Study on the Influence of Burning Temperature on Organic Matter Content Test

Aiming at the Dian Lake sedimentary peat soil, the ignition loss method was used to test the organic matter content. The variation characteristics and internal mechanism of the ignition loss, specific gravity and color of the peat soil at different burning temperatures (75℃, 85℃, 105℃, 200℃, 250℃, 300℃, 350℃, 400℃, 550℃, 650℃, 950℃) were studied. The results show that the ignition loss gradually increases with the rise of temperature and finally stabilizes. According to the variation of ignition loss, it can be divided into four development stages: basically unchanged, rapid growth, slow growth and basically stable stage. The specific gravity of soil increases with the rise of temperature. The color of soil changed from black to dark gray, brown to brick red, reflecting the decomposition loss of organic matter and mineral transformation process at different burning temperatures. On the basis of experimental research, it is suggested that the reasonable burning temperature should be 400℃ to 550℃ to test organic matter content for the Dian Lake peat soil or the same type of soil. The results have certain guiding significance for test of organic matter content and determination of peat soil.