Distribution characteristics of polycyclic aromatic hydrocarbons in Chinese flowering cabbage in different periods

The purpose of this study is to investigate the distribution characteristics polycyclic aromatic hydrocarbons (PAHs) in Chinese flowering cabbage at different growth stages, and provide reference for people's daily diet production activities. stages were divided into three periods: seedling stage (from first true leaf expansion fifth leaf), sixth appearance plant buds), stem formation buds harvest stem). contents PAHs roots, stems, leaves each detected by high-performance liquid chromatography, their change patterns studied.