磺胺甲恶唑的二阶导数差示脉冲极谱法测定

建立了磺胺甲恶唑的二阶导数差示脉冲极谱定量分析方法,磺胺甲恶唑在１０％ＨＣｌ－（硼酸－氯化钾缓冲溶液）－水（５：５：９０）的底液中,于－１．４５Ｖ（ｖｓ．Ａｇ／ＡｇＣｌ）处出现一良好的二阶导数差示脉冲极谱峰,磺胺甲恶唑浓度与其峰高在０．０８～０．８０ｍｍｏｌ／Ｌ范围内呈线性关系（ｐ〈０．０１）,检测限为８．６ｎｍｏｌ／Ｌ。本法简便、快速、灵敏、结果准确。     

磺胺二甲嘧啶钠的二阶导数差示脉冲极谱法定量研究

建立了磺酸二甲嘧啶钠的二阶导数差示脉冲极谱定量分析方法,磺胺二甲嘧啶钠在乙醇－（硼酸－氯化钾缓冲液）－水（体积比７０：２：２８）的底液中,于－１．５６０Ｖ（ｖｓ．Ａｇ／ＡｇＣｌ）处出现一良好的二阶导数差示脉冲极谱峰,磺胺二甲嘧啶钠浓度与其峰幅值在０．０６～０．６ｍｍｏｌ．Ｌ＾－１范围内呈非常显著的线性关系（Ｐ〈０．０１）,检出限为９．２ｎｍｏｌ．Ｌ＾－１,已用于注射液中磺酸二甲嘧啶钠的测定。     

二阶导数差示脉冲极谱法用于醋酸氟氢可的松的定量研究

用二阶导数差示脉冲极谱法对醋酸氟氢可的松进行了定量分析。在０．００１ｍｏｌ／Ｌ硫酸＋乙醇＋水（１＋２５＋２４）的底液中，醋酸氟氢可的松于－０．３４０Ｖ（ｖｓＡｇ／ＡｇＣｌ）处出现一良好的二阶导数差示脉冲极谱峰，在５～１４０μｇ／ｍＬ范围内，醋酸氟氢可的松的浓度与其二阶导数差示脉冲极谱峰幅值呈线性关系，检测限为０．４ｎｇ／ｍＬ。本法操作简便、快速、灵敏、结果准确。     

二阶导数差示脉冲极法用于醋酸氟氢可的松的定量研究

用二阶导数差示脉冲极谱法对醛酸氟氢松进行了定量分析。在０．００１ｍｏｌ／Ｌ硫酸＋乙醇＋水（１＋２５＋２４）的底液中，醋酸氟氢可的松于－０．３４０Ｖ处出现一良好的二阶导数差示脉冲极谱，在５－１４０μｇ／ｍＬ范围内，醋酸氟氢可的松的浓度与其二阶导数差示脉冲极谱峰幅值呈线性关系，检测限为０．４ｎｇ／ｍＬ。本法操作简单、快速、灵敏、结果准确。     

一阶导数差示脉冲极谱法用于甲硝唑的定量研究

本实验运用一阶导数差示脉冲极谱法对甲硝唑及其制剂进行了定量研究。在０．００１ｍｏｌ／Ｌ氯化钾－０．００１ｍｏｌ／Ｌ盐酸－水（１＋０．２＋４８）的底液中，甲硝唑于－０．８００Ｖ（ｖｓ Ａｇ／ＡｇＣｌ）处出现一良好的一阶导数差示脉冲极谱峰，在５０～３００μｇ／ｍＬ范围内，药物浓度与其导数峰幅值呈线关系，检测限为８．０×１０＾－８ｍｏｌ／Ｌ。本法操作简便，快速，灵敏，结果准确。     

一阶导数差示脉冲极谱法用于扑热息痛的定量分析

一阶导数差示脉冲极谱法用于扑热息痛及其制剂的定量分析，在乙醇－水－２．０×１０＾－＾３ｍｏｌ／ＬＨ２ＳＯ４（１２．５：１１．５：１）的溶液中，于０．２４Ｖ（ｕｓＡｇ／ＡｇＣｌ）处出现良好的一阶导数差示脉冲极谱峰，在３．３×１０＾－＾４～３．３×１０＾－＾３ｍｏｌ／Ｌ范围内，浓度与其一阶导数差示脉冲极谱峰值呈线性关系，检测限为７．８×１０＾－＾８ｍｏｌ／Ｌ。方法简便，快速，灵敏，结果准确。     

维生素C及其制剂的一阶导数差示脉冲极谱法测定

本文建立了维生素Ｃ及其制剂的一阶导数差示脉冲极谱定量分析方法，在水溶液中，维生素Ｃ于－１．１０Ｖ（ｖｓＡｇ／ＡｇＣｌ）处出现一良好的一阶导数差示脉冲极谱峰，在１～１７５μｇ／ｍＬ范围内，维生素Ｃ浓度与其一阶导数差示脉冲极谱峰幅值呈非常显著的线性关系（Ｐ〈０．０１），方法简便，快速，灵敏，结果准确。     

一阶导数差示脉冲极谱法测定氢氯噻嗪的研究

本研究了一阶导数差示脉冲极谱法用于氢氯噻嗪及其制剂的定量分析。在０．００２ｍｏｌ／Ｌ盐酸－０．００２ｍｏｌ／Ｌ氯化钾底液中，于０．０５０Ｖ（ｖｓ．Ａｇ／ＡｇＣｌ）处出现良好的一阶导数极谱峰，氢氯噻嗪浓度在０～６．０×１０＾－４ｍｏｌ／Ｌ范围内，与峰高呈线性关系，检测限为４．０×１０＾－９ｍｏｌ／Ｌ。方法操作简便、快速、灵敏、结果准确。     

二阶导数差示脉冲极谱法用于咖啡因测定的研究

本文用二阶导数差示脉冲极谱法对咖啡因及其制剂的测定进行了研究。先把咖啡因用０．０１ｍｏｌ／Ｌ／ＮａＯＨ溶解，并加热分解生成咖啡亭，生成物在０．００２ｍｏｌ／ＬＨＣＬ－０．００４ｍｏｌ／ＬＮａＣｌ底液中，于一１．０１０Ｖ（Ａｇ／ＡｇＣｌ）处出现一良好的极谱峰，峰高在０～３．３×１０－３ｍｏｌ／Ｌ范围内与咖啡因的浓度呈线性关系。方法简便、快速、灵敏、结果准确。     

柚皮革甙的电化学研究

用单扫示波极谱法，柚皮甙在０．１ｍｏｌ／ＬＫＨ２ＰＯ４中（ＰＨ＝４．６０）有一灵敏的二阶 导数峰，峰电位为－１．４３Ｃ，峰电流与浓度在０．１－２．８ｍｇ／Ｌ和３．０－４２ｍｇ／Ｌ范围良好线性关系，     

金银花中绿原酸的二阶导数差示脉冲极谱法定量研究

建立了中草药金银花中绿原酸的二阶导娄差示脉冲极谱定量分析方法,绿原酸在0.05mol/L硫酸－3mol/L亚硝酸钾－2.5mol/L乙酸钠－95％乙醇（1：1：1：17）的溶液中,于－0.276V(vs.Ag/AgCl)处出现一良好的二阶导数差示脉冲极谱峰,其峰幅值与绿原酸在0.1-0.6mmol/L范围内呈非常显著的线性关系（P＜0.01）,检出限为8.0nmol/L。本法简便、快速、灵敏,结果准确。     

定量测定秦皮中秦皮甲素的二阶导数示差脉冲极谱法

建立了中草药秦皮中秦皮甲素的二阶导数示差脉冲极谱定量分析方法。秦皮甲素在乙醇－2mol/L氯化锂－水（体积比2：1：5）的底液中,于－1．703V（vs Ag/AgCl)处出现一良好的二阶导数示差脉冲极谱峰,其峰幅值与秦皮甲素在0．2－1．6mmol/L范围内呈非常显著的线性关系（P＜0．01）,检测下限脒50mmol/L。该法简便、快速、灵敏,结果准确。     

丹皮酚在聚苏丹红Ⅲ/GC电极上的电化学行为及测定

应用交流阻抗法和循环伏安法表征聚苏丹红Ⅲ/GC电极,并研究丹皮酚在该聚合物电极上的电化学行为. 实验表明,聚苏丹红Ⅲ/GC电极对丹皮酚具有良好的电催化作用,在3.0*10^-7 ~ 2.2*10^-5 mol·L^-1浓度范围内,其差示脉冲伏安峰电流随浓度变化呈良好的线性关系,检测限为5.0*10^-8 mol·L^-1. 该法可用于实际样品中丹皮酚的测定,结果令人满意.     

多菌灵在玻碳电极上的伏安行为及其应用

应用循环伏安法、微分脉冲伏安法对多菌灵在破碳电极上的电化学行为及其测定进行了研究。在ｐＨ＝９．０的２ｍｏｌ／Ｌ ＮＨ３－ＮＨ４Ｃｌ底液中，对其进行循环伏安扫描，发现于０．６１Ｖ（ｖｓ．Ａｇ／ＡｇＣｌ）产生一灵敏的氧化峰。微分脉冲伏安法殉菌灵的检测限为４×１０＾－８ｍｏｌ／Ｌ。多菌灵的浓度在５．０×１０＾－７￣１．０×１０＾－５ｍｏｌ／Ｌ间与微分脉冲伏安峰电流呈线性关系（ｒ＝０．９９４２）。对于１×     

Determination of the pesticide Chlorpyrifos by cathodic adsorptive stripping voltammetry

The adsorption behavior and differential pulse cathodic adsorptive stripping voltammetry of the pesticide Chlorpyrifos (CP) were investigated at the hanging mercury drop electrode (HMDE). The pesticide was accumulated at the HMDE and a well-defined stripping peak was obtained at –1.2 V vs Ag/AgCl electrode at pH 7.50. A voltammetric procedure was developed for the trace determination of Chlorpyrifos using differential pulse cathodic adsorptive stripping voltammetry (DP-CASV). The optimum working conditions for the determination of the compound were established. The peak current was linear over the concentration range 9.90 × 10^–8– 5.96 × 10^–7 mol/L of Chlorpyrifos. The influence of diverse ions and some other pesticides was investigated. The analysis of Chlorpyrifos in commercial formulations and treated waste water was carried out satisfactorily Received: 10 July 1997 / Revised: 1 April 1998 / Accepted: 6 April 1998     

CdSe/ZnS quantum dots based fluorescence quenching method for determination of paeonol

Aqueous polymethylmethacrylate (PMMA)-capped CdSe/ZnS quantum dots were used as fluorescence probes for paeonol determination. Based on the fluorescence quenching of aqueous CdSe/ZnS quantum dots caused by paeonol, a simple, sensitive and rapid method was developed. Under the optimal conditions, with excitation and emission wavelengths at 350 nm and 620 nm, respectively, the calibration plot of F0-F with concentration of paeonol was linear in the range of 25.04-175.2 mg L(-1) with correlation coefficient of 0.9986. The limit of detection was 0.017 mg L(-1). The concentration of paeonol in paeonol ointment was determined by the proposed method and the result agreed with the claimed value. Furthermore, the possible fluorescence quenching mechanism was discussed.     

Covalent modification of glassy carbon electrode with aspartic acid for simultaneous determination of hydroquinone and catechol

Glassy carbon electrode (GCE) is covalently modified with aspartic acid (Asp). The modified electrode is used for the simultaneous electrochemical determination of hydroquinone (HQ) and catechol (CC) and shows an excellent electrocatalytical effect on the oxidation of HQ and CC by cyclic voltammetry (CV) in 0.1 mol/L acetate buffer solution (pH 4.5). In differential pulse voltammetric (DPV) measurements, the modified electrode could separate the oxidation peak potentials of HQ and CC present in binary mixtures by about 101 mV though the bare electrode gave a single broad response. A successful elimination of the fouling effect by the oxidized product of HQ on the response of CC has been achieved at the modified electrode. The determination limit of HQ in the presence of 0.1 mmol/L CC was 9.0 x 10(-7) mol/L and the determination limit of CC in the presence of 0.1 mmol/L HQ was 5.0 x 10(-7) mol/L. The proposed method has been applied to the simultaneous determination of HQ and CC in a water sample with simplicity and high selectivity.     

阿齐霉素的伏安行为研究

在１．２ｍｏｌ／Ｌ ＮａＯＨ溶液中,阿齐霉素（ａｚｉｔｒｏｍｙｃｉｎ,简称ＡＺＭＣ）有一灵敏的还原伏安峰。当搅拌富集时间为１０s,扫速为５００ｍＶ／ｓ时其吸附伏 安溶出峰电位фp＝－１。３４Ｖ（ｖｓ．Ａｇ／ＡｇＣ１）。用线性扫描,计时库仑法,循环伏安及脉冲极谱等多种手段研究了该体系的伏安行为 和电极反应机理。实验表明该体系属于一有吸附性的不可逆过程,测得电极反应的电子转移数n＝２,体系的an＝１．１４     

Determination of the pesticide Chlorpyrifos by cathodic adsorptive stripping voltammetry

The adsorption behavior and differential pulse cathodic adsorptive stripping voltammetry of the pesticide Chlorpyrifos (CP) were investigated at the hanging mercury drop electrode (HMDE). The pesticide was accumulated at the HMDE and a well-defined stripping peak was obtained at –1.2 V vs Ag/AgCl electrode at pH 7.50. A voltammetric procedure was developed for the trace determination of Chlorpyrifos using differential pulse cathodic adsorptive stripping voltammetry (DP-CASV). The optimum working conditions for the determination of the compound were established. The peak current was linear over the concentration range 9.90 × 10^–8– 5.96 × 10^–7 mol/L of Chlorpyrifos. The influence of diverse ions and some other pesticides was investigated. The analysis of Chlorpyrifos in commercial formulations and treated waste water was carried out satisfactorily