Abstract: There is provided a precisely quantitative measurement method of a hydrocarbonaceous polymerization inhibitor component in a fluorine-containing olefinic monomer, which inhibitor component is contained in the monomer in such a trace amount that it cannot be detected by a gas chromatography. In the method, an ultraviolet absorption spectrum of a concentrated sulfuric acid is measured after it is contacted with the fluorine-containing olefinic monomer and the concentration of the polymerization inhibitor is obtained based on an absorbance of the spectrum and a calibration curve which has been beforehand obtained.

Abstract: The invention provides a method for removing the fine particles deposited on an article of fluorine-containing resin, the method comprising conducting at least one of the procedures of:(i) maintaining the article of fluorine-containing resin at a high temperature,(ii) maintaining the article in the atmosphere of fluorine-containing gas, and(iii) bringing the article into contact with a polar solvent or an aqueous solution of polar solvent.