METHOD OF DETERMINING TRACE METALLIC IMPURITIES IN FLUOROPOLYMER AND PROCESS FOR PRODUCING FLUOROPOLYMER THEREBY

摘要

In order to quantitatively determine a metal impurity contained in a fluorine-containing polymer directly, and also to improve a detection limit of the metal quantitative determination, there is provided a method for the quantitative determination of a trace amount of a metal impurity contained in a fluorine-containing polymer using a flameless atomic absorption spectrophotometer wherein a predetermined amount of a sample of the polymer containing the metal to be quantitatively determined is incinerated under incineration conditions including an incineration temperature in the range of about 400 to 1200 °C and an incineration period of at least about 100 seconds, and then an absorbance of the incinerated sample as such is measured using the flameless atomic absorption spectrophotometer. In addition, there are provided a process for the production of the fluorine-containing polymer characterized in that the trace amount of the metal impurity contained in the fluorine-containing polymer is quantitatively monitored by means of the method, and a process for the production of the fluorine-containing polymer characterized in that the trace amount of the metal impurity contained in the fluorine-containing polymer is quantitatively determined by means of the method according to the method.