Electroanalytical studies of the pesticides menazon and its hydrolysis products

The photochemical degradation of metamitron (4-amino-4,5-dihydro-3-methyl-6-phenyl-1,2,4-triazin-5-one) and imidacloprid (1-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylideneamine) has been investigated by differential-pulse polarography (DPP) and micellar electrokinetic chromatography (MEKC); the degradation pathways of these pesticides were elucidated and their degradation products proposed.The electrochemical study of imidacloprid by DPP at different pH values demonstrated the occurrence of two different reduction processes; at pH 6.8, two peaks at À0.90 V and À1.38 V, respectively, were obtained, which are related to the photochemical reduction processes. The photochemical degradation of imidacloprid caused by sunlight was polarographically monitored and its degradation products elucidated. The polarographic reduction of deaminometamitron (obtained by photochemical reduction of metamitron) yielded two peaks at À0.62 and À1.37 V, which are related to the reduction of the C=N bonds. The effect of sunlight on the reduction of metamitron was monitored by DPP, and an increase of the concentration of the degradation products was observed with time.MEKC with UV-visible detection was used to separate the pesticides and the products of their photochemical degradation, which were identi®ed in combination with DPP.

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Monitoring of the photochemical degradation of metamitron and imidacloprid by micellar electrokinetic chromatography and differential‐pulse polarography

Cacho

Fierro

Debán

et al. 1999

Pestic. Sci.

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show abstract

Monitoring of the photochemical degradation of metamitron and imidacloprid by micellar electrokinetic chromatography and differentialpulse polarography

Cacho¹,

Fierro²,

Debán³

et al. 1999

Pestic. Sci.

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Electrochemical investigations of reactive dyes; polarographic determination of anthraquinone-based chlorotriazine dyes

Zanoni

Fogg

Barek

et al. 1995

Analytica Chimica Acta

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Electroanalytical studies of the pesticides menazon and its hydrolysis products

Cited by 9 publications

References 9 publications

Monitoring of the photochemical degradation of metamitron and imidacloprid by micellar electrokinetic chromatography and differential‐pulse polarography

Monitoring of the photochemical degradation of metamitron and imidacloprid by micellar electrokinetic chromatography and differential‐pulse polarography

Monitoring of the photochemical degradation of metamitron and imidacloprid by micellar electrokinetic chromatography and differentialpulse polarography

Electrochemical investigations of reactive dyes; polarographic determination of anthraquinone-based chlorotriazine dyes

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