PFAS retention refers to the process of how per- and polyfluoroalkyl substances (PFAS) are retained in different environmental media, such as soil, water, and plant tissue. PFAS are a group of man-made chemicals that are resistant to heat, water, and oil, and are commonly used in various consumer products and industrial applications. Understanding the mechanisms of PFAS retention is important for predicting their fate and transport in the environment, as well as for developing remediation strategies to reduce their impact on human health and the environment. Research in this area typically involves investigating the sorption, desorption, and transport processes of PFAS in different environmental matrices, as well as the factors that influence their retention behavior.