Attenuation of toxicity and occurrence of degradation products of the fungicide tebuconazole after combined vacuum UV and UVC treatment of drinking water

• DOI: 10.1007/s11356-022-19691-0
• Publication Date: 2022-04-02T01:10:41Z
• Authors: Oihane Del Puerto; Nuno P. F. Gonçalves; Claudio Medana; Alessandra Bianco...; Peter Roslev
• Keywords: Tebuconazole; Ecotoxicity; Luminescent bacteria; Pyrimethanil; Azole

Antifungal azoles are the most frequently used fungicides worldwide and occur as active ingredients in many antifungal pharmaceuticals, biocides, pesticides. Azole frequent environmental contaminants can affect quality of surface waters, groundwater, drinking water. This study examined potential combined vacuum UV (185 nm) UVC (254 irradiation (VUV/UVC) azole fungicide tebuconazole transformation product 1,2,4-trizole on degradation changes ecotoxicity. In vivo ecotoxicity was before after treatment using bioassays with test organisms from different trophic levels to integrate biological effect parent compound products. The battery included luminescent bacterium Aliivibrio fischeri, Gram-positive Bacillus subtilis, fungus Fusarium graminearum, green microalga Raphidocelis subcapitata, crustacean Daphnia magna. VUV/UVC water efficiently degraded at µg/L-mg/L level resulted products lower toxicity than compound. A direct positive correlation observed between applied dose (fluence, J/cm2), disappearance tebuconazole, decrease process does not require addition supplementary oxidants or catalysts our suggests that VUV/UVC-mediated photolysis overall represent a potentially environmentally friendly method.