用落滴法测定重水含量,由于仪器简单,操作容易,试样只需10微升,所以迄今仍是一种通行的方法,在标记技术中得到广泛的应用。对于这一成熟的方法,近年的研究侧重于落滴时间的自动记录,有光电指示法和水滴通过两极片吋电阻变化法,也有用热敏元件构成的交流电桥以控制温度恒定至0.0005℃,然而本方法有两个重要问题:管壁 With droplet method for the determination of heavy water content, due to the simple instrument, the operation is easy, the sample only 10 microliters, so far is still a popular method, in marking technology has been widely used. In this mature approach, recent studies have focused on the automatic recording of drop time, photoelectric indication and water drop through the two-electrode resistance change, but also the AC bridge composed of thermal sensors to control the temperature to 0.0005 ℃, However, this method has two important issues: tube wall