Method for detecting purity of thioorganic arsenic finished product

The invention belongs to the technical field of thio-organic arsenic finished product detection, and particularly relates to a method for detecting the purity of a thio-organic arsenic finished product. The method comprises the following steps: respectively dissolving a DMMTAV finished product and a DMDTAV finished product in water or an organic solvent to obtain a DMMTAV finished product to-be-detected solution and a DMDTAV finished product to-be-detected solution, detecting the solutions through HPLC-ICP-MS, and determining the response factors x and y of the DMMTAV and the DMDTAV in the HPLC-ICP-MS according to a binary linear equation set by combining total arsenic content, other arsenic component content and response value data. The detection method is easy to operate and good in controllability and repeatability, wherein recovery and determination of all separation forms of the compound are omitted, and the content and purity information of the compound can be obtained while formanalysis is performed, s