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.

基于离子电导率和防水的离子导电玻璃探索了电位溶解的CO_2传感器。 LI_3ZR_2SI_2PO_ <12>（Li^+离子导体）是通过Sol-Gel方法制备的。凝胶在500℃至1000°范围内钙化，并将其压入400kg/cm^2至600kg/cm^2的范围内。通过XRD测量，在低于650℃的钙化样品中观察到由于无定形态引起的光环模式，并且在650℃上方的钙化样品中观察到ZRO_2或SIO引起的峰。 1000时钙化样品的FT-IR光谱与其他样品不同。在500℃和650℃下钙化样品的室温下的离子电导率是大约。 10^<-7> s・ cm^<-1>和ca.10^<-6> s・cm^<-1>。 1000℃的钙化样品不是离子导体。结果表明，通过在浸入水中浸入水中后的盘子减肥，在650 clated样品的550 kg/cm^2处的压盘具有最佳的防水性。通过将圆盘与金属碳酸盐的辅助相结合来获得传感器元件。发现EMF遵循在磷酸盐缓冲液溶液（pH 7.0）30°的87-1308 ppm范围内溶解的CO_2的Nernst方程。通过使用压盘在500℃指示n = 4时使用的压盘在400 kg/cm^2处使用的Nernst斜率。另一方面，在650℃时使用的钙化样品的550kg/cm^2使用按压盘以550kg/cm^2表示n = 4-2。将来将进行进一步适用于海水的实验。