不可逆电对体系流动注射双安培分析法

流动注射分析具有分析速度快、在线处理能力强、可与多种检测方法联用、精密度高等优点,已经在许多重要领域得到了广泛应用.目前流动注射分析的电化学检测方法主要有电导法、电位法、安培法、库仑法等.     

电化学分析

本文是《分析试验室》定期评述中“电化学分析”第二篇和“离子选择电极”第三篇评述文章,它第一次将上述两课题合并为“电化学分析”课题。它对1987～1990年间(其中离子选择电极为1989～1990年)国内电化学分析的进展作了全面评述。内容包括:基础理论研究、极谱与伏安分析、溶出分析、化学修饰电极、液-液界面电化学、色谱电化学与流动注射分析检测、光谱电化学、离子选择电极、库伦分析及其他分析方法     

第9届流动分析国际会议

19届流动(注射)分析国际会议于2003年2月18日至21日在澳大利亚Geelong市召开,由Deakin大学主办,大会报告共4个。(1)巴西Sa彲Ｐａｕｌｏ大学Ｉ.Gutz,流动分析中的电化学———远远超出检测器的范围之外;(2)联合王国Hull大学G.Green way,芯片上的实验室 收缩型流动分析;(3)美国全球流动注射分析中S.G.Marshall,区带流体学;(4)报告人未详(待考),固相反应器与液相发射器。特邀报告共7个。(1)瑞士Basel大学P.Haus er,流动分析用的电化学传感检测;(2)澳大利亚Melbourne大学S.Kolev,在气相扩散和全蒸发流动注射分析中的金属形态的分离;(…     

气体流动注射分析和连续流动分析系统的研究-二氧化硫气体的电化学测定

本文以电化学气体传感器为检测器,将流动注射技术直接用于二氧化硫气体分析.详细研究了气体流动体系的连接方式、气体流速以及体系中压强的变化对分析信号的影响,得到最佳连接方式,比较了载气流速对气体流动注射分析和连续流动分析的影响.气体流动注射分析法重现性较好,测定2890×10~(-6)mol/mol SO_2的相对标准偏差为0.7%(n=12),测定速度快,可达50样/时.连续流动分析能达到气体传感器的稳态响应信号,灵敏度较高     

乳酸脱氢酶的流动注射分析—电化学检测体系的研究

本文研究了L－乳酸盐＋NADLDH／→/←丙酮酸＋NADH＋H^ 的酶反应动力曲线及NADH的电化学性质与流动伏安检测法，建立了乳酸脱氢酶（LDH）的单泵单液路流动注射分析－电化学检测体系，可测定LDH的活性和浓度。     

流动注射抑制电化学发光法测定维生素C

将在线恒电流电解产生ClO-与Luminol构成了较强的化学发光体系,基于维生素C对该化学发光体系有强抑制作用,结合流动注射技术,建立了测定维生素C的流动注射抑制电化学发光新方法.该方法在维生素C的浓度为2.0×10-10～1.5×10-8 mmol/mL之间分段回归,呈良好的线性,检出限达到5.0×10-11 mmol/mL.     

流动注射电化学发光分析法测定氨苄西林

基于氨苄西林对鲁米诺在铂电极上弱的电氧化发光信号的强增敏作用与流动注射技术的结合,建立了一种测定氨苄西林的电化学发光分析新方法。该法测定氨苄西林的检出限为5.0×10-8g mL,线性范围为8.0×10-8～5.0×10-5g mL,相对标准偏差为2.0%(n=11)。已成功地用于样品中氨苄西林的测定。     

流动注射电化学发光法测定头孢氨苄

根据在强酸性介质中初生态Mn(Ⅲ)直接氧化头孢氨苄产生强化学发光,将在线恒电流电解产生Mn(Ⅲ)与流动注射技术结合,建立了流动注射电化学发光测定头孢氨苄的新方法。在优化的实验条件下,测定头孢氨苄的线性范围为1.0×10-7~6.0×10-5g/mL,检出限为5×10-8g/mL,相对标准偏差为1.8%(c=5.0×10-6g/mL,n=11)。方法简便快速,用于头孢氨苄胶囊中头孢氨苄含量的测定,结果满意。     

流动注射电化学发光分析法测定甲磺酸培氟沙星

甲磺酸培氟沙星为第三代喹诺酮类抗菌药,疗效好,抗菌谱更广,且对青霉素、头孢菌素、氨基苷类耐药菌株均有效,在临床上被广泛使用。本文发现,在Na2CO3-NaHCO3碱性溶液中,1．40V电解电位下,鲁米诺在铂电极上的弱电化学发光信号可以被甲磺酸培氟沙星强烈地增敏,据此建立了甲磺酸培氟沙星的流动注射电化学发光分析方法。     

流动注射电化学发光分析法测定间苯三酚

基于间苯三酚对鲁米诺在铂电极上弱的电氧化发光信号的强增敏作用与流动注射技术的结合 ,建立了一种测定间苯三酚的电化学发光新方法。该法测定间苯三酚的检出限为 1.2× 10 - 4g L ;线性范围为 4 .0× 10 - 4～ 4 .0× 10 - 2 g L ;相对标准偏差为 4 .7%。     

流动注射分析

本文是《分析试验室》定期评述专号中“流动注射分析”课题的第二篇评述文章。它评述了1988年10月至1990年10月流动注射分析在我国的进展及国际上发展的新动向。内容包括:基础研究、实验装置与仪器、分光光度分析、原子光谱、电化学检测和化学发光分析、梯度技术与计算机方法等。     

Electroanalytical flow measurements

A review based on 94 cited original papers describes recent achievements in application of different electrochemical detection in flow analysis, injection techniques of flow analysis, liquid chromatography and capillary electrophoresis.     

电化学免疫分析法研究进展

电化学免疫分析法是将免疫分析与电化学分析技术相结合的一种免疫分析新方法，近十多年来，电化免疫分析的研究有了迅速的发展。本文对电化学的免疫分析法的标记物、免疫方法、电化学检测技术进行了概括总结，并展望了电化学免疫分析的发展前景。     

Micromachined detectors for an enzyme-based FIA

Micromachining techniques were applied to construct biosensor systems. The micromachined biosensors have small size, low production cost, and good reproducibility. We made some detection units for flow injection analysis (FIA). An electrochemical flow cell was fabricated, and both the enzyme immobilized column and electrochemical detector were integrated onto the same chip. A chemiluminescence detector was also fabricated and applied to the determination of glucose and lactic acid contained in human serum and urine.     

Application of a Hexa-Electrode Electrochemical Detector for Flow Injection Analysis

Extending from the development of dual-electrode electrochemical detector, a hexa-electrode electrochemical detector for use with the FIA was proposed. With this hexa-electrode detector, the in-series and in-parallel modes of dual-electrode can be easily performed either individually or simultaneously. Feasibility of the hexa-electrode detector for repetitive analyses which would result in an enhancement of S/N ratio was demonstrated by running the square wave anodic stripping voltammetry (SWASV) analysis of cadmium. From the normalized linear calibration graph and the enhanced sensitivity obtained. applicability of the HED as a versatile electrochemical detector for flow injection analysis was confirmed.     

Electrochemically assisted injection – a new approach for hyphenation of electrochemistry with capillary-based separation systems

A new concept based on the electrochemical conversion of analyte species during the injection into capillary flow systems is presented. This approach is termed electrochemically assisted injection (EAI). In a specially designed injection cell containing the analyte solution a conversion efficiency of about 83% can be achieved. Potassium octacyanotungstate(IV) served as a model compound for the analytical characterisation of EAI applying capillary flow injection analysis with double-pulse amperometric detection. Capillary electrophoresis experiments were performed using EAI to study the electrochemical oxidation of various ferrocene derivatives in acetonitrile solution. The electropherograms recorded with UV detection show separated signals for the ferrocene compounds and their oxidation products. The migration behaviour and the stability of ferrocenium cations and other reaction products were investigated.     

液帘电极的研究与应用

本文设计了一种带有液帘电极的流通电解池,在对其各种电化学性质及特点进行了较为全面地研究之后。又从几个方面探讨了其实际应用包括流动注射分析的可能性。     

Bioelectrochemical studies on catalase modified glassy carbon paste electrodes

The enzyme catalase (EC: 1.11.1.6) has been covalently coupled onto the surface of glassy carbon (GC) powder matrix using a 16 atom spacer arm. The enzyme coupled powder was made into a paste electrode that was used to study the electrochemical properties. Standard electrochemical techniques like cyclic voltammetry, differential pulse voltammetry and flow injection analysis studies were carried out using this paste electrode. The cyclic voltammogram of the modified paste exhibited a clear increase in the reduction peak at −180 mV in the presence of hydrogen peroxide. The potential at which maximum Faradaic activity was observed was determined using differential pulse voltammetry, which showed a clear peak at −100 mV. This potential was used to monitor the response of the electrode to varying substrate concentrations using a home made setup for flow injection analysis. A linear increase in the current values in the range 0.1–1 mM hydrogen peroxide concentration was observed in our system.     

Electroanalysis of tetracycline using nickel-implanted boron-doped diamond thin film electrode applied to flow injection system.

The electrochemical analysis of tetracycline was investigated using nickel-implanted boron-doped diamond thin film electrode by cyclic voltammetry and amperometry with a flow injection system. Cyclic voltammetry was used to study the electrochemical oxidation of tetracycline. Comparison experiments were carried out using as-deposited boron-doped diamond thin film electrode (BDD). Nickel-implanted boron-doped diamond thin film electrode (Ni-DIA) provided well-resolved oxidation irreversible cyclic voltammograms. The current signals were higher than those obtained using the as-deposited BDD electrode. Results using nickel-implanted boron-doped diamond thin film electrode in flow injection system coupled with amperometric detection are presented. The optimum potential for tetracycline was 1.55 V versus Ag/AgCl. The linear range of 1.0 to 100 microM and the detection limit of 10 nM were obtained. In addition, the application for drug formulation was also investigated.     

气体流动注射分析和连续流动分析系统的研究-二氧化硫气体的电化学测定

本文以电化学气体传感器为检测器, 将流动注射技术直接用于二氧化硫气体分析。详细研究了气体流动体系的连接方式、气体流速以及体系中压强的变化对分析信号的影响, 得到最佳连接方式, 比较了载气流速对气体流动注射分析和连续流动分析的影响。气体流动注射分析法重现性较好, 测定2890×10^-^6mol/mol SO2的相对标准偏差为0.7%(n=12), 测定速度快, 可达50样/时。连续流动分析能达到气体传感器的稳态响应信号, 灵敏度较高。