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本文研究了用于重水分析的落滴法中液滴在介质管内的运动规律，发现液滴的运动与Ｓｔｏｋｅｓ定律偏离甚大，且随着滴径──管径比（ｒ／Ｒ）的增加，液滴有一最大降落速度。实验测得了在粼氟甲苯介质中与最大降落速度对应的径比。ｒ／Ｒ＝０．４３－０．４４，此值不随落滴管的直径改变，也不随水样密度改变，从而提出了描述落滴在介质管中运动的经验公式：在极大速度点工作大大减少了落滴体积大小不一所引起的误差，从而缩小了由于室温变化、余液效应、读数不准所引起的误差，使落滴法在分析低浓重水（小于０．４克分子％Ｄ２Ｏ）时精度达±１ｒｏ实验也测定了温度、压力等因素对分析结果的影响。初步研究了影响介质稳定性的因素。
In this paper, we study the motion of droplet in droplet method for heavy water analysis. It is found that the movement of droplet deviates greatly from Stokes law. With the increase of droplet diameter-diameter ratio (r / R) Drops have a maximum landing speed. The experiment measured the radial ratio corresponding to the maximum descending speed in the toluene-fluorotoluene medium. r / R = 0.43-0.44, this value does not change with the dropper diameter, nor with the water sample density changes, thus put forward to describe droplet movement in the media tube empirical formula: work at a very high speed Greatly reducing the error caused by different drop volume, thereby reducing the error caused by room temperature changes, residual liquid effect, inaccurate readings, drop drop method in the analysis of low concentration of water (less than 0.4 mol% D2O) accuracy of ± 1ro experiment also measured the temperature, pressure and other factors on the analysis results. Preliminary study of the factors that affect the stability of the medium.