Pretreatment method of soot structure morphology tests under different working conditions

The invention provides a pretreatment method of soot structure morphology tests under different working conditions. The pretreatment method comprises the following steps: collecting a proper amount of diesel engine particles (PM) from the tail gas from a diesel engine, drying the particles at a constant temperature, weighing part of the PM sample, pouring the weighed PM sample into a test tube, adding a proper amount of dichloromethane into the test tube; vibrating the test tube by ultrasonic waves, then subjecting the test tube to a centrifugation treatment; pouring out the upper-layer solution, adding a proper amount of dichloromethane for another time; repeating the previous steps for several times, pouring out the upper-layer solution, placing the test tube on a test tube rack; dropwise adding the solution in the test tube onto a silicon sheet or cooper net by a pipette so as to obtain a sample, and finally detecting the sample on the silicon sheet or copper net to obtain the structure morphology of DS. According to the method, SOF and inorganic salts in DS can be effectively removed, moreover, the particle agglomeration and layering phenomenon are reduced, and the pretreatment method has the advantages that the operation is simple and is easy to control, and the repeatability is high.