长链烷基锍脲衍生物用作阴离子选择电极膜载体

合成了一系列长链烷基锍脲类衍生物，用作阴离子选择电极的新型载体，其中以十六烷基丙烯基锍脲苦味酸盐为载体的ＰＶＣ膜电极性能量佳，线性范围为１．０×１０＆－＾２－３．９×１０＾－＾７ｍｏｌ／Ｌ，检测下限为２．７×１０＾－＾７ｍｏｌ／Ｌ苦味酸根离子，测试了电极的选择性，并用十八烷基苯基锍脉苦味酸根电极电位滴定小蘖碱。     

基于硫氮杂冠醚离子载体的高选择性聚合物膜汞离子选择性电极

以硫氮杂冠醚化合物为离子载体,制备了一种高选择性聚合物膜汞离子选择性电极.通过对电极膜的组成及活化条件进行优化,电极在3.0×10-8～1.0×10-4 mol/L的范围内对汞离子呈能斯特响应,响应斜率为31.2 mV/dec,检出限为2.0×10-8 mol/L.该电极对大多数常见的金属离子具有良好的选择性,并可作为指示电极用于电位滴定.     

Organoselenide as a Novel Ionophore for a Silver-Selective Membrane Electrode

Abstract

Three selenium-containing compounds, diphenyl selenide, benzyl phenyl selenide and dibenzyl selenide were used as neutral carriers to make a Ag⁺-selective membrane electrode. All three compounds exhibited higher sensitivity to Ag⁺ than the corresponding sulfides and ethers. The highest sensitivity was obtained by dibenzyl selenide and an electrode constructed using this carrier and bis(l-butylpentyl) adipate as a membrane solvent in a poly(vinyl chloride) membrane matrix exhibited a near-Nernstian response to Ag⁺ in the concentration range from 1 x 10^?5 to 1 x 10^?2 M with a slope of 52 mV per concentration decade. The lower limit of detection was around 1 μM. The ion selectivity of this electrode for Ag⁺ was over 10⁴ times that for other metal cations. Dibenzyl selenide and Ag⁺ interactions were examined by ¹H-NMR spectroscopy.     

9—冠—3衍生物载体锂离子选择性电极

报道了两种９－冠－３衍生物的合成，并以合成的化合物作载体研制了对锂离子响应的ＰＶＣ膜电极。以乙基－９－冠－３为载体的锂离子电极的能斯特响应为１０×１０－１～５２×１０－５ｍｏｌ／Ｌ，斜率为（５７４±０３）ｍＶ／ｐ［Ｌｉ］（２５℃），检测下限为２４×１０－５ｍｏｌ／Ｌ。电极具有良好的稳定性和重现性，用于实际样品测定，结果满意     

Regenerable Bacterial Membrane Electrode for L-Aspartate

Abstract

The use of living bacteria held at the surface of an NH₃ gas sensing membrane electrode permits the construction of a potentiometric sensor for L-aspartate. It is shown that the bacterial electrode, when stored in nutrient media, can have an appreciably longer lifetime than the corresponding electrode based on isolated L-aspartase enzyme. The response range and dynamic properties of the bacterial electrode are comparable to those of the enzyme electrode.     

Binuclear Copper(II) Phthalocyanate as a Ionophore for Membrane Anion-Selective Electrodes

The use of a binuclear metal phthalocyanate as an ionophoric component of PVC membranes of ion-selective electrodes was studied. The proposed electrodes based on planar copper(II) hexa(tert-butyl)biphthalocyanate bound via a benzene ring exhibited satisfactory electrochemical properties in solutions of maleic and terephthalic acids.     

丝氨酸织组膜电极的研究

利用猪肝组织膜配合氨气敏电极,研制了丝氨酸生物催化传感电极。丝氨酸浓度的测定范围为5.1×10~(-5)～3.2×10~(-3)mol/L,检出限为3.1×10~(-5)mol/L。研究和讨论了电极的最佳工作条件,并测定了实验条件下酶催化反应的米氏常数Km。该电极用于合成样品分析,效果满意。     

Microbial Membrane Electrode for Steroid Assay

Abstract

Polyacrylamide - immobilized Nocardia opaca was coupled to a rotating glassy carbon electrode to form a microbial membrane electrode for the estimation of steroid hormones. The principle of assay is baaed on the detection of reduced artificial electron acceptor. The concentration dependence for 3 keto- 4- enesteroids solubilized in methanol was demonstrated.     

A New Type of Precipitating Agent for Copper Membrane Electrode

Abstract

Thiourea as a precipitating agent for copper membrane electrode is proposed. Detailed information is provided concerning the construction of the electrode as well as its application in potentiometric titration and in the direct determination of copper (II) in commercial ethyl alcohol. The theory of the electrode potential is consistent with the Cu(II)/Cu(I) system rather than the Ag (I)/Ag one.     

磺苄青霉素药物电极的研究

报道了一种磺苄青霉素药物电极，以十六烷基三辛基碘化铵为载体，用邻苯二甲酸二壬酯为增塑剂，运用序贯淘汰水平法对膜组成进行了优化；确定了电极最佳膜组成，讨论了一些因素对电极性能的影响。电极响应快速，选择性、稳定性、重现性均较好。电极检测下限可达１．６６×１０＾－６ｍｏｌ／Ｌ，线性范围为６．０３×１０＾－６～１．０×１０＾－１ｍｏｌ／Ｌ，斜率为２８．０ｍＶ／ｐＣ，回收率为９６．１％～１００．４％。可用…     

对季鏻与季鉮离子具有电位响应的二元酸酯PVC膜电极

研究发现二元酸酯PVC膜电极对季鏻和季鉮盐均具有能斯特响应。电极的响应机理是由于季鏻、季鉮阳离子的正电中心与电子云密度较大的酯中苯环产生次级力作用所致。     

秋兰姆衍生物作中性载体的铜离子敏感电极

合成了二硫化二（Ｎ，Ｎ－１，４－亚丁基）秋兰姆，以此为载体，制备了ＰＶＣ膜铜离子敏感电极。结果表明，电极对铜离子具有好的选择性和灵敏度。线性范围为８．０×１０＾－＾７－１．０×１０＾－＾２ｍｏｌ／Ｌ。实验发现有选定的底液条件下此电极对蛋白质蛮具有较好的响应，线性范围为１２．５－２００ｍｇ／Ｌ。讨论了电极有关性能。     

Ketoconazol‐Triiodide Ion Pair Complex as a Suitable Carrier in an Iodide Selective Membrane Electrode

A novel membrane sensor for selective monitoring of iodide, consisting of a triiodide‐ketoconazole ion pair complex dispersed in a PVC matrix, plasticized with a mixture of 2‐nitrophenyl octyl ether and dioctylphtalate with unique selectivity toward iodide ions, is described. The influence of membrane composition, pH of test solution and foreign ions on the electrode performance were investigated. The optimized membrane demonstrates a near‐Nernstian response for iodide ions over a wide linear range from 1.0 × 10^?2 to 1.0 × 10^?5 M, at 25 ± 1 °C. The electrode could be used over a wide pH range 3–10 and has the advantages of high selectivity, fast response time and good lifetime (over 4 months). It was successfully used as indicator electrode in potentiometric titrations and direct potentiometric assay of iodide ions.     

Construction and Application of a PVC Membrane Enoxacin Ion－selective Electrode Based on a Needle－shaped Inner Reference Electrode

IntroductionPVC membrane- coated- wire electrodes areused in the analytical field widely. They are pre-pared usually with platinum wire,silver wire orgraphite rod coated with a PVC thin membranecontaining various active components and plasticiz-ers[1— 3 ] .The electrodes have no inner KCl solutionand they are notinfluenced by the sample pressure.Furthermore,they are free from directional selec-tivity when they are installed,and they can be mi-crominiaturized easily. The shortcomings of th…     

Electroanalytical Studies on Cobalt(II) Ion‐Selective Sensor of Polymeric Membrane Electrode and Coated Graphite Electrode Based on N2O2 Salen Ligands

Poly(vinyl chloride)‐based membranes of salen ligands, 2‐((E)‐((1R,2S)‐2‐((E)‐5‐tert‐butyl‐2‐hydroxybenzylideneamino)cyclohexylimino)methyl)‐4‐tert‐butyl phenol (S₁) and 2‐((E)‐((1R,2S)‐2‐((E)‐3,5‐di‐tert‐butyl‐2‐hydroxybenzylideneamino)cyclohexylimino)methyl)‐4,6‐di‐tert‐butylphenol (S₂) were fabricated and explored as cobalt(II) selective electrodes. The performance of the polymeric membrane electrode (PME) and coated graphite electrode (CGE) were compared and it was observed that CGE showed a wide working concentration range of 1.1×10^?8 to 1.0×10^?1 mol L^?1 with a limit of detection of 7.0×10^?9 mol L^?1 exhibiting the Nernstian slope 29.6 mV/decade of activity in the pH range 3.0–9.0. It was used for the determination of cobalt(II) ions in water, soil, beer, pharmaceutical samples and medicinal plants and would be used as an indicator electrode in potentiometric titration with EDTA.     

Microbial Membrane Electrode for the Determination of Cholesterol

Abstract

A microbial electrode has been developed that uses im -mobilized Nocardia erythropolis for the determination of cholesterol. The relationship between the measuring signal and the cholesterol concentration was linear up from T5-130 um, with a reproducibility of 2 – 7 %. To shorten the measuring time the derivative of the current – time curve was monitored. The resulting response time was 35 – 70 sec. The sensor was usuable for more than 4 weeks.     

Semifluorinated Polymers as Ion‐selective Electrode Membrane Matrixes

Most commercially available fluorous polymers are ill suited for the fabrication of ion‐selective electrode (ISE) membranes. Therefore, we synthesized semifluorinated polymers for this purpose. Ionophore‐free ion‐exchanger electrodes made with these polymers show a selectivity range (≈14 orders of magnitude) that is nearly as wide as found previously for liquid fluorous ion‐exchanger electrodes. These polymers were also used to construct ISE membranes doped with fluorophilic silver ionophores. While the resulting ISEs were somewhat less selective than their fluorous counterparts, the semifluorinated polymers offer the advantage that they can be doped both with fluorophilic ionophores and traditional lipophilic ionophores, such as the silver ionophore Cu(II)‐I (o ‐xylylenebis[N,N ‐diisobutyldithiocarbamate]). We also cross‐linked these polymers, producing very durable membranes that retained broad selectivity ranges. K⁺ ISEs made with the cross‐linked semifluorinated polymer and the ionophore valinomycin showed selectivities similar to those of PVC membrane ISEs but with a superior thermal stability, the majority of the electrodes still giving a theoretical (Nernstian) response after exposure to a boiling aqueous solution for 10 h.     

Flow-Through Sandwich PVC Matrix Membrane Electrode for Flow Injection Analysis

Abstract

A flow-through sandwich potentiometric detector for FIA in which a PVC membrane sensor is applied on a conductive epoxy support is described. It allows simple replacement of the membrane when exhausted or substituition of the sensor system and shows good mechanical and electric stability. The device can be easily included in a block with a location for the reference electrode. The detector was activated with a commercial sensor selective to nitrate and its behaviour in FIA was studied. A comparison of its perfomance with that of a nitrate selective electrode of classic shape constructed by the same technique is presented.