Preparation method of polyvinyl chloride plastic standard sample containing three phosphate flame retardants

The invention discloses a preparation method of a polyvinyl chloride plastic standard sample containing three phosphate ester flame retardants, which comprises the following steps: preparing master batches, diluting the master batches to prepare a standard sample with a target concentration, taking polyvinyl chloride (PVC) as a matrix, adding the three phosphate ester flame retardants and a processing aid, with the content of each of the three phosphate ester flame retardants being 0.0005-0.0025 wt%, and the content of each of the three phosphate ester flame retardants being 0.0005-0.0025 wt%. The obtained standard sample is good in uniformity, the stability of the sample in a continuous monitoring period is good, and no obvious trend change is generated within 4 years; the relative standard uncertainty of synthesis of the phosphate flame retardant in a sample is less than 6%; the prepared polyvinyl chloride plastic standard sample containing three phosphate ester flame retardants can be used for method verif