微分吸附计时电位法测定痛力克

非成瘾性高效镇痛新药痛力克在硫酸底液中产生一灵敏的微分吸附计时电位溶出峰，峰电位在－１．０Ｖ。利用该峰测定痛力克的线性范围为０．０２－２．０ｍｇ／Ｌ，检测限为０．００４ｍｇ／Ｌ。用线性扫描，循环伏安等方法研究了该体系的电化学行为和电极反应机理，认为所研究体系属于有吸附性的不可逆还原过程，电极反应的电子转移数为２，参与电极反应的质子数为２。用该方法测定了片剂中痛力克的含量，结果满意。     

铋B-芦丁体系的微分吸附计时电位法研究

提出一种测定痕量铋的微分吸附计时电位法。利用悬汞电极作工作电极 ,置富集电位于 0 .10V ,在0 .0 15mol/LHAc 0 0 0 5mol/LNaAc 7.5× 10 -7mol/L芦丁的底液中 ,测定铋 的线性范围为 1.0× 10 -10 ～7 5× 10 -8mol/L ,检出限为 5× 10 -11mol/L。探讨了影响方法灵敏度的主要因素 ,研究了电极过程。利用此法测定了中草药样品中的铋含量 ,结果满意。     

铋(Ⅲ)-芦丁体系的微分吸附计时电位法研究

提出一种测定痕量铋的微分吸附计时电位法.利用悬汞电极作工作电极,置富集电位于0.10 V,在0.015 mol/L HAc-0.005 mol/L NaAc-7.5×10-7 mol/L芦丁的底液中,测定铋(Ⅲ)的线性范围为1.0×10-10～7.5×10-8 mol/L,检出限为5×10-11 mol/L.探讨了影响方法灵敏度的主要因素,研究了电极过程.利用此法测定了中草药样品中的铋含量,结果满意.     

微分倒数示波计时电位滴定

倒数示波计时电位滴定~[1]是最近提出的一种电滴定方法,它把(dE/dt)-E曲线上的切口转变为(dE/dt)~(-1)-E曲线上的峰,从而大大抑制了充电电流,提高了滴定分析的灵敏度.本文报道了微分倒数示波计时电位滴定,即对(dE/dt)~(-1)-E曲线进行一次或二次微分处理,利用示波图上去极剂峰的出现与消失指示终点,使滴定终点更易观察.     

3.5次微分循环示波计时电位法测定铋的研究

本文将３。５次微分循环示波计时电位法应用于铋的示波特性的研究和合成样品中微量铋的测定。铋在０．１ｍｏｌ／Ｌ ＮａＯＨ支持电解质中，于示波图阴极支上产生一灵敏切口，灵敏度为２×１０＾－７ｍｏｌ／Ｌ，线性范围为４×１０＾－７－２×１０＾－６ｍｏｌ／Ｌ。     

恒电流吸附计时电位法的研究 Ⅱ.铜、铅的微分吸附计时电位法连测

研究了ＮＨ３／ＮＨ４Ｃｌ底液中，铜、铅与水杨基荧光酮（ＳＡＦ）形成的络合物在悬汞电极上的恒电流吸附计时电位溶出行为。讨论了富集时间，溶液ｐＨ值，溶出恒电流大小及铜、铅浓度比值等对ｄｔ／ｄＥ～Ｅ溶出曲线的影响。并得出了连测铜铅的条件。     

微分吸附计时电位法测定粮食中痕量钼

本文提出一种测定痕量钼的微分吸附计时电位法，利用悬汞电极作为工作电极，在０．１２ｍｏｌ／ＬＨＡｃ－０．０１ｍｏｌ／Ｌ，ＮａＡｃ－３．２×１０＾－６ｍｏｌ／Ｌ茜素红的最佳底液中，测定钼的线性范围为０．４ｎｇ／ｍＬ～７０ｎｇ／ｍＬ，吸附富集３ｍｉｎ检测下限可达０．１ｎｇ／ｍＬ。探讨了影响方法灵敏度的主要因素，初步研究了电极过程，利用该方法直接测定了粮食样品中钼的含量。     

The Simultaneous Determination of Cu Pb Cd and Sb by Derivative Adsorption Chronopotentiometry

The behaviour of the complexes of copper,lead,cadmium and antimony with salicylfluorone(SAF)adsorbed on HMDE has been investigated by derivative chrono potentiometry in NH3/NH4C1.The dependence of the peak height on the dt/dE vs E curve on preconcentration time,the pH of solution and the constant reducing current are discussed.This method achieved the simultaneous determination of copper,lead,cadmium and antimony in human hair.     

The Simultaneous Determination of Cu Ph Cd and Sb by Derivative Adsorption Chronopotentiometry

Anodic stripping voltammetry (ASV) is an effective electroanalytical technique for themeasurement of trace metal ions. But there are serious interferences due to overlappingstripping peaks and forming of intermetallic complex in complicated system. The peak ofcopper (ASV) is close to that of mercury. So the result of determination of copper is notsatisfactory. Adsorption chronopotentiometry was reported by H.Eskilsson et al i. In thismethod, instead of electrolytic accumulation of metal io…     

Determination of Trace Iron in KH2PO4 Crystal by Derivative Adsorption Chronopotentiometry

A sensitive derivative adsorption chronopotentiometric method was developed to determine trace amounts of Fe³⁺. The influence of preconcentration time, pH of solution and constant reducing current of the peak height is discussed. The detection limit and the linear range are 5.0×10^–10 and 2.0×10^–93.0×10^–6molL^–1, respectively. The method was used to determine trace Fe³⁺ in KH₂PO₄ crystals (KDP).     

Steady State Reciprocal Derivative Chronopotentiometry with Programmed Currents at Microelectrodes

Equations corresponding to the application of Reciprocal Derivative Chronopotentiometry with programmed currents to spherical and disk microelectrodes under steady state conditions have been deduced. Traditional stationary dt/dE vs. E curves for a current time function of the form I(t)=I₀t^u, u>0, and the new dI/dE vs. E curves, which do not depend on the particular characteristics of the applied programmed current I(t) are shown for any degree of reversibility of the electrode process. The evolution from transient to steady state for both derivative techniques has been analyzed. Criteria for characterizing reversible and totally irreversible stationary derivative curves, together with easy methods for determining thermodynamic and kinetic parameters of the charge transfer process from the measure of peak parameters are proposed. The validity of the theoretical predictions has been experimentally tested with hexachloroiridate(IV) reversible oxidation and with iron(III) irreversible reduction in aqueous media.     

微分吸附计时电位法测定表面活性剂的临界胶束浓度

1　引　　言临界胶束浓度 (简称ＣＭＣ)是表面活性剂的重要特性参量。测定ＣＭＣ的电化学方法有多种 ,但利用微分吸附计时电位法测定ＣＭＣ尚未见报道。由于该方法以悬汞电极代替表面易污染的固体电极而使重现性良好 ,同时该方法记录的是ｄｔ ｄＥ～Ｅ曲线 ,因此无需除氧 ,从而简化了分析手续 ,提高了分析速度 ,优于伏安法。我们取代表阴离子表面活性剂类的十二烷基磺酸钠 (ＡＳ)进行实验 ,测定结果与业已公认的方法一致。2　实验部分2 1　仪器与试剂　ＭＰ 1型溶出分析仪 (山东电讯七厂 ) ,79 1型伏安分析仪 (济南无线电四厂 ) ,三电极体…     

Application of a Power Time Current to the Study of a Catalytic Mechanism in Chronopotentiometry and Reciprocal Derivative Chronopotentiometry. Advantages of a Cyclic Stationary Response

This paper develops the theory for a pseudo‐first order catalytic mechanism in chronopotentiometry with a power time current, I(t)=I₀t^u (u≥?1/2), applied to a spherical electrode of any size, and the advantages of the use of small electrodes and ultramicroelectrodes are discussed. The advantages of using a cyclic power time current to reach a stationary response suitable for characterizing a catalytic mechanism easily and accurately are reported. The reciprocal derivative (dt/dE?E) curves, which present peaks quantitatively related to the kinetic parameters of the chemical reaction, have been obtained from the potential‐time responses. The influence of the homogeneous kinetic, the electrode radius and the power of time current in the achievement of a stationary response is analyzed. Methods for determining thermodynamic and kinetic parameters of the chemical reaction are proposed.     

希夫碱类药物中间体的二次微分示波计时电位法测定

建立了应用微机化的二次微分交流示波计时电位法直接测定希夫碱类药物中间体含量的方法。二次微分示波曲线上Ｎ－（２－苯并噻唑）－２－羟基苯甲亚胺、Ｎ－（２－苯并噻唑）－２－羟基－４－溴苯甲亚胺、Ｎ－（２－苯并噻唑）－２－羟基－４－氯苯甲亚胺３种希夫碱峰高与其浓度分别在２７．２～１３６ｒｍｏｌ／Ｌ、４７．０～１１３ｕｍｏｌ／Ｌ和１８．０～１１４ｕｍｏｌ／Ｌ范围内呈线性,相对标准偏差不大于６．０％（n＝３）