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长链烷基锍脲衍生物用作阴离子选择电极膜载体 总被引:1,自引:0,他引:1
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。 相似文献
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《Analytical letters》2012,45(12):1979-1989
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. 相似文献
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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10×10-1~52×10-5mol/L,斜率为(574±03)mV/p[Li](25℃),检测下限为24×10-5mol/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 相似文献
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《Analytical letters》2012,45(10):751-758
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. 相似文献
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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. 相似文献
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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。 相似文献
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《Analytical letters》2012,45(13):1201-1210
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. 相似文献
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《Analytical letters》2012,45(9):1363-1377
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. 相似文献
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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… 相似文献
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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。 相似文献
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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。 相似文献
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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. 相似文献
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HUANG Chao-lun * LI Rui-fen XIU Rong School of Pharmaceutical Sciences Hebei Medical University Shijiazhuang P. R. China 《高等学校化学研究》2003,19(4):409-412
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… 相似文献
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Koteswara Rao Bandi Ashok Kumar Singh Kamaluddin A. K. Jain V. K. Gupta 《Electroanalysis》2011,23(12):2839-2850
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. 相似文献
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《Analytical letters》2012,45(10):825-836
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. 相似文献
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《Electroanalysis》2017,29(3):739-747
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. 相似文献
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《Analytical letters》2012,45(18):2291-2303
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. 相似文献