Degradation of the Neonicotinoid Thiamethoxam by the Solar-Fenton Process: Theoretical Insights and Ecotoxicological Evaluation

30 Pages Posted: 18 Aug 2022

See all articles by Rone da Silva Barbosa

Rone da Silva Barbosa

affiliation not provided to SSRN

Grasiele Soares Cavallini

affiliation not provided to SSRN

Állefe Barbosa Cruz

affiliation not provided to SSRN

Douglas Henrique Pereira

affiliation not provided to SSRN

Nelson Luis Gonçalves Dias de Souza

affiliation not provided to SSRN

Thayrine Dias Carlos

affiliation not provided to SSRN

Amadeu M.V.M. Soares

Universidade de Aveiro - Department of Biology

Carlos Gravato

University of Lisbon - Centre for Environmental and Marine Studies (CESAM)

Renato Almeida Sarmento

affiliation not provided to SSRN

Abstract

Neonicotinoids are highly consumed pesticides, such as the insecticide Cruiser®/CRZ® (Thiamethoxam/TMX). They exhibit effects on non-target organisms and for these their slow degradation becomes a potential problem. Advanced oxidative processes (AOPs), such as photo-Fenton, chemically transform organic contaminants, forming byproducts with unknown toxicity. The effects were tested using the planarian Girardia tigrina exposed to the CRZ formulation, and the resulting byproducts after the process. Damage was assessed by acute (LC 50 /mortality) and chronic (locomotion, development, regeneration, and reproduction) effects. The degradation of CRZ by the AOPs process was also studied by theoretical studies. The degradation percentages were more than 70%. 48h LC 50 of CRZ and CRZ+photo-Fenton (pH 3 and 7), was 478.6, 15.91, and 2072 mg.L -1 of TMX, respectively. The sublethal effects showed significance only for regeneration. The treatment proved positive for degradation but needs to have the pH corrected to reduce the effects on G. tigrina.

Keywords: Neonicotinoid, Platyhelminthes, UV photo-Fenton process, Theoretical degradation

Suggested Citation

Barbosa, Rone da Silva and Cavallini, Grasiele Soares and Cruz, Állefe Barbosa and Pereira, Douglas Henrique and de Souza, Nelson Luis Gonçalves Dias and Carlos, Thayrine Dias and Soares, Amadeu M.V.M. and Gravato, Carlos and Sarmento, Renato Almeida, Degradation of the Neonicotinoid Thiamethoxam by the Solar-Fenton Process: Theoretical Insights and Ecotoxicological Evaluation. Available at SSRN: https://ssrn.com/abstract=4193674 or http://dx.doi.org/10.2139/ssrn.4193674

Rone da Silva Barbosa

affiliation not provided to SSRN ( email )

No Address Available

Grasiele Soares Cavallini

affiliation not provided to SSRN ( email )

No Address Available

Állefe Barbosa Cruz

affiliation not provided to SSRN ( email )

No Address Available

Douglas Henrique Pereira

affiliation not provided to SSRN ( email )

No Address Available

Nelson Luis Gonçalves Dias De Souza

affiliation not provided to SSRN ( email )

No Address Available

Thayrine Dias Carlos

affiliation not provided to SSRN ( email )

No Address Available

Amadeu M.V.M. Soares

Universidade de Aveiro - Department of Biology ( email )

Carlos Gravato

University of Lisbon - Centre for Environmental and Marine Studies (CESAM) ( email )

Campo Grande
Portugal

Renato Almeida Sarmento (Contact Author)

affiliation not provided to SSRN ( email )

No Address Available

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