测定溶液氢离子活度,是化学、生物、农业土壤和医疗卫生等的工作人员经常使用的仪器。用玻璃电极测定pH值是现在使用最普遍的方法。近十多年来,我国各仪器厂生产的电子管pH计有十余种,各地研究者所发表的设计资料也不少,虽然测试原理都 Determination of hydrogen ion activity of the solution, is a chemical, biological, agricultural soil and medical and other staff often use the instrument. The most commonly used method for determining pH with glass electrodes is nowadays. In the past ten years or so, there have been more than ten kinds of pH meter tubes in our country’s instrument factories. There are also many design materials published by researchers all over the country. Although all the testing principles