采用落滴法测定重水样品中的D含量,是以样品需量很小为其优点。当用此法分析高浓重水吋,除须避免样品的稀释外,重要的是选择适宜的介质。等提出用二苯甲烷和α-氯萘的混合介质,Kellomaki等用二苯甲烷和溴苯的混合介质,而黄爱伦等则建议用柴油馏份和。α-氯萘的混合介质。鉴于二苯甲烷当室温为固体,而窄沸程的柴油馏份制取费劲,我们在实验中采用苯甲酸正丁酯为轻组份,它 The determination of D in heavy water samples by dropping-drop method is based on the advantage of small sample requirement. When using this method to analyze highly concentrated water, it is important to choose the appropriate medium, except to avoid dilution of the sample. Et al. Proposed a mixed medium of diphenylmethane and α-chloronaphthalene, a mixed medium of diphenylmethane and bromobenzene by Kellomaki et al. α-chloronaphthalene mixed medium. Given that diphenylmethane is solid at room temperature and that the narrow boiling range diesel fraction is very robust, we used n-butyl benzoate as a light component in our experiments