The influence of toxic substances in the environment on the activity of antioxidant enzymes in the tissues of Ceratophyllum demersum and Egeria densaOlga Makurina, Marina Goryacheva, Vladimir Lutsay and Yulia KropovaE3S Web of Conf., 462 (2023) 02047DOI: https://doi.org/10.1051/e3sconf/202346202047