在经典法中氧的定量测定最常用的是Unterzaucher提出的热分解重量测定法,操作复杂不易掌握,影响因素多,因此误差较大。多年来国外虽然有大量的研究工作报导,但至今在有机元素分析中氧仍然被认为是最难测定的元素之一。国内普遍应用“减差法”间接测氧,由于多种元素分析误差的叠加准确度很低。 In the classical method, the most commonly used method for the quantitative determination of oxygen is the pyrolysis gravimetric method proposed by Unterzaucher. The operation is complicated and difficult to grasp, and there are many influencing factors, so the error is larger. Over the years, although there are a lot of foreign studies have reported, but so far in the organic elemental analysis of oxygen is still considered one of the most difficult to determine the elements. Domestic commonly used “subtraction method” indirect oxygen measurement, due to a variety of elemental analysis of the error of the superposition accuracy is very low.