This standard replaces GB/T 23243-2009 “Determination of perfluorooctane sulfonates (PFOS) in the food packaging material - High performance liquid chromatography-tandem mass spectrometry”.

Compared with GB/T 23243-2009, the major changes of this standard are as follows:

——the name of this standard has been revised to “National food safety standard Food contact materials and articles Determination of perfluorooctane sulfonate (PFOS) and perfluorooctanic acid (PFOA)”;

——the application scope has been added;

——the determination of perfluorooctanic acid (PFOA) has been added; 

——the preparation method of the sample has been added;

——the purification step has been added, and weak anion-exchange solid phase extraction column has been used for purification;

——the sensitivity of the determination method has been improved.