A method for quantifying polymer species in a sample containing polymer particles, wherein a) polymer-specific enrichment factors are determined by carrying out an electro-separation for different pure polymer species, wherein polymer species particles of a predefined particle size or a predefined particle size range at predefined separation parameters are electrically charged and electrostatically separated in collection containers (6, 7, 8, 15, 16) arranged next to one another, wherein a polymer-specific enrichment factor of the portion of the separated polymer species contained in the respective collection container (6, 7, 8, 15, 16) is determined for each collection container (6, 7, 8, 15, 16), or b) polymer-specific enrichment factors from different pure polymer species and depending on the separation parameters are provided from a database, c) a sample containing polymer particles is provided, wherein the particles have a size which corresponds to the predefined particle size or the predefined particle size range, d) an electro-separation of the sample containing polymer particles is carried out with the predefined separation parameters, wherein the polymer particles of the sample containing polymer particles are electrically charged and electrostatically separated in the collection containers (6, 7, 8, 15, 16) arranged next to one another, e) a specific enthalpy and/or a specific heat capacity change of the polymer particles of the sample containing polymer particles enriched in the respective enrichment container is determined in each one of the predefined collection containers (6, 7, 8, 15, 16), and f) the mass percentages of the polymer species contained in the sample containing polymer particles are determined from the determined specific enthalpies and/or the determined specific heat capacity changes and the polymer-specific enrichment factors. a) polymer-specific enrichment factors are determined by carrying out an electro-separation for different pure polymer species, wherein polymer species particles of a predefined particle size or a predefined particle size range at predefined separation parameters are electrically charged and electrostatically separated in collection containers (6, 7, 8, 15, 16) arranged next to one another, wherein a polymer-specific enrichment factor of the portion of the separated polymer species contained in the respective collection container (6, 7, 8, 15, 16) is determined for each collection container (6, 7, 8, 15, 16), or b) polymer-specific enrichment factors from different pure polymer species and depending on the separation parameters are provided from a database, c) a sample containing polymer particles is provided, wherein the particles have a size which corresponds to the predefined particle size or the predefined particle size range, d) an electro-separation of the sample containing polymer particles is carried out with the predefined separation parameters, wherein the polymer particles of the sample containing polymer particles are electrically charged and electrostatically separated in the collection containers (6, 7, 8, 15, 16) arranged next to one another, e) a specific enthalpy and/or a specific heat capacity change of the polymer particles of the sample containing polymer particles enriched in the respective enrichment container is determined in each one of the predefined collection containers (6, 7, 8, 15, 16), and f) the mass percentages of the polymer species contained in the sample containing polymer particles are determined from the determined specific enthalpies and/or the determined specific heat capacity changes and the polymer-specific enrichment factors.