蓝胭脂红在SnO_2透光电极上的复相电子转移动力学参数。由光谱电化学和电化学两种实验方法测定。前一方法为单电位阶跃计时吸收法((SPS/CA)。后一方法为循环伏安法。两种方法的数据处理中均应用了计算机拟合, 较之文献中常规的工作曲线法更为简便、正确。两种方法测定的结果十分一致。进一步的研究表明, 动力学参数值与靛蓝胭脂红的浓度和溶液pH有关, 为靛蓝胭脂红在水溶液中的状态提供了重要信息。     

靛蓝胭脂红薄层光谱电化学研究(Ⅰ)

采用SnO_2石英玻璃组装的光透薄层电解池,结合紫外可见光谱现场监测技术,研究了靛蓝胭脂红水溶液的电化学还原与氧化过程.测定了不同pH下的式电极电位(E~0)和电子转移数(n).实验结果表明,靛蓝胭脂红在SnO_2电极上的还原为准可逆的两电子转移过程,而它的氧化则为不可逆电极过程.由电解现场检测的光谱,初步探讨了电解还原与氧化的反应机理。     

氧化靛蓝胭脂红褪色光度法测定痕量钛(Ⅳ)

基于稀H2SO4介质中,痕量钛（Ⅳ）对溴酸钾氧化靛蓝胭脂红的褪色反应有明显的催化作用,建立了测定痕量钛的动力学光度分析法.方法检出限为0.31μg/L,线性范围为0～8.0μg/L.本法结合溶剂萃取分离技术,用于人发、茶叶及岩石样品中痕量钛（Ⅳ）的测定,结果满意.     

靛蓝胭脂红共振瑞利散射法测定蛋白质

在pH 2.34的B-R缓冲溶液中,靛蓝胭脂红及蛋白质的共振瑞利散射(RRS)均十分微弱。但两者结合时,形成的复合物能使RRS信号急剧增强,最大散射波长为393 nm。测定人血清白蛋白、牛血清白蛋白、γ-人球蛋白、卵白蛋白的线性范围分别为0.1~3.7、0.08~3.0、0.05~2.0、0.1~2.4 mg/L;相应的检出限分别为24.6、20.7、20.4、25.7μg/L。本法用于人血清、牛奶、豆浆、尿液中总蛋白质的测定,结果与经典的考马斯亮蓝法一致。     

反射薄层光谱电化学方法的应用

用自行设计的反射光谱薄层电解池测定了二茂铁在NaClO_1/CH_3CN中的E~O′和n值、铁氰化钾在KCl底液中和亚甲蓝在KNO_3/DMSO中的扩散系数。对亚甲蓝在二甲亚砜介质中的还原过程进行了研究,证明有一电子还原产物存在。     

掺杂靛红的聚吡咯膜的电色效应

制备了掺杂靛红的聚吡咯（ＰＰｙ）膜修饰电极，这种功能化ＰＰｙ膜电极具有很好的电色效应，其颜色变化明显，响应时间短，稳定性好，是一种新型电色材料。     

Studies on the mechanism of Indigo Carmine removal by solvent sublation

Indigo Carmine (C16H8N2Na2O8S2), an anionic dye, was removed from aqueous solution by solvent sublation of Indigo Carmine-cetyltrimethylammonium bromide (CTAB) complex (sublate) into 2-octanol. A stoichiometric amount of surfactant (surfactant:dye=2:1) was demonstrated to be able to remove over 93% IC from the aqueous solution in 5 min. The apparent activation energy of attachment of the sublate to bubbles was calculated as 1.3 kJ/mol. Parameters were considered. At the same time, on the base of the complete transport mechanism, a mathematical model for the dye-surfactant complexation was obtained. Furthermore, the simulation of the mathematical and experimental data was made with good results.     

Kinetics of oxidation of Indigo Carmine by potassium peroxydisulfate

The reaction is first order in potassium peroxydisulfate and zero order in Indigo Carmine. Hydrogen ions have no effect on the rate in the acidity range of 0.0–0.2 M. Allyl acetate inhibits the reaction. A radical chain mechanism is proposed.

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. 0 0,2 M . . .

     

阳离子艳蓝的薄层光谱电化学研究

用薄层光谱电化学技术研究了阳离子艳蓝的电还原过程。薄层循环伏安图表明阳离子艳蓝有一对接近可逆的氧化还原峰。从光谱发现它有顺反异构体互变现象与变色效应。在氧存在时，循环伏安图和光谱图上均出现新峰，推测阳离艳蓝分子与氧分子能形成电荷转移络合物。测得阳离艳蓝电还原的式电极电势，电子转移数以及扩散系数等参数。并讨论了可能的电极过程。     

Voltammetric Determination of Indigo Carmine and Amaranth on a Silver-Based Mercury Film Electrode

Abstract

The voltammetric behavior of indigo carmine and amaranth on silver-based mercury film electrodes was studied. At pH 4, reduction current peaks were observed at potential ?0.11 V (indigo carmine) and ?0.24 V (amaranth), respectively. The system showed a linear response to both of the food colorants in a concentration range of 0 to 100 ng/ml. Detected at different reduction potentials, indigo carmine and amaranth could be determined separately without interfering with each other. This method demonstrated a better reproducibility and longer life time than the existing techniques.     

Spectroelectrochemical Investigation on Neutral Red

Neutral Red can be used as an indicator, a stain reagent or a mediator compound in the studies of biological redox systems. No reports dealing with the electrode process of Neutral Red, especially, about its kinetics have been published. In this paper we report the determinations of formal reduction potentials, the number of electrons transferred, diffusion coefficient as well as the rate constant of heterogeneous electron transfer     

Gamma-radiation induced decolorization and degradation on aqueous solutions of Indigo Carmine dye

Cesium uptake by natural zeolite clinoptilolite from Bulgaria was studied using batch technique and model solutions. The optimal conditions of interaction were determined. The pseudo-second-order rate model better describes the kinetic data obtained at different concentrations. The intraparticle diffusion and the surface diffusion models were tested to identify the rate-controlling step. The sites in the structure of clinoptilolite that are preferable for exchange were studied by application of Rietveld structural approach and the sequence of site occupation by cesium was followed. The Langmuir isotherm model provides a good fit of the equilibrium experimental data. The thermodynamic parameters for the system were calculated.     

Electrochemical Assessment of Indigo Carmine Dye in Lithium Metal Polymer Technology

Lithium metal batteries are inspiring renewed interest in the battery community because the most advanced designs of Li-ion batteries could be on the verge of reaching their theoretical specific energy density values. Among the investigated alternative technologies for electrochemical storage, the all-solid-state Li battery concept based on the implementation of dry solid polymer electrolytes appears as a mature technology not only to power full electric vehicles but also to provide solutions for stationary storage applications. With an effective marketing started in 2011, BlueSolutions keeps developing further the so-called lithium metal polymer batteries based on this technology. The present study reports the electrochemical performance of such Li metal batteries involving indigo carmine, a cheap and renewable electroactive non-soluble organic salt, at the positive electrode. Our results demonstrate that this active material was able to reversibly insert two Li at an average potential of ≈2.4 V vs. Li⁺/Li with however, a relatively poor stability upon cycling. Post-mortem analyses revealed the poisoning of the Li electrode by Na upon ion exchange reaction between the Na countercations of indigo carmine and the conducting salt. The use of thinner positive electrodes led to much better capacity retention while enabling the identification of two successive one-electron plateaus.     

高温红外光谱电化学薄层池的制作与表征

为了拓宽光谱电化学研究范围,开展高温下电化学反应过程,本文研制了一种高温红外光谱电化学薄层池(HTC)。 研制的HTC清洗方便,操作简单,适用于水体系和有机体系。 该HTC可在室温至373 K(根据溶剂沸点,控温精度为±0.5 K)温度范围内使用,具有良好的电化学性能,红外光谱采集谱图清晰信噪比好。 利用铁氰化钾水溶液和对苯醌离子液体溶液的红外光谱电化学行为对HTC进行了表征,得到较满意的结果。