Identification, Elucidation, and Toxicity Assessment of Nontarget Disinfection By-products from Fipronil Chlorination

In the present study, fipronil degradation was evaluated in typical chlorination conditions (fipronil: 20 μg L −1 ; free chlorine concentration: 2 mg L −1 ; pH 7.5; 25 ○ C). Fipronil was quickly degraded by chlorination with half-time life of 2.08 min, achieving 95% of degradation in 15 min of react...

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Veröffentlicht in:Water, air, and soil pollution air, and soil pollution, 2021-04, Vol.232 (4), Article 156
Hauptverfasser: de Barros, André Luis Corrêa, da Silva Rodrigues, Daniel Aparecido, da Cunha, Camila Cristina Rodrigues Ferreira, Silva, Silvana de Queiroz, Afonso, Robson José de Cássia Franco
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container_title Water, air, and soil pollution
container_volume 232
creator de Barros, André Luis Corrêa
da Silva Rodrigues, Daniel Aparecido
da Cunha, Camila Cristina Rodrigues Ferreira
Silva, Silvana de Queiroz
Afonso, Robson José de Cássia Franco
description In the present study, fipronil degradation was evaluated in typical chlorination conditions (fipronil: 20 μg L −1 ; free chlorine concentration: 2 mg L −1 ; pH 7.5; 25 ○ C). Fipronil was quickly degraded by chlorination with half-time life of 2.08 min, achieving 95% of degradation in 15 min of reaction. For identification and elucidation of its disinfection by-products, fipronil solutions (2.0 mg L −1 ) were chlorinated at different contact times. Six by-products were identified and their structural formulas were elucidated by high-resolution mass spectrometry. Lastly, the toxicity of the unreacted and chlorinated solutions was evaluated using in vitro, in vivo, and in silico assays. Unreacted and chlorinated solutions were toxic to Artemia salina nauplii with an increase on toxic effects after 24 h of reaction time. No estrogenicity and cytotoxicity were observed for the tested solutions using re-engineered bioluminescent yeast estrogen screen and colorimetric MTT assays, respectively. According to quantitative structure-activity relationship methodology, chlorination may produce a more mutagenic compound than the precursor fipronil. The generated disinfection by-products also proved to be developmental toxicant, although it was not possible to measure their relative potency in relation to the parent compound.
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Fipronil was quickly degraded by chlorination with half-time life of 2.08 min, achieving 95% of degradation in 15 min of reaction. For identification and elucidation of its disinfection by-products, fipronil solutions (2.0 mg L −1 ) were chlorinated at different contact times. Six by-products were identified and their structural formulas were elucidated by high-resolution mass spectrometry. Lastly, the toxicity of the unreacted and chlorinated solutions was evaluated using in vitro, in vivo, and in silico assays. Unreacted and chlorinated solutions were toxic to Artemia salina nauplii with an increase on toxic effects after 24 h of reaction time. No estrogenicity and cytotoxicity were observed for the tested solutions using re-engineered bioluminescent yeast estrogen screen and colorimetric MTT assays, respectively. According to quantitative structure-activity relationship methodology, chlorination may produce a more mutagenic compound than the precursor fipronil. 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subjects Aquatic crustaceans
Artemia
Atmospheric Protection/Air Quality Control/Air Pollution
Biocompatibility
Bioluminescence
By products
Byproducts
Chlorination
Chlorine
Climate Change/Climate Change Impacts
Colorimetry
Cytotoxicity
Degradation
Disinfection
Earth and Environmental Science
Environment
Environmental monitoring
Estrogens
Evaluation
Fipronil
Hydrogeology
Identification
Infection control
Insecticides
Mass spectrometry
Mass spectroscopy
Nauplii
Oestrogens
Pesticides
Reaction time
Reengineering
Sex hormones
Soil Science & Conservation
Toxicants
Toxicity
Water Quality/Water Pollution
Yeasts
title Identification, Elucidation, and Toxicity Assessment of Nontarget Disinfection By-products from Fipronil Chlorination
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