PentachlorophenolMainly used as a herbicide in rice fields, a preservative and mold inhibitor for textiles, leather, paper, and wood. In 2017, the International Agency for Research on Cancer of the World Health Organization released a preliminary list of carcinogenic substances for reference,Pentachlorophenol is listed as a Group 1 carcinogenIn 2023, it will be included in China's "Key Control New Pollutant List (2023 Edition)",This article refers to HJ 676-2011 "Determination of Phenolic Compounds in Water Quality - Liquid Liquid Extraction/Gas Chromatography Method", using PerkinElmer GC 2400 ™ Gas chromatography is used to analyze and determine phenolic compounds.