Article
Environmental Sciences
Wouter Deleersnyder, David Dudal, Thomas Hermans
Summary: This paper proposes an appraisal tool for evaluating the inconsistency between the inversion model and multidimensional data, using a normalized gradient calculated based on multidimensional forward modeling. Additionally, an alternative approach is suggested to account for imperfect forward modeling with low computational cost. The method is demonstrated on an AEM survey, revealing potential problematic zones in the estimated fresh-saltwater interface.
Article
Chemistry, Analytical
Kevin Iyere Ehiosun, Regis Grimaud, Ryszard Lobinski
Summary: This review discusses the state-of-the-art of mass spectrometry as a reliable analytical technique for identifying and quantifying carboxylic acid metabolites, as well as the challenges and applications in this field.
TRENDS IN ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Energy & Fuels
Jiabin Huang, Xiaoqing Wu, Qifeng Hou, Mengqi Wu, Jiuzhong Yang, Feng Zhang
Summary: This study measured the PICS of various benzene compounds with different substituents using PIMS, revealing that nitrogen-containing substituents enhance the plateau characteristics of PICS. Molecular orbital analysis elucidates the origin of PICS characteristics of monocyclic substituted aromatic compounds.
Article
Environmental Sciences
Angela Arcoleo, Federica Bianchi, Maria Careri
Summary: An eco-friendly method involving microextraction by packed sorbent (MEPS) coupled to gas chromatography-mass spectrometry (GC-MS) was developed for the determination of PAHs in snow samples collected from polar regions. The method proved suitable for ultra-trace analysis of PAHs and was successfully applied to assess PAH concentrations in surface snow samples from Northern Victoria Land, Antarctica, where local emission sources were found to influence PAH levels.
Article
Chemistry, Analytical
N. Riboni, F. Bianchi, M. Scaccaglia, F. Bisceglie, A. Secchi, C. Massera, P. Luches, M. Careri
Summary: Novel solid-phase microextraction coatings based on MWCNT-CD nanocomposites were developed for ultratrace determination of 16-priority PAHs in snow samples. The use of MWCNTs-H2O2-γ-CD fiber showed superior results in facilitating the interactions between MWCNTs and CDs. The method proved to be reliable with detection and quantitation limits below 0.7 and 2.3 ng/L, RSD lower than 21%, and recoveries of 88(+/- 2)-119.8(+/- 0.4)%.
Article
Biochemical Research Methods
Anika Neumann, Ole Tiemann, Helly J. Hansen, Christopher P. Rueger, Ralf Zimmermann
Summary: In this work, the ionization characteristics of a xenon discharge lamp (Xe-APPI) were studied and compared to established ionization schemes. The Xe-APPI proved efficient in ionizing a broad range of polycyclic aromatic hydrocarbons and their derivatives, but not thiol and ester compounds. It had a high tendency to generate oxygenated artifacts. Compared to other ionization methods, Xe-APPI had almost no chemical background and showed a high selectivity for low alkylated aromatic core structures.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2023)
Review
Biochemical Research Methods
Delphine Zanella, Monica Romagnoli, Sofia Malcangi, Marco Beccaria, Tatiana Chenet, Chiara De Luca, Fabio Testoni, Luisa Pasti, Ugo Visentini, Giampiero Morini, Alberto Cavazzini, Flavio A. Franchina
Summary: One convenient strategy to reduce environmental impact and pollution involves the reuse and revalorization of waste produced by modern society. Gas chromatography plays an important role in studying pyrolysis oils and organic contaminants, providing molecular composition information for tailoring the pyrolysis process and detecting contaminants. The molecular characterization of waste stream products, particularly pyrolysis oils, is crucial for their efficient utilization and further purification processes.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Environmental Sciences
Behrouz Akbari-Adergani, Kosar Mahmood-babooi, Ali Salehi, Gholamreza Jahed Khaniki, Nabi Shariatifar, Parisa Sadighara, Tayebeh Zeinali
Summary: The study determined the content of polycyclic aromatic hydrocarbons (PAHs) in Tahdig prepared with edible oil using GC-MS, finding that bread had significantly higher PAH content compared to potatoes. The high molecular weight PAHs were more predominant than the low molecular weight PAHs in both bread and potato Tahdigs. Due to high PAH contamination, consumption of any type of Tahdig was not recommended.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2021)
Article
Chemistry, Analytical
Emily Awuor Ouma, Helga Huszar, Laszlo Horvath, Gabor Szabo, Csaba Janaky, Zoltan Bozoki
Summary: In this work, a near-infrared diode laser-based photoacoustic system was used to achieve quasi-simultaneous measurement of 14NH3 and 15NH3 concentrations. By selecting appropriate wavelengths and using fast tuning methods, sensitive detection was achieved while avoiding interference.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Xiao Zhang, Jiachen Li, Yuan-Yao Li, Yunha Jung, Yun Kuang, Guanzhou Zhu, Yongye Liang, Hongjie Dai
Summary: A stable and selective electrocatalytic carbon dioxide reduction reaction (CO2RR) to C2+ products was achieved using a Cu electrocatalyst on a hydrophobic gas-diffusion layer (GDL) electrode in near-neutral KCl electrolytes. The instability of the catalyst in alkaline media under cathodic CO2RR conditions was largely suppressed by using a near-neutral electrolyte, showcasing the potential for long-term stability in CO2RR applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Environmental Sciences
Yayan Tong, Shuangying Li, Yalin Wu, Jinghan Guo, Boyao Zhou, Qingxiang Zhou, Liushan Jiang, Jingwen Niu, Yue Zhang, Huanhuan Liu, Shuai Yuan, Shiyu Huang, Yali Zhan
Summary: Graphene oxide modified magnetic polyamidoamine dendrimers nanoparticles were successfully prepared for magnetic solid phase extraction of polycyclic aromatic hydrocarbons from water, demonstrating excellent adsorption properties.
Article
Chemistry, Analytical
Zhengwang Wang, Yanjun Huang, Yalan Hu, Sheng Peng, Xiaoru Peng, Zhi-Wei Li, Juan Zheng, Fang Zhu, Gangfeng Ouyang
Summary: This study focuses on the precise quantifications of trace polycyclic aromatic hydrocarbons (PAHs) using a novel SPME coating made from Rubrene via Friedel-Crafts reaction. The resulting HCP-Rub coating possesses rich micropores, strong hydrophobicity, and large conjugated structure, making it ideal for efficient enrichment of PAHs. Compared to commercial fibers, the HCP-Rub coated fiber exhibits higher extraction efficiencies for PAHs and enables the establishment of a sensitive analytical method. The method was successfully applied to the determination of trace PAHs in environmental water samples with good recoveries.
MICROCHEMICAL JOURNAL
(2022)
Article
Environmental Sciences
Pedro Hermano M. Vasconcelos, Andre Luiz M. Camelo, Ari Clecius A. de Lima, Helio O. do Nascimento, Carla B. Vidal, Ronaldo F. do Nascimento, Gisele S. Lopes, Elisane Longhinotti
Summary: Chemometric tools were applied to optimize a fast-solid phase microextraction procedure for the analysis of polycyclic aromatic hydrocarbons in oil-based produced water. The optimized conditions included specific concentrations, time, temperature, and salt concentration, resulting in low detection limits and good recovery rates. This methodology was identified as a suitable and efficient analytical strategy for determining PAHs in produced water from the oil-based industry.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Hyeon Su Heo, Sumin Pyo, Bo Sung Kang, Jung Sul Jung, Gwang Hoon Rhee, Young-Min Kim, Ji Man Kim, Young-Kwon Park
Summary: In this study, the feasibility of low-cost catalysts (gamma-Al2O3, spent FCC catalyst, and natural zeolite) in the pyrolysis of wood-plastic composite (WPC) was evaluated using thermogravimetric and pyrolyzer-gas chromatography/mass spectrometry analyses. The use of low-cost catalysts during catalytic fast pyrolysis (CFP) was found to decrease the decomposition temperature of polyethylene and polypropylene in WPC. Natural zeolite exhibited the lowest activation energy (Ea) of CFP, followed by spent FCC catalyst and gamma-Al2O3, respectively. Although CFP over natural zeolite was less effective in decreasing the production of low-quality hydrocarbons, paraffins, and olefins compared to spent FCC catalyst and gamma-Al2O3, it produced the largest amount of value-added aromatic hydrocarbons due to its high and strong acidity.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Thermodynamics
Keisuke Kanayama, Ajit K. Dubey, Takuya Tezuka, Susumu Hasegawa, Hisashi Nakamura, Kaoru Maruta
Summary: This study investigated the production of aromatic hydrocarbons and smaller stable species from fuel-rich CH4/air mixtures using experiments and chemical kinetics simulations. The results showed that the estimation of C2H2 was problematic and there were large discrepancies in the prediction of benzene and naphthalene at high equivalence ratios. Improvements in the chemical kinetics model, including reactions with methyl radical, are necessary for more accurate predictions.
COMBUSTION SCIENCE AND TECHNOLOGY
(2022)