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New Type of Capacitive Detector for Determination of Ions

机译:新型用于离子测定的电容检测器

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A new type of capacitive detector for the determination of ions was designed and fabricated. It consists of two thin layers of gold (thickness 24 nm) sputtered on a glass membrane (20 mm x 20 mm x 0.2 mm) as a dielectric. The upper metal layer of the capacitor had a circular gap (28 mm~2) in the center as the sensing area. The capacitor was coupled with an inductor in parallel configuration to form a resonance circuit, whose frequency was determined. Solutions containing ions applied to the sensing area caused an increase in the capacitance owing to an enhanced charge density on the sensing area. The upper limit of detection for ions was around 10~(-3) mol dm~(-3) of monovalent cations and anions. Higher concentrations did not produce higher capacitance. The lower detection limits were around 5 x 10~(-5) mol dm~(-3). Studies were focused on the influence of the metal film thickness, size of the sensing area, response time, dynamic range, sensitivity, detection limit and long-term stability of the detector. The response was stable and reproducible for over 5 months. The signal responses were compared to conductivity measurements under flow injection conditions with standard solutions and mineral water samples. The results show a good correlation between both methods of measurement.
机译:设计并制造了一种新型的用于确定离子的电容检测器。它由两层金薄层(厚度为24 nm)组成,这些金层溅射在玻璃膜(20 mm x 20 mm x 0.2 mm)上作为电介质。电容器的上部金属层在中心处具有圆形间隙(28 mm〜2)作为检测区域。电容器与并联配置的电感器耦合以形成谐振电路,确定其频率。由于感测区域上电荷密度的增加,包含施加到感测区域的离子的溶液会导致电容增加。离子的检测上限约为一价阳离子和阴离子的10〜(-3)mol dm〜(-3)mol。较高的浓度不会产生较高的电容。最低检测限为5 x 10〜(-5)mol dm〜(-3)。研究集中在金属膜厚度,传感区域大小,响应时间,动态范围,灵敏度,检测极限和检测器的长期稳定性的影响上。反应稳定且可重复5个月以上。在标准溶液和矿泉水样品的流动注射条件下,将信号响应与电导率测量结果进行了比较。结果表明两种测量方法之间具有良好的相关性。

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