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溶胶-凝胶法修饰的一次性氯离子选择性电极的研究 总被引:4,自引:0,他引:4
溶胶-凝胶法(sol-gel)对固定试剂的种类和数量具有可调性,又具有保持性能稳定的潜在优势;一些小分子离子可以自由进出sol-gel的孔径,使得sol-gel基质内外浓度相等,因而可制备化学电极。本文通过正硅酸乙酯[TEOS]在适宜的酸催化下,水解制得电极材料,采用溶胶.凝胶掺杂技术,成功地修饰了新型氯离子选择性电极,这种电极的线性范围和AgCl-AgS2固态膜电极、 相似文献
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基于溶胶-凝胶技术的丁氯喘电极 总被引:3,自引:0,他引:3
报导了一种以硅钨酸为活性物质 ,用溶胶 凝胶技术制做的新型丁氯喘电极。电极有良好的能斯特响应。斜率为 5 5mV以上 ,线性范围为 1 .0× 1 0 -1~5 .0× 1 0 -5mol L ,检测下限为 2 .0× 1 0 -5mol L ,适宜的pH为 4.2~ 8.7。 相似文献
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制备了一种以硅钨酸为定域体试剂,用溶胶-凝胶技术制作的新型维生素B6电极,详尽讨论了电极性能的影响因素。电极斜率为58.0 mV/dec,线性范围为1.0×10-2~4.0×10-6mol/L,检测限为2.5×10-6mol/L。该电极易于批量生产和微型化,用于样品分析,结果令人满意。 相似文献
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研制了一种用溶胶 凝胶技术包埋电活性物质的银离子选择电极。研究了包埋过程的变量参数及电极的响应机理。电极Nernst响应范围为 1.0× 10 - 1~ 1.0× 10 - 5mol·L- 1,斜率为5 5 .5mV·pc- 1,检出限为 3.1× 10 - 6mol·L- 1。该电极响应快 ,体积小 ,制作简单 ,使用方便 ,具有坚固耐磨 ,可在严酷条件下使用的特点。此研究对进一步研制溶胶 凝胶ISFET化学传感器和生物传感器具有探索意义 相似文献
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The electrochemical behavior of maltol on a glassy carbon (GC) electrode was investigated. The results were applied to differential pulse voltammetric determination of maltol in beverages pretreated by ultrafiltration. Under the optimum experimental conditions, the linear range is 1×10−5 to 6×10−4 mol l−1 maltol and the relative standard deviation for 0.4 mmol l−1 maltol is 0.6% (n=9). The detection limit was 5 μmol l−1. Furthermore, silica sol-gel film on GC electrode could be used as suitable selective membrane, which integrated selective membrane on the electrode and substituted for the pretreatment of ultrafiltration. Under the above conditions, maltol was determined by semi-differential linear sweep voltammetry at a silica sol-gel modified GC electrode in the concentration range of 5×10−6 to 5×10−4 mol l−1. The detection limit was 2 μmol l−1 and the relative standard deviation for 0.1 mmol l−1 maltol was 0.7% (n=7). The proposed method is of sensitivity, simplicity, rapidness and no contamination. It had been applied to the direct determination of maltol in beverages such as grape wines, drinks and beers without any pretreatment. The results obtained with the present method were satisfactory with those obtained by spectrophotometry. It could be used as a simple and practical method for the determination of the flavor enhancer maltol in beverages. 相似文献
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A new selective membrane electrode for the measurement of lead activities is proposed. The preparation of active components of the membrane is described. The ready made electrode insert was used in which the PVC membrane was replaced by the prepared membrane. Experimental results document the emf response of profile, the selectivity, the detection limit and the effect of the sample media. The prepared electrode was applied for the measurement of the lead concentration in water samples. Activated alumina micro-column was used for the pre-concentration of lead in the analyzed water samples. The obtained results were compared with those determined by atomic absorption spectrometry. 相似文献
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I. Isildak 《Chromatographia》1999,49(5-6):338-342
Summary An all solid-state contact tubular PVC-matrix membrane electrode has been applied for potentiometric detection of inorganic
and organic monovalent anions using phosphate and hydrogen phosphate eluents at low concentrations. This is a “monovalent
detection method” as the selectivity of the electrode towards monovalent anions results in some other anions being undetected
unless the concentration of those other anions is higher than 10−3 mol dm−3 in the sample solution injected. It takes only eight minutes to complete the separation with a good resolution. Theoretical
and practical considerations are discussed, and in particular, sensitivity, linearity, detection limit and dynamic behaviour
are presented.
The use of an all solid-state contact bromide-selective electrode as a detector offers so far the best simultaneous sensitivity
toward all anions when compared with other detection methods. Determination of Cl− and NO3
− ions in river, rain and drinking water samples without any further sample preconcentration has been successfully achieved.
The detection limit is sub-ppb for most of anions in a 20 μL injection volume. 相似文献
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A novel potentiometric zirconium - PVC matrix membrane sensor incorporating bis(diphenylphosphino) ferrocene as an electroactive material and tris(2-ethylhexyl)phosphate as solvent mediator is described. In mixed acetate buffer solution of pH 4.8, the sensor displays a rapid and linear response for zirconium ion over the concentration range 1.0 × 10−1 to 1.0 × 10−7 mol L−1 with a good slope of 59.7 ± 0.3 mV per decade and detection limit 1.8 × 10−8 mol L−1. The best performance was obtained with membrane composition 33% PVC, 65% TEHP, 1% NaTPB and 1% ionophore. The proposed electrode revealed excellent selectivity for zirconium ion over a wide variety of alkali, alkaline earth, transition and heavy metal ions and could be used in a pH range of 4.15-7.8. The electrode was applied for at least 1 month without any considerable divergence in the potential responses. The practical utility of the electrode has been demonstrated by its use as an indicator electrode in the potentiometric titration of zirconium ions with sodium fluoride and in determination of zirconium ion in some alloy, tape and waste water samples. 相似文献
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In this study, we investigate highly efficient sonogel carbon electrode (SGC/TiO2) modified with nanostructured titanium dioxide synthesized via sol-gel method employing surfactant template for tailor-designing the structural properties of TiO2. The stable SGC/TiO2 electrode detects catechol, a neurotransmitter, in the presence of ascorbic acid, a common interferent, using cyclic voltammetry. A possible rationale for the stable catechol detection of SGC/TiO2 electrode is attributed to most likely the adsorption of catechol onto highly porous TiO2 (surface area of 147 m2 g−1 and porosity of 46.2%), and the formation of C6H4(OTi)2 bond between catechol and TiO2. The catechol absorbed onto TiO2 rapidly reaches the SGC surface, then is oxidized, involving two electrons (e−) and two protons (H+). As a result, the surface of TiO2 acts as an electron-transfer accelerator between the SGC electrode and catechol. In addition to the quantitative and qualitative detection of catechol, the SGC/TiO2 electrode developed here meets the profitable features of electrode including mechanical stability, physical rigidity, and enhanced catalytic properties. 相似文献