Principle: The first section uses an electric furnace to heat and burn the sample, the second section uses an electric furnace to burn the products that have not been oxidized after pyrolysis in the oxidation test, and the third section uses an electric furnace to supplement the entire combustion process, which is carried out under closed oxygen supply.

Equipment: Porcelain boat, grinding plug, glass tube with legs.

The precautions are as follows:

(1) During the combustion process, it is necessary to meet the conditions that can completely burn the sample. No matter how many reactions need to be experienced during the combustion process, the carbon and hydrogen in the sample can ultimately be quantitatively converted into carbon dioxide and water.

(2) It is necessary to remove products that interfere with the reaction, so that only pure carbon dioxide and water enter the absorption device after the combustion reaction.

(3) Appropriate absorbents must be selected to quantitatively absorb carbon dioxide and water; At the same time, it is necessary to maintain a certain gas flow rate to allow sufficient time for the absorption reaction to proceed, and the gas flow rate is also a necessary condition to ensure complete combustion.