Surface-water exposure to quinoxyfen: Assessment in landscape vineyards

Merli, Annalisa; Reeves, Graham; Meregalli, Giovanna; Piccinini, Armando; Negri, Ilaria; Carmignano, Pasquale; Balderacchi, Matteo; Capri, E.

doi:10.1016/j.jhydrol.2009.11.035

Cited by 4 publications

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hildebrandt et al (2008) detected metalaxyl in both ground water (8 to 18% of samples; maximum concentration 0.25 to 0.36 μg/L) and surface water (4 to 14% of samples; maximum concentration 0.01 to 0.04 μg/L) in a catchment dominated by horticultural production. Little consideration has been given to assessing spray drift as a source of off-site fungicide movement, although Merli et al (2010) found that despite up to 11 applications of quinoxyfen, very little of this fungicide was detected in sediments of a nearby surface ditch. Similarly in a study of pesticides in irrigation supply channels in a horticultural region in Australia, chlorothalonil, the only fungicide tested for, wasn't detected, despite spray drift being identified as a main source of local surface water contamination (Rose & Kibria, 2007).…”

Section: Transport Of Fungicides From Horticultural Production Systemsmentioning

confidence: 99%

Environmental Risks of Fungicides Used in Horticultural Production Systems

Wightwick¹,

Walters²,

Allinson³

et al. 2010

Fungicides

119

View full text Add to dashboard Cite

Section: Transport Of Fungicides From Horticultural Production Systemsmentioning

confidence: 99%

Environmental Risks of Fungicides Used in Horticultural Production Systems

Wightwick¹,

Walters²,

Allinson³

et al. 2010

Fungicides

119

View full text Add to dashboard Cite

Assessment of quinoxyfen phototransformation pathways by liquid chromatography coupled to accurate mass spectrometry

et al. 2017

View full text Add to dashboard Cite

Quinoxyfen has been recently identified as a priority hazardous substance in the field of the European water policy. In this work, its fate in aqueous samples and solid supports under UV and solar radiation is investigated. Diverse degradation experiments were carried out, at lab scale, using spiked aliquots of different aqueous matrices (ultrapure, treated wastewater and river water) irradiated at different wavelengths (λ = 254 nm, λ = 365 nm and solar light). Half-lives of quinoxyfen (2-26 min) depended on the wavelength and the intensity of radiation whilst the nature of the aqueous matrix did not play an important role in degradation kinetics. Moreover, experiments under solar radiation of doped silicone tubes were performed to simulate degradation when quinoxyfen is adsorbed on plant leaves or soil. As the compound is not completely mineralized, the identification of quinoxyfen transformation products (TPs) was performed by liquid chromatography quadrupole time-of-flight mass spectrometry (LC-QTOF-MS) injection of different irradiated time aliquots. The full-fragment ion spectra, at different collision energies, allowed the elucidation of the chemical structure of TPs formed by hydroxylation, cyclization or cleavage reactions. Five out of seven identified TPs have not been reported previously. The ecotoxicity simulation by software (TEST and ECOSAR) for TPs revealed that some of them could cause harmful effects to organisms such as Daphnia magna or Fathead minnow in a similar extent to the precursor; moreover, the time course profiles of major TPs (TP1 and TP2) revealed a much higher resistance to further photodegradation than quinoxyfen. Graphical abstract Quinoxyfen phototransformation pathways.

show abstract

Immunochemical rapid determination of quinoxyfen, a priority hazardous pollutant

et al. 2018

View full text Add to dashboard Cite

In 2013, quinoxyfen was included in the list of priority hazard pollutants of the European Water Framework Directive due to its toxicity to aquatic organisms. However, few analytical methods for the analysis of this fungicide have been reported and no rapid immunochemical methods have been published so far. In the present study, immunoreagents for quinoxyfen analysis were generated for the first time and an enzyme-linked immunosorbent assay was developed. Two carboxylated derivatives of quinoxyfen were designed on the basis of the minimum energy conformation of the target compound. Active esters of those novel compounds were prepared using N,N'-disuccinimidyl carbonate, and purified for covalent coupling to proteins. Matrix-assisted laser desorption mass spectrometry of the prepared bioconjugates showed optimum hapten-to-protein molar ratios. Moreover, high-affinity antibodies specific of quinoxyfen were raised. As proof of concept, an immunoassay was evaluated using a heterologous conjugate, which afforded sensitivity values in the low nanomolar range. Moreover, excellent recoveries and coefficients of variation were obtained from the analysis of environmental water samples fortified with quinoxyfen. A limit of quantification of 60 μg/L was determined. The prepared bioconjugates and antibodies could be valuable immunoreagents for the development of a variety of rapid immunosensors for quinoxyfen determination in environmental samples.

show abstract

Surface-water exposure to quinoxyfen: Assessment in landscape vineyards

Cited by 4 publications

References 9 publications

Environmental Risks of Fungicides Used in Horticultural Production Systems

Environmental Risks of Fungicides Used in Horticultural Production Systems

Assessment of quinoxyfen phototransformation pathways by liquid chromatography coupled to accurate mass spectrometry

Immunochemical rapid determination of quinoxyfen, a priority hazardous pollutant

Contact Info

Product

Resources

About