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Development of dissolved CO_2 sensor for sea-water using ion conducting glass-based transducer

使用离子导电玻璃传感器开发海水溶解CO_2传感器

基本信息

批准号：
17550134
负责人：
MATAYOSHI Naoko
金额：
$ 2.3万
依托单位：
University of the Ryukyus
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

Potentiometric dissolved CO_2 sensor was explored based on ion conducting glass which has ionic conductivity and water-resistance. Li_3Zr_2Si_2PO_<12> (Li^+ion conductor) was prepared by a sol-gel method. The gel was calcined in the range from 500℃ to 1000℃ and pressed into discs in the range from 400Kg/cm^2 to 600 Kg/cm^2. By XRD measurement, the halo patterns due to amorphous state were observed in the calcined samples below 650℃, and the peaks due to ZrO_2 or SiO were observed in the calcined samples above 650℃. FT-IR spectrum of the calcined sample at 1000℃ was different from those of the other samples. Ionic conductivity at room temperature of the calcined samples at 500℃ and 650℃ were ca. 10^<-7> S・cm^<-1> and ca.10^<-6> S・cm^<-1>, respectively. The calcined sample at 1000℃ was not ionic conductor. It was shown that the pressed disc at 550 Kg/cm^2 of the calcined sample at 650℃ has the best water-resistance of the other discs by measurement of the weight-loss of the disc after immersed in water for several weeks. Sensor elements were obtained by combining the discs with an auxiliary phase of metal carbonates. The EMF was found to follow the Nernst's equation of dissolved CO_2 in the range of 87-1308 ppm in phosphate buffer solution (pH 7.0) at 30℃. The observed Nernst slope by using of the pressed disc at 400 Kg/cm^2 of the calcined sample at 500℃ indicated n=4. On the other hand, the observed slopes by using of the pressed disc at 550Kg/cm^2 of the calcined sample at 650℃ indicated n=4-2. Further experiments, which apply to sea-water, will be made in the future.

基于具有离子导电性和耐水性的离子导电玻璃，研制了电位式溶解二氧化碳传感器。采用溶胶凝胶法制备了Li_3Zr_2Si_2PO_(12)(Li~(2+)离子导体)。凝胶在500~1000℃范围内焙烧，在400~600 kg/cm~2范围内压成片状。X射线衍射仪测量发现，在650℃以下的样品中观察到了无定形的晕图，而在650℃以上的样品中观察到了由ZrO2或SiO_2引起的谱峰。在1000℃处，焙烧样品的红外光谱与其他样品不同。在500℃和650℃下焙烧样品的室温离子电导率分别为约10^&lt；-7&gt；S·cm；-1&gt；和约10^&lt；-6&gt；S·cm&lt；-1&gt；在1000℃下焙烧的样品不是离子导体。通过对压片在水中浸泡数周后的失重率的测量，发现在650℃下以550 kg/cm2的压力压制的压片具有最好的耐水性。传感器元件是通过将圆盘与金属碳酸盐的辅助相结合而获得的。在30℃磷酸盐缓冲溶液中，溶解CO_2的电动势在87-1308ppm范围内符合能斯特方程。在500℃时，用400 kg/cm~2压片测得的能斯特斜率为n=4。而在650℃下，用550 kg/cm~2压片测得的能斯特斜率为n=4-2。未来还将进行适用于海水的进一步实验。