鋼鉄中碳的測定,目前多采用容量分析的燃烧法;或是重量分析的燃烧法。这些方法多基于在氧气流中将鋼鉄中的碳燃烧成为二氧化碳,然后用定碳仪直接測定其中二氧化碳的含量[1][2];或是用氢氧化鋇吸收,再用标准草酸或醋酸溶液回滴过多的氢氧化鋇[3];或是采用浓的氢氧化鉀溶液吸收后称重[4][5]等等,从而求算出鋼鉄样品中碳的含量。它們的优点不仅在于方法快速,且操作甚为簡便,尤其是使用定碳仪,測定一个样品只需三分至四分鈡卽可完成。然而这些方法常需要一整套的高溫电炉設备,有的还需具有精密的玻璃仪器(如定碳仪);同时还需有氧气供应等,因此在我国目前实际情况下,它們的广泛使用,确受到一定的困难和限制。为了鋼鉄分析的需要,我們曾試用自制的土炭炉代高溫电炉,选用錫作为鋼样的助燃剂,同样在氧气流中燃烧鋼样,出来气体用氢氧化鋇溶液将其中的二氧化碳吸收,再用标 Determination of carbon in steel,, the current use of capacity analysis of the combustion method; or gravimetric combustion method. These methods are mostly based on the oxygen flow in the carbon steel combustion carbon dioxide into carbon dioxide, and then determine the direct carbon dioxide content of carbon dioxide [1] [2]; or with barium hydroxide absorption, and then standard oxalic acid or acetic acid solution Back to the excessive barium hydroxide [3]; or the use of concentrated potassium hydroxide solution after weighing [4] [5] and so on, so as to calculate the carbon content of steel samples. Their advantages lie not only in fast method and ease of use, but especially in the case of a carbonator, which requires only one-third to four-quarters of a sample to be measured. However, these methods often require a complete set of high-temperature electric furnace equipment, some also need to have sophisticated glass instruments (such as carbon determination instrument); also need oxygen supply, etc. Therefore, in our current actual situation, their widespread use, Do have some difficulties and limitations. In order to analyze the needs of steel 我, we have tried self-made high-temperature earth-fired furnace of potash, tin as a steel-like combustion agent, the same burning in the oxygen flow of steel samples, out of gas with barium hydroxide solution to which the carbon dioxide absorption, and then Standard