Algae 4 Aquatic environments Atrazine 4 Biosensing Techniques 4 Biosensor 4 Biosensors 4 Chlamydomonas reinhardtii 4 Chlorella vulgaris 4 Chlorophyll fluorescence 4 DCMU 4 Diuron 4 Environmental Monitoring 4 Fluorescence enhancement 4 Fresh Water 4 Herbicides 4 Humans 4 Hydrogel 4 Hydrogels 4 Microalgae 4 Microorganisms 4 Pseudokirchneriella subcapitata 4 Silica 4 Sol-gel 4 Sol-gels 4 Two-step procedure 4 Water Pollutants, Chemical 4 Weed control 4 article 4 atrazine 4 chemistry 4