Patent ID: 11933706
Assignee: TOKYO OHKA KOGYO CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method of analyzing a metal component contained as an impurity in a polymer composition that contains a polymer and an organic solvent, the method comprising:
a step (i) of preparing a dispersion consisting of the polymer composition and an acid aqueous solution, wherein the acid in the acid aqueous solution is selected from the group consisting of nitric acid, hydrochloric acid, sulfuric acid, hydrogen fluoride, phosphoric acid, perchloric acid, acetic acid, formic acid, and mixtures thereof;
a step (ii) of separating the dispersion into a dispersoid layer containing the polymer and a dispersion medium layer containing the metal component; and
a step (iii) of quantifying the metal component contained in the dispersion medium layer by a method using inductively coupled plasma mass spectrometry (ICP-MS).