The first study of triazole fungicide difenoconazole oxidation and its voltammetric and flow amperometric detection on boron doped diamond electrode

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F21%3A00542194" target="_blank" >RIV/61388955:_____/21:00542194 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/21:10435843 RIV/00216275:25310/21:39917753

Výsledek na webu

<a href="http://hdl.handle.net/11104/0319670" target="_blank" >http://hdl.handle.net/11104/0319670</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.electacta.2021.138260" target="_blank" >10.1016/j.electacta.2021.138260</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The first study of triazole fungicide difenoconazole oxidation and its voltammetric and flow amperometric detection on boron doped diamond electrode

Popis výsledku v původním jazyce

Triazole pesticides act as sterol synthesis inhibitors and have been considered as redox-inactive with a variety of electrode materials. In this study, electrochemical oxidation of the fungicide difenoconazole (DFC) was studied in aqueous solutions on oxygen terminated boron doped diamond electrode. It provided a pH-independent irreversible anodic peak at a very positive potential of ca +1.75 V (vs. Ag/AgCl) in acidic media, which could be used for its quantitation in batch voltammetry and flow injection analysis with amperometric detection. The attained detection limits for the determination of DFC in 0.1 mol L HNO / phosphate buffer pH 2.0 were 0.049 μmol L for differential pulse voltammetry and 1.58 μmol L for FIA-ED. The former method did not suffer from any significant matrix interferences or interferences of other fungicides and yielded acceptable percentage recovery values (ranging from 96% to 107%) for DFC determination in model river water samples. Similar results comparing both methods at a 95% confidence level were obtained for DFC determination in pesticide preparations. Further, an oxidation mechanism leading to hydroxylated derivative of DFC and subsequent formation of a quinone was suggested. Results were supported with HOMO spatial distribution calculations and atomic charges calculations for arising radical cations.

Název v anglickém jazyce

The first study of triazole fungicide difenoconazole oxidation and its voltammetric and flow amperometric detection on boron doped diamond electrode

Popis výsledku anglicky

Triazole pesticides act as sterol synthesis inhibitors and have been considered as redox-inactive with a variety of electrode materials. In this study, electrochemical oxidation of the fungicide difenoconazole (DFC) was studied in aqueous solutions on oxygen terminated boron doped diamond electrode. It provided a pH-independent irreversible anodic peak at a very positive potential of ca +1.75 V (vs. Ag/AgCl) in acidic media, which could be used for its quantitation in batch voltammetry and flow injection analysis with amperometric detection. The attained detection limits for the determination of DFC in 0.1 mol L HNO / phosphate buffer pH 2.0 were 0.049 μmol L for differential pulse voltammetry and 1.58 μmol L for FIA-ED. The former method did not suffer from any significant matrix interferences or interferences of other fungicides and yielded acceptable percentage recovery values (ranging from 96% to 107%) for DFC determination in model river water samples. Similar results comparing both methods at a 95% confidence level were obtained for DFC determination in pesticide preparations. Further, an oxidation mechanism leading to hydroxylated derivative of DFC and subsequent formation of a quinone was suggested. Results were supported with HOMO spatial distribution calculations and atomic charges calculations for arising radical cations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GA18-01710S" target="_blank" >GA18-01710S: Skupinové interakce azolových pesticidů a jejich efekt na esenciální enzymy</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Electrochimica acta

ISSN

0013-4686

e-ISSN

1873-3859

Svazek periodika

381

Číslo periodika v rámci svazku

JUN 2021

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

138260

Kód UT WoS článku

000641341500012

EID výsledku v databázi Scopus

2-s2.0-85103950027