High-temperature combustion is a particularly effective tool for analyzing carbon and sulfur in a variety of materials. This article describes a typical combustion system and addresses key application considerations, including accelerators that aid in the combustion process; filters, traps, and catalysts that keep unwanted oxide compounds in check; and choices in infrared and thermal-conductive detectors for measuring CO<sub>2</sub> and SO<sub>2</sub>. The article also explains the difference between total and selective combustion, and discusses the impact on sample preparation and test results.
Inert gas fusion is a method of determining the quantitative content of gases in ferrous and nonferrous materials where gases, such as hydrogen, nitrogen, and oxygen, are physically and chemically adsorbed by the materials and later removed and swept by from the fusion area by an inert carrier gas. This article describes the operating principles and sample selection of inert gas fusion. It explains the mechanisms involved in the introduction of fusion gas, separation and detection of fusion gas by thermal-conductive and infrared detection methods. Additionally, the article explains the methods used for analyzing trace amounts of nitrogen, oxygen, and hydrogen in the carrier mediums, providing examples that aid in solving several problems.