Warning: Personnel using this part of GB/T 18414 should have practical experience in formal laboratory work. This section does not address all possible security issues. It is the user's responsibility to take appropriate safety and health measures and ensure compliance with the conditions stipulated in the relevant national laws and regulations. This part of GB/T 18414 specifies the determination of chlorophenols (2,3,5,6-tetrachlorophenol and pentachlorophenol) and their salts and esters in textiles by gas chromatography-electron capture detector (GC-ECD) Methods. This section applies to textile materials and their products.