Mitigation of Glyphosate Ecotoxicity by Vacuum-Uv Treatment

Sigrid Bjergbakke Fogh, Oihane Del Puerto Bengoetxea, Nuno P.F. Gonçalves, Peter Roslev

Research output: Contribution to book/anthology/report/conference proceedingConference abstract in proceedingResearchpeer-review

Abstract

N-(phosphonomethyl)glycine (glyphosate) is the most widely used active ingredient in non-selective broad-spectrum herbicide formulations. Glyphosate is approved for both professional and non-professional use and is frequently detected as a contaminant in surface waters and groundwater. The environmental toxicity of glyphosate to non-target organisms has been considered low but adverse effects have been observed in organisms from different trophic levels including bacteria, algae, crustaceans, amphibians, and fish. In this study, we examined whether Vacuum UV and UV-C treatment of glyphosate in drinking water can degrade this herbicide and decrease the toxicity to non-target organisms. VUV irradiation of water can generate different chemical radicals including hydroxyl radicals that can potentially degrade environmental contaminants. The UV mediated degradation of glyphosate was quantified by LC analysis, and changes in toxicity was measured using bioassays with the bacterium Bacillus subtilis and the green microalga Raphidocelis subcapitata. The bioassays were applied to integrate biological effect of all constituents in the water samples before and after UV treatment including transformation products. The results showed that exposure of glyphosate to VUV (185 nm) and UV-C irradiation (254 nm) significantly decreased concentrations of glyphosate and decreased the toxicity to aquatic test organisms as indicated by increasing EC50 values. This effect was observed in different drinking water types and at different UV doses (Joule/cm2), and there was a direct positive correlation between irradiation dose and decreases in toxicity to the test organisms. Several reactive oxygen species were generated during the VUV and UV-C treatment and likely interacted with aqueous glyphosate. The less toxic degradation product aminomethylphosphonic acid (AMPA) and orthophosphate were among the transformation products observed after UV-C and VUV treatment. The study suggests that VUV and UV-C mediated photolysis can decrease concentrations of glyphosate and generate less toxic products with decreased overall toxicity to aquatic organisms.
Original languageEnglish
Title of host publicationAbstract Book
Number of pages1
PublisherSociety of Environmental Toxicology and Chemistry
Publication date2021
EditionAbstract Book
Pages148
Publication statusPublished - 2021
EventSETAC Europe 2021 Annual Meeting: GLOBAL CHALLENGES. AN EMERGENCY FOR ENVIRONMENTAL SCIENCES. - Digital
Duration: 3 May 20216 Jun 2021
Conference number: 31
https://europe2021.setac.org/

Conference

ConferenceSETAC Europe 2021 Annual Meeting
Number31
LocationDigital
Period03/05/202106/06/2021
Internet address

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