Method for detecting concentration of micro-plastics in soil by using thermogravimetric analysis method and application

The invention discloses a method for detecting the concentration of micro-plastics in soil by using a thermogravimetric analysis method and application. The method comprises the following steps: (1) uniformly mixing a micro-plastic standard substance with soil, and preparing a micro-plastic soil standard mixture with at least five concentration gradients; (2) pyrolyzing the micro-plastic soil standard mixture by using a thermogravimetric analyzer, recording the maximum weight loss rate and/or the residual weight rate, and then drawing a standard curve according to the relationship between the concentration of the micro-plastic soil standard mixture and the maximum weight loss rate and/or the residual weight rate to obtain a linear equation; and (3) pyrolyzing the to-be-detected soil sample by using the thermogravimetric analyzer, recording the maximum weight loss rate and/or residual weight rate, and then calculating according to the linear equation to obtain the concentration of the micro-plastic in the to-b