Insight into Imidacloprid Degradation through Compound Specific Carbon Isotope Analysis and High-Resolution Mass Spectrometry DOI
Felix Niemann,

Annika Gruhlke,

Klaus Kerpen

et al.

ACS ES&T Water, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 6, 2024

The insecticide imidacloprid (IMI) is an ubiquitous environmental contaminant. This study presents approach to investigate its degradation through the combined use of compound-specific stable carbon isotope analysis and high-resolution mass spectrometry (HRMS). It demonstrates how ratio HRMS product can complement each other. photolysis by simulated sunlight, UV–C (λ = 254 nm), alkaline hydrolysis all exhibited distinguishable enrichment factors (εC). largest fractionation observed during at pH 12 30 °C (εC −3.9 ± 0.4‰). confirms that only one atom in a reactive position, allowing AKIE calculation −34.1 3.7‰). Carbon were not significantly affected dissolved oxygen content or pH. Irradiation did result significant enrichment, whereas experiments with sunlight yielded εC values between −1.1 0.1 −1.4 0.1‰. was hypothesized increased contribution indirect led isotopic enrichment. Finally, we demonstrate developed method be used determine fingerprint veterinary flea control products.

Language: Английский

Fate and degradation of methoxychlor in a contaminated aquifer: insights from dual carbon-chlorine isotope analysis and isomeric fraction DOI

Martí Vinyes-Nadal,

Sergio Gil-Villalba, Mònica Rosell

et al.

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 488, P. 137447 - 137447

Published: Jan. 29, 2025

Language: Английский

Citations

0
Role of membrane porosity in passive sampling of aquatic contaminants for stable isotope analysis: enhancement of analyte accumulation rates and selectivity DOI Creative Commons

Armela Tafa,

Anat Bernstein, Martin Elsner

et al.

Analytical and Bioanalytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 31, 2025

Abstract Compound-specific isotope analysis (CSIA) is a potent method for illustrating the in situ degradation of aquatic contaminants. However, its application to surface and groundwater hindered by low contaminant concentrations, typically nanogram-per-litre range, requiring processing large water volumes. Polar organic chemical integrative samplers (POCIS) have shown promising results when combined with CSIA, yet their extended deployment time accumulate sufficient analyte mass remains major limitation. In our study, we addressed this issue increasing pore size polyethersulfone membrane (PES) from 0.1 8 $$\upmu $$ μ m. This resulted significant increases accumulation rates atrazine (3.5-fold), S-metolachlor (3.4-fold), boscalid (3.0-fold). Importantly, larger sizes did not compromise isotopic integrity, $$\Delta \delta ^{13}$$ Δ δ 13 C $$\le +0.4\pm 0.1$$ ≤ + 0.4 ± 0.1 ‰ ^{15}$$ 15 N -0.6\pm 0.4$$ - 0.6 ‰, both within accepted uncertainties. Additionally, observed an enhanced selectivity pores towards target analytes over humic acids, whereas no increase (bio)fouling potential was detected m membrane, as demonstrated gravimetric analysis, SEM measurements, rates, ratios fouled unfouled POCIS. Our findings show that reduces expedites required gas chromatography ratio spectrometry, offering expand CSIA low-concentration pesticide field. Graphical abstract

Language: Английский

Citations

0
Insight into Imidacloprid Degradation through Compound Specific Carbon Isotope Analysis and High-Resolution Mass Spectrometry DOI
Felix Niemann,

Annika Gruhlke,

Klaus Kerpen

et al.

ACS ES&T Water, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 6, 2024

The insecticide imidacloprid (IMI) is an ubiquitous environmental contaminant. This study presents approach to investigate its degradation through the combined use of compound-specific stable carbon isotope analysis and high-resolution mass spectrometry (HRMS). It demonstrates how ratio HRMS product can complement each other. photolysis by simulated sunlight, UV–C (λ = 254 nm), alkaline hydrolysis all exhibited distinguishable enrichment factors (εC). largest fractionation observed during at pH 12 30 °C (εC −3.9 ± 0.4‰). confirms that only one atom in a reactive position, allowing AKIE calculation −34.1 3.7‰). Carbon were not significantly affected dissolved oxygen content or pH. Irradiation did result significant enrichment, whereas experiments with sunlight yielded εC values between −1.1 0.1 −1.4 0.1‰. was hypothesized increased contribution indirect led isotopic enrichment. Finally, we demonstrate developed method be used determine fingerprint veterinary flea control products.

Language: Английский

Citations

0