Thermogravimetric Loss Data of Typical Black Soil Profile in Northeast China

Soil thermogravimetric analysis was completed using the THEMYSH2 analyzer (SETARAM Instruments, France). After air drying and grinding, the soil sample is sieved through a 100 mesh sieve, and the amount used for determination is approximately 60 mg. The measurement conditions are as follows: use an alumina crucible, with a temperature range of room temperature to 700 ℃, and a heating rate of 5 ℃ · min-1. To eliminate errors caused by hysteresis effect, heat at a constant temperature for 15 minutes when the temperature is raised to 125 ℃. The protective gas is 20 mL · min-1 argon gas, and the purge gas is 20 mL · min-1 pure air. The thermogravimetric data is output every 10 ℃ of heating, and the difference between adjacent two points is used to differentiate the heating temperature once, resulting in a derivative of thermogravimetry (DTG) curve that reflects the dynamic changes in the rate of mass loss of the sample during the heating process. Analyze and process the thermogravimetric loss data using R3.6.3 to obtain the mass loss in the low-temperature and high-temperature sections, and calculate their ratio and temperature at 50% weight loss.