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Carbon Mass - Europe PMC

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Last Updated: 10 January 2023

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Molecular Composition of Beijing PM 2.5 Brown Carbon Revealed by an Untargeted Approach Based on Gas Chromatography and Time-of-Flight Mass Spectrometry.

Brown carbon's chemical composition is limited to the identification of constituents or portions of specific organic compounds. During heating seasons, the absorption contribution of 365 nm of quantified BrC species to lipid-soluble BrC was 39. 1 %, which was around 5 times as high as previous estimates. These findings assist in the establishment of a comprehensive BrC molecular database and aid in accurately determining the climate effects of atmospheric carbonaceous aerosols and designing air pollution control policies.

Source link: https://europepmc.org/article/MED/36594719


An online derivatization strategy targeting carbon-carbon double bonds by laser-ablation carbon fiber ionization mass spectrometry imaging: Unraveling the spatial characteristic in mountain-cultivated ginseng and garden-cultivated ginseng with different ages.

These metabolites' detailed analysis can help determine ginseng's nutritional value. A high-throughput, high-selectivity internet derivatization mass spectrometry imaging scheme aimed at CC was devised herein. CC, a long-established chemical group, acts as a bridge between various types of metabolites. [d 0 ]/[d 10]-Bis tetrafluoroboride reagent was chosen for the derivatization of CC, owing to the detection sensitivity, which increased about 3 magnitudes after derivatization. metabolites in mountain-cultivated ginseng had a higher correlation than those in garden-cultivated ginseng, according to the correlation heatmap results.

Source link: https://europepmc.org/article/MED/36608558


Effects of High-Quality Carbon Nanowalls Ionization-Assisting Substrates on Surface-Assisted Laser Desorption/Ionization Mass Spectrometry Performance

The CNWs were somewhat different in terms of crystallinity and Cu2013OH groups, with similar wall-to-wall distances and a wettability similar to CNWs grown without O2. Using N-benzylpyridinuim chloride, the effectiveness of SALDI was tested on both parameters of ion intensity and fragmentation effectiveness. Normal CNWs had an SY of 0. 97 and an ion intensity of 0. 13, as well as a 5-scm-O2u2013 high-quality CNWs had an SY of 0. 89 and an ion intensity of 2. 55. The SALDI-MS tests, which were available with the high-quality CNWs ionization-assist substrate, showed good ionization and SY values.

Source link: https://europepmc.org/article/MED/PMC9823508


Effects of High-Quality Carbon Nanowalls Ionization-Assisting Substrates on Surface-Assisted Laser Desorption/Ionization Mass Spectrometry Performance.

The CNWs in the current study were grown using a radical-injection plasma-enhanced chemical vapor deposition process with the addition of oxygen in a mixture of CH 4 and H 2 gases. The CNWs were distinctly different from crystallinity and C-OH groups, with some displaying similar wall-to-wall distances and a wettability similar to CNWs grown without O 2. Normal CNWs had an SY of 0. 97 and an ion intensity of 0. 13 at 4 mJ/cm 2, and 5-scm-O 2 - high-quality CNWs had an SY of 0. 89 and a ion intensity of 2. 55.

Source link: https://europepmc.org/article/MED/36615973


On-site Simultaneous Determination of Neonicotinoids, Carbamates, and Phenyl Pyrazole Insecticides in Vegetables by QuEChERS Extraction on Nitrogen and Sulfur co-doped Carbon Dots and Portable Mass Spectrometry.

On-site and simultaneous detection of a variety of insecticides with different concentrations in the same matrix is often required in food safety testing. In this research, a novel nitrogen and sulfur co-doped carbon dot was synthesized and used as a QuEChERS clean-up agent to eliminate matrix interferences in vegetable determination. Between -15. 2% and 15. 7%, the N,S-CD u00b5-MS method produced good clean-up results with positive matrix effects between -15. 2% and 15. 7%. Spiked vegetable samples recovered from 82. 2% to 109. 7% for the five target insecticides, with relative standard deviations ranging from 3. 8 percent to 16. 5%.

Source link: https://europepmc.org/article/MED/36610187


Study on ethanol electro-oxidation over a carbon-supported Pt-Cu alloy catalyst by pinhole on-line electrochemical mass spectrometry.

The results of potentiodynamic and potentiostatic experiments revealed that the Pt-Cu/C electrocatalyst has higher ethanol oxidation capacity and incomplete oxidation of acetaldehyde and acetic acid under the following conditions. The resulting CO2 current efficiencies on Pt/C and PtCu-12% were u223c7% and u223c12%, respectively, which show that the presence of copper enhances complete ethanol oxidation to CO 2 after calibration of the m/z = 44 mass signal.

Source link: https://europepmc.org/article/MED/36605655

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions