Valve-Actuator-Integrated Reference Electrode for an Ultra-Long-Life Rumen pH Sensor
Valve-Actuator-Integrated Reference Electrode for an Ultra-Long-Life Rumen pH Sensor
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DOI：
10.3390/s20051249
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发表时间：
2020-03-01
期刊：
影响因子：
3.9
通讯作者：
Itoh, Toshihiro
中科院分区：
文献类型：
--
作者：
Higuchi, Shogo;Okada, Hironao;Itoh, Toshihiro
我们展示了一种新开发的Ag/AgCl参比电极-与阀致动器两年或更长时间的瘤胃pH值监测。先前关于pH传感器的研究报道了Ag/AgCl参比电极的短寿命是由内部电解质的流出引起的。我们在液接界中引入了一个阀门驱动器，通过间歇测量来减少流出。结果表明，该传感器在液接开关时的电位变化小于0.5mV，响应时间小于0.083s。在使用瓣膜-致动器集成参比电极（VAIRE）的24小时电位测量中，瓣膜每小时致动一次，电位的标准偏差为0.29 mV。根据电解质流出量计算，VAIRE的寿命估计为2.0年，明显长于传统参比电极的寿命。使用VAIRE的pH传感器估计可运行2.0年，pH误差
We demonstrated a newly developed Ag/AgCl reference electrode- with a valve-actuator for two years or longer rumen pH monitoring. Previous studies on pH sensors reported that the short lifetime of Ag/AgCl reference electrodes is caused by an outflow of internal electrolyte. We introduced a valve-actuator into a liquid junction to reduce the outflow by intermittent measurement. The results indicated that the potential change when switching the liquid junction was less than 0.5 mV and its response time was less than 0.083 s. In the 24-h potential measurement with the valve-actuator-integrated reference electrode (VAIRE), the valve was actuated once every hour, and the standard deviation of the potential was 0.29 mV. The lifetime of the VAIRE was estimated at 2.0 years calculating from an electrolyte outflow, which is significantly longer than that of conventional reference electrodes. A pH sensor using the VAIRE was estimated to operate for 2.0 years with the pH error