混合溶剂中性载体镁离子选择性微电极的研究 |
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引用本文: | 胡忠民,叶风华,赵平三,漆德瑶.混合溶剂中性载体镁离子选择性微电极的研究[J].化学学报,1991,49(12):1483-1486. |
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作者姓名: | 胡忠民 叶风华 赵平三 漆德瑶 |
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作者单位: | 上海工业大学化学化工系,上海工业大学化学化工系,上海工业大学化学化工系,上海工业大学化学化工系 上海,200072 86级分析专业毕业生,上海,200072 86级分析专业毕业生,上海,200072,上海,200072 |
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基金项目: | 国家自然科学基金,上海市青年基金的课题 |
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摘 要: | 用氯化石腊和邻硝基苯辛醚为混合溶剂制备中性载体ETH5214的镁离子选择性微电极,相对于钾离子的电位选择性系数较单独以邻硝基苯辛醚为溶剂的ETH5214镁微电极改善0.9个数量级。在纯MgCl~2和在含细胞内典型离子背景的MgCl~2溶液中,响应斜率为Nernst响应,检测下限分别为4×10^-^7mol.dm^-^3和2×10^-^5mol.dm^-^3。在pH3.5-9.5范围内,氢离子对电极的电位响应无影响。测量的重现性良好。电极的实用响应时间(t~9~5)≤3s,有效寿命长于5天。
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关 键 词: | 微电极 离子选择性 镁离子 中性载体 离子选择电极 硝基苯 石腊 响应时间 |
Magnesium-selective microelectrode based on a neutral carrier with mixed solvent |
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Institution: | Shanghai Univ Technology, Dept Chem & Chem Engn.Shanghai(200072) |
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Abstract: | An intracellular ion-selective microelectrode based on the neutral carrier ETH5214 with chlorinated paraffin (60% Cl) and o- nitrophenyloctylether (o-NPOE) as solvents is presented. Compared with the sensor based on the same ionophore with solvent o-NPOE, the potentiometric selectivity factor for Mg^2^+ with respect to K^+ has been improved by 0.9 order of magnitude. The microelectrode shows a near-Nernstian response in pure MgCl~2 solutions and in the MgCl~2 solutions at a typical intracellular ion background, with detection limits of 4×10^-^7 mol.dm^-^3 and 2×10^-^5 mol.dm^-^3, respectively. The H^+ does not interfere with the emf response of the electrode in pH 3.5-9.5. The lifetime of the microelectrode cell assembly is longer than 5 days, and the response time (t~9~5)≤3s. |
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Keywords: | MICROELECTRODE ION SPECIFIC ELECTRODE MAGNESIUM ION ION SELECTIVE ELECTRODE NITROBENZENE PARAFFIN WAXES RESPONSE TIME |
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