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

电位计量分解CO_2传感器是一个基于离子导电玻璃的例子，其中有离子导电性和水耐药性。Li_3 Zr_2 Si_2 PO_<12>（Li^+ion conductor） was prepared by a sol-gel method。gel was calcined in the range from 500℃ to 1000℃ and pressed into discs in the range from 400 Kg/cm^2 to 600 Kg/cm^2。通过XRD测量，光环模式在650 ° C以下观察到反常状态，而在650 ° C以上观察到ZrO_2或Sio的峰值在650 ° C以上观察到。在1000℃下，计算出的样品的FT-IR光谱与其他样品的不同。在500 ° C和650 ° C的室内温度下离子活性在加利福尼亚州。10^\-7&gt; S·cm^\-1&gt; and ca.10^\-6&gt; S·cm^\-1&gt;， respectively。在1000℃下计算的样品不是离子导体。这是在650℃的计算样本上显示的压力光盘在550千克/厘米^2上有其他光盘的最佳水抵抗力，这是在几个星期内被淹没的光盘的重量损失。传感器元件是由光盘与金属碳含量的辅助阶段组合而成的。在30℃下，在磷酸缓冲液溶液（pH 7.0）的87-1308 ppm的范围内发现了Nernst's溶解CO_2当量的电磁场。Observed Nernst slope by using of the pressed disc at 400 Kg/cm^2 of the calcined sample at 500℃ indicated n=4。在另一手上，在650℃下使用压力盘上550公斤/厘米^2的计算样本n=4-2。“进一步的实验，无论是什么应用于海水，都将在未来产生。”

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.