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Open-Source Low-Cost Wireless Potentiometric Instrument for pH Determination Experiments
Journal of Chemical Education ( IF 3 ) Pub Date : 2017-11-22 00:00:00 , DOI: 10.1021/acs.jchemed.7b00479
Hao Jin 1 , Yiheng Qin 2 , Si Pan 3 , Arif U. Alam 2 , Shurong Dong 1 , Raja Ghosh 3 , M. Jamal Deen 2
Affiliation  

pH determination is an essential experiment in many chemistry laboratories. It requires a potentiometric instrument with extremely low input bias current to accurately measure the voltage between a pH sensing electrode and a reference electrode. In this technology report, we propose an open-source potentiometric instrument for pH determination experiments with Bluetooth wireless connectivity. The hardware is built on a solderless breadboard and mainly composed of an Arduino Nano microcontroller, a 16-bit analog-to-digital converter, two electronic buffer amplifiers, a temperature sensor, and a Bluetooth module with a total cost around $50 (US dollars, including a portable power supply ∼$10). The software is written in Arduino Sketch and the cross-platform Python language, both of which the students can access and modify freely. The instrument was demonstrated with a traditional glass electrode and a custom palladium/palladium oxide pH sensing electrode, and compared with a commercial pH meter. Results showed that both the accuracy and precision of the developed instrument are adequate for teaching purposes. Understanding the workings of electronics of the pH meter can inform the students of the mechanism of pH determination.

中文翻译:

用于pH值测定实验的开源低成本无线电位计

在许多化学实验室中,pH值测定是一项必不可少的实验。它需要具有极低输入偏置电流的电位计,才能准确测量pH感测电极和参比电极之间的电压。在此技术报告中,我们提出了一种开源电位计仪器,用于通过蓝牙无线连接进行pH测定实验。硬件建立在无焊面包板上,主要由Arduino Nano微控制器,16位模数转换器,两个电子缓冲放大器,温度传感器和蓝牙模块组成,总成本约为50美元(美元)。 ,包括便携式电源-约10美元)。该软件使用Arduino Sketch和跨平台Python语言编写,学生均可自由访问和修改这两种语言。该仪器通过传统的玻璃电极和定制的钯/氧化钯pH感测电极进行了演示,并与商用pH计进行了比较。结果表明,所开发仪器的准确性和精密度均足以满足教学目的。了解pH计的电子设备的工作原理可以使学生了解pH测定的机理。
更新日期:2017-11-22
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