CICTA 2021 - 9th Iberoamerican Congress on Contamination and Environmental Toxicology - was held in Blumenau, Brazil, from the 29th of November to the 2nd of December, and MARlab students Isabella Bramatti, Laura Silva and Professor Marta Martins participated with the presentation of the works entitled "Do microplastics affect microbial-mediated detoxification of mercury in aquatic ecosystems?" and "Interaction mechanisms of Polycyclic Aromatic Hydrocarbons in fish primary hepatocytes: from molecular to genotoxic toxic effects".