High-resolution characterization technology for micro-/nano-plastics

Journal of Physics D Applied Physics, Год журнала: 2024, Номер 57(22), С. 223001 - 223001

Опубликована: Фев. 22, 2024

Abstract Microplastics (MPs) are plastic residues with a size <5 mm, which often further broken into micro/nano particles in the environment. Owing to their minute scale, widespread distribution, and substantial toxicity potential, MPs has emerged as critical environmental concern. Therefore, accurate characterization of these becomes formidable yet imperative challenge science. In this review, comprehensive overview on current MP techniques, including microscopy/electron microscopy, spectroscopy, mass spectrometry, have been summarized discussed. We assess applicability, strengths, limitations, well recent advancements. also highlight features offered by different techniques range for each technique is suitable. Furthermore, combination some novel that can be used mentioned. This work offers reference characterization, will facilitate detection

Язык: Английский

---

Study on Absorption, Distribution, Metabolism, and Excretion Properties of Novel Insecticidal GABA Receptor Antagonist, Pyraquinil, in Diamondback Moth Combining MALDI Mass Spectrometry Imaging and High-Resolution Mass Spectrometry

Journal of Agricultural and Food Chemistry, Год журнала: 2022, Номер 70(20), С. 6072 - 6083

Опубликована: Май 16, 2022

A thorough understanding of absorption, distribution, metabolism, and excretion (ADME) insecticide candidates is essential in development structural optimization. Here, ADME pyraquinil, a novel insecticidal GABA receptor antagonist, Plutella xylostella larvae during the accumulation phase depuration was investigated separately using combination UHPLC-Q-Orbitrap, HPLC-MS/MS, MALDI-MSI. Five new metabolites pyraquinil were identified, metabolic pathway proposed. The oxidative metabolite (pyraquinil-sulfone) identified as main confirmed by its standard. Quantitative results showed that taken up rapidly then undergone cytochrome P450s-mediated transformation into pyraquinil-sulfone. Both fecal metabolism demonstrated to be predominant ways eliminate P. accumulation, while followed probably major depuration. MALDI-MSI revealed homogeneously distributed larvae, pyraquinil-sulfone presented continuous enrichment midgut accumulation. Conversely, located hemolymph can preferentially eliminated depuration, suggesting tissue tropism. It improves fate provides useful information for mechanism elucidation optimization pyraquinil.

Язык: Английский

---

Quantitative imaging approaches to understanding biological processing of metal ions

Current Opinion in Chemical Biology, Год журнала: 2022, Номер 69, С. 102152 - 102152

Опубликована: Май 10, 2022

Язык: Английский

---

One-point calibration and matrix-matching concept for quantification of potentially toxic elements in wood by LA-ICP-MS

Analytical and Bioanalytical Chemistry, Год журнала: 2023, Номер 416(11), С. 2737 - 2748

Опубликована: Ноя. 4, 2023

Язык: Английский

---

Environmental fate and transformation of TiO₂ nanoparticles: A comprehensive assessment

Alexandria Engineering Journal, Год журнала: 2024, Номер 115, С. 264 - 276

Опубликована: Дек. 19, 2024

Язык: Английский

---

Detection of Microplastic Contamination in Commercial Insect Meals

Environments, Год журнала: 2024, Номер 11(6), С. 112 - 112

Опубликована: Май 27, 2024

Background: Escalating global plastic production, expected to reach 34,000 million tons by 2050, poses a significant threat human and environmental well-being, particularly in aquatic ecosystems. Microplastics (MP) nanoplastics (NP), which originate from the degradation of plastics, are concern due their potential bioaccumulation uptake pollutants. This study addresses identification methods focuses on insect meal, raw material for aquaculture feed. Methods: By using different techniques, was able detect MP NP meal samples. Chemical digestion with KOH at 60 °C efficiently removed organic matter without affecting synthetic polymer polyethylene (PE). Filtration, confocal Raman microscopy, SEM, TEM were used comprehensive analysis, integrity tests PE films performed FTIR spectroscopy. The results showed presence microplastic particles confirmed correlative SEM mapping positively charged surface. In addition, increased resolution microscope identified submicrometric (800 nm). Transmission electron microscopy (TEM) energy-dispersive X-ray spectroscopy (EDX) plastic-like structures highlighting plastics characterized irregular shapes some agglomeration. higher carbon concentration EDX analysis supported nature, also Conclusions: provides robust method detection valuable insight into possible insect-based aquafeeds. combination analytical increases reliability sets stage future investigations that could focus quantification assessment impact.

Язык: Английский

---

Water Oxidation Performance Enhanced by Electrochemically Designed Vacancies on a Prussian Blue Catalyst

ACS Applied Energy Materials, Год журнала: 2022, Номер 5(8), С. 9447 - 9454

Опубликована: Июль 20, 2022

Prussian blue analogues are one of the most promising examples water oxidation catalysts presenting great performance, activity, and stability under mild conditions. Herein, we report an alternative methodology to synthesize blue, obtaining a catalyst with vacancies created by electrochemical method. This showed outstanding onset overpotential 361 mV. Using pyridine as molecular probe, identified presence vacant Fe2+ sites, quantification these sites allowed us estimate TOF number 0.2170 s–1 for reaction. These results indicate that defect engineering is versatile strategy boost catalytic activity in increasing active sites.

Язык: Английский

---

Ambient Ionization Mass Spectrometry: Applications and New Trends for Environmental Matrices Analysis

Brazilian Journal of Analytical Chemistry, Год журнала: 2022, Номер unknown

Опубликована: Апрель 7, 2022

Since its introduction, ambient mass spectrometry methods have been demonstrated as potential approaches for a rapid and sensitive analysis of many compounds in complex matrices with minimum or no sample preparation step performed. Some these include low-cost devices situ methodologies that are included the new trend green analytical chemistry. The application environmental has reported last decades qualitative quantitative analysis. This study aims to contribute an overview 2016 2021 period applications In this context, review reports especially contaminants using desorption electrospray ionization (DESI), direct real-time (DART), paper spray (PSI), extractive (EESI) methods.

Язык: Английский

---

Bioimaging of uranium and thorium in mice organs by laser ablation inductively coupled plasma mass spectrometry

Journal of Radioanalytical and Nuclear Chemistry, Год журнала: 2023, Номер 332(7), С. 2559 - 2569

Опубликована: Май 26, 2023

Язык: Английский

---

Wind turbine contaminant classification using machine learning techniques

Spectrochimica Acta Part B Atomic Spectroscopy, Год журнала: 2023, Номер 210, С. 106802 - 106802

Опубликована: Окт. 9, 2023

It has been well established in the literature that surface contamination can adversely affect aerodynamic performance of aerofoils and hence efficiency with which turbines convert wind to electrical power. Hence it is critical ensure turbine blades are kept as free possible contaminants. In this manuscript, we discuss LIBS machine learning techniques on contaminated a view possibility integrating these methods into standoff laser ablation setup future. A signal will be key step decision process, i.e., determine if blade fouled first place. Relatedly one must also point at adequately removed contaminants from current Area Irradiation (AoI) before moving adjacent AoI, interim end-point-detection. For both steps (presence / absence fouling) investigating laser-induced breakdown spectroscopy (LIBS) discriminate clean samples. particular have performed Vacuum Ultraviolet (VUV) Visible (UV–Vis) spectral ranges. Analysis spectra showed only slight variations constituent materials between order address challenge, efficacy number statistical for versus classification was investigated. Four (Partial Least Squares Discriminant (PLS-DA), Support Vector Machines (SVM), Competitive Learning (CL), Convolutional Neural Networks (CNN)) were evaluated. The regions where algorithms applied determined via volumetric ellipsoid overlap test based Principal Component (PCA). found SVMs provided most accurate methodology binary vs whilst yielding shortest run time.

Язык: Английский

---