Today, humanity could be said to be immersed in the "plastic age," given that its use in various fields has reached extraordinary proportions, progressively and massively displacing other traditional materials. In the specific case of the marine environment, the threat of plastic has long been ignored, although its severity has only recently been recognized. The tourism sector generates enormous quantities of waste, largely plastic, which ends up in the sea, especially when tourist destinations are located on the coast, as is the case in the Canary Islands. The project to be developed aims to analyze water and sand samples from the beaches of Tenerife to determine their phthalate content (expanding the group of compounds to be analyzed is not ruled out), which originate mostly from plastic waste dumped into the sea. Phthalates are compounds classified as endocrine disruptors and have a significant capacity to migrate from the plastics that contain them. Determining the presence and quantity of these compounds in the coastal waters and beach sands of Tenerife will, to some extent, reveal the degree of coastal pollution with respect to these compounds. This project is not a continuation of any previous project by the IP research group, although it is obviously related to the group's work in recent years regarding the development of analytical methodologies and the analysis of environmental samples. To date, no study of this kind has been carried out in the Canary Islands, although similar studies have been conducted along parts of the Mediterranean and Cantabrian coasts. In both cases, the presence of these types of pollutants in the waters and marine sediments of those areas was demonstrated.