Dispersive liquid–liquid microextraction as a novel enrichment approach for compound-specific carbon isotope analysis of chlorinated phenols

Analytical Methods, Год журнала: 2024, Номер 16(6), С. 919 - 929

Опубликована: Янв. 1, 2024

Dispersive liquid–liquid microextraction (DLLME) is a promising approach to enrich (semi-)volatile organics from aqueous samples prior compound-specific stable isotope analysis (CSIA) by gas chromatography-isotope ratio mass spectrometry (GC-IRMS).

Язык: Английский

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Compound specific isotope analysis in hydrogeology

Journal of Hydrology, Год журнала: 2022, Номер 615, С. 128588 - 128588

Опубликована: Окт. 31, 2022

Язык: Английский

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Effects of Thiamethoxam and Fenvalerate Residue Levels on Light-Stable Isotopes of Leafy Vegetables

Foods, Год журнала: 2023, Номер 12(14), С. 2655 - 2655

Опубликована: Июль 10, 2023

Accurate identification of the rational and standardized use pesticides is important for sustainable development agriculture while maintaining a high quality. The insecticides thiamethoxam fenvalerate vegetables spinach, cabbage, lettuce were used here as study objects. Descriptive analysis primary reaction kinetic equations to analyze changes in metabolic residues two after different numbers application three vegetables. effects pesticide residue levels on δ13C, δ15N, δ2H, δ18O values analyzed by one-way variance correlation analysis. Partial least squares discriminant (PLS-DA) was applied build discrimination models with based stable isotopes. results showed that first degradation conformed equations, but half-lives long, accumulation occurred second application. differences four isotope ratios control group statistically significant, two-thirds applications significantly different. δ13C δ15N δ2H correlated and/or applications. groups vegetables, spinach-thiamethoxam-first, spinach-thiamethoxam-second, cabbage-thiamethoxam-second, cabbage-fenvalerate-first, lettuce-thiamethoxam-first, fully identified PLS-DA models, other containing still need be further improved. provide technical support identifying reference method guaranteeing authenticity green organic

Язык: Английский

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Compound-Specific Isotope Analyses to Investigate Pesticide Transformation in Soil and Water

Опубликована: Янв. 1, 2024

Abstract This chapter provides an overview of approaches employed in tracking pesticide degradation within agricultural catchments, focusing on the existing challenges and burgeonic prospects afforded by compound-specific isotope analyses (CSIA). The discussion centers development CSIA for low concentrations pesticides environmental matrices. Additionally, explores viability implementing field applications tasks such as source apportionment, discerning transformation reactions, quantifying extent a catchment scale.

Язык: Английский

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Reducing baseline toxicity in fishery product-related sediments from land to sea: Region-specific solutions are required

The Science of The Total Environment, Год журнала: 2024, Номер 946, С. 174024 - 174024

Опубликована: Июнь 19, 2024

Язык: Английский

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Compatibility of Polar Organic Chemical Integrative Sampler (Pocis) with Compound Specific Isotope Analysis (Csia) of Substituted Chlorobenzenes

Опубликована: Янв. 1, 2023

Compound specific isotope analysis (CSIA) is a powerful technique to demonstrate in situ degradation of traditional groundwater contaminants when concentrations are typically the mg/L range. Currently, an efficient preconcentration method lacking expand CSIA low aqueous concentration environmental samples. Specially for H- and N-CSIA heteroatom-bearing non-traditional compounds, analytical detection limits significantly higher than that C-CSIA. This work demonstrated compatibility polar organic chemical integrative sampler (POCIS) with C-, H-, using four nitro- amino-substituted chlorobenzenes common industrial feedstock numerous applications commonly detected environment at µg/L Using lab experiments, we showed isotopic equilibrium POCIS was achieved after 30 days either negligible (<0.5‰) or reproducible shift C (<1‰) N (<2‰). Similar (<5‰) (<20‰) evident H except 3,4-dichloroaniline. The quantification combined sorbent membrane one were comparable solid phase extraction (SPE) 10 L water. Next, field applicability C- 60-day deployment pilot constructed wetland by showing <1‰ difference between δ13C δ15N obtained from SPE. Finally, evaluated whether biofilm development on could affect signature sampled compounds during deployment. Although diverse microbial community identified deployment, did not observe significant fractionation due increased diffusion barrier compounds. demonstrates potential POCIS-CSIA as simple, fast, sensitive low-concentration contaminants, such pesticides, pharmaceuticals, flame-retardants.

Язык: Английский

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Pesticide Residues Impact on Drinking Water and Farmers Using Environmental Health Risk Assessment Study (EHRA)

Media Kesehatan Masyarakat Indonesia, Год журнала: 2023, Номер 19(2), С. 93 - 102

Опубликована: Июнь 30, 2023

Public health problems and decreased environmental can be caused by pesticides because they are dangerous toxic substances. Pesticides have had a risky impact on farmers in Jonggol village. Assessing the risk of pesticide exposure to drinking water sources agricultural areas village 2022 is aim this study. The research used Environmental Health Risk Assessment Conducting interviews with questionnaires, measuring sources, observing part data collection. results conducted at 3 points only found first point, namely well Kampung Kujang value above standard 0.0855 mg/l location 2 m from agriculture. In next two points, Karni river Bengkok village, no were detected distance agriculture was 20 m. Most wells consumed for drinking. calculation result 0.00246 mg/kg/day non-carcinogenic intake values (real-time) 0.001056 carcinogenic (real-time). showed there RQ ≤ 1 characteristics 0.246. conclusion that both real-time lifetime, already risk. reduced importance protecting carrying out management.

Язык: Английский

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Quel est le rôle des retenues collinaires pour limiter les flux de pesticides dans le paysage agricole ?

Sciences Eaux & Territoires, Год журнала: 2023, Номер 43, С. 49 - 56

Опубликована: Окт. 9, 2023

Les systèmes aquatiques tels que les mares, zones humides, bassins d’orage, retenues collinaires, ci-après nommées « d’eau », sont des de rétention d'eau omniprésents dans versants agricoles. Ces opèrent comme réacteurs biogéochimiques naturels, contrôlant la dissipation et le transfert contaminants agricoles, dont pesticides, à l'échelle du bassin versant. De façon complémentaire aux mesures pratiques réduction voire d’élimination l’utilisation pesticides synthèse, projet PESTIPOND (2018-2023), financé par l’Agence nationale recherche (ANR), s’est intéressé au rôle transferts résultats principaux présentés cet article. a permis mieux comprendre, hiérarchiser prédire processus qui conditionnent comment régit versant conditions hydro-climatiques d'exploitation agricole variables. Pour intégrer aspects multi-échelles dynamiques cette problématique, un cadre modélisation tenant compte est proposé pour améliorer prédiction l'évaluation risques vers écosystèmes aquatiques.

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