Article
Chemistry, Analytical
Daisuke Kozaki, Masanobu Mori, Shinichi Hamasaki, Tomotaka Doi, Souma Tanihata, Atushi Yamamoto, Takeshi Takahashi, Koutarou Sakamoto, Shigeto Funado
Summary: A simple method using enclosed quartz cell and cold vapour-atomic absorption spectrometry is proposed for determining total inorganic mercury in solution, achieving similar precision to conventional methods while reducing sample volume, reductant, and cost.
ANALYTICAL METHODS
(2021)
Article
Biochemistry & Molecular Biology
Maria Luisa Astolfi, Marcelo Enrique Conti, Martina Ristorini, Maria Agostina Frezzini, Marco Papi, Lorenzo Massimi, Silvia Canepari
Summary: Bees and their products are useful bioindicators of anthropogenic activities and can help overcome the limitations of air quality networks. This study developed a simple analytical method to determine mercury content in bees and beehive products, and evaluated its performance on real samples collected in six areas of the Lazio region, Italy.
Article
Chemistry, Analytical
Jaromir Vyhnanovsky, Dilek Yildiz, Barbora Stadlerova, Stanislav Musil
Summary: The study achieved photochemical vapor generation of bismuth with optimal conditions determined through investigating the influence of sensitizers and reaction medium flow rate. Combining PVG with atomic fluorescence spectrometry can provide low limits of detection at a low operation cost.
MICROCHEMICAL JOURNAL
(2021)
Review
Chemistry, Analytical
Guanghui Niu, Alexander Knodel, Sebastian Burhenn, Sebastian Brandt, Joachim Franzke
Summary: The development of miniature, sensitive, high throughput, and in-situ analytical instruments using dielectric barrier discharge (DBD) has become a hot topic in modern analytical chemistry. DBD offers advantages such as easy operation, simple configuration, ambient working temperature and pressure, low power consumption, and miniature dimension. Its applications in analytical atomic spectrometry include serving as excitation or atomization sources in AES, AAS, and AFS, as well as functioning as a vapor generation system.
ANALYTICA CHIMICA ACTA
(2021)
Article
Biochemistry & Molecular Biology
Simion Bogdan Angyus, Erika Levei, Dorin Petreus, Radu Etz, Eniko Covaci, Oana Teodora Moldovan, Michaela Ponta, Eugen Darvasi, Tiberiu Frentiu
Summary: A new direct liquid microsampling method for simultaneous determination of elements has been proposed, which is cost-effective, free from derivatization, and has low detection limits. The method involves efficient analysis in low-power and low-Ar consumption equipment, suitable for various environmental sample analysis.
Article
Engineering, Electrical & Electronic
Chittatosh Pal, Subrata Majumder
Summary: This study demonstrates a label-free electrochemical sensor based on carboxylated MoS2 flakes functionalized with poly (Thymine), which can detect Hg2+ ions at extremely low concentrations in the aqueous medium. The sensor offers low detection limits, high selectivity, and good results in real samples.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Analytical
Jie Zhang, Rongxing Zhou, Yanwen Jin, Nansheng Cheng
Summary: A magnetic immunoassay-based diagnostic platform has been developed for cancer biomarker detection by combining rolling circular amplification with ICP-MS, achieving detection of tumor biomarkers in patient samples for potential clinical diagnosis applications.
MICROCHEMICAL JOURNAL
(2021)
Article
Food Science & Technology
Karl Bryan S. Perelonia, Kathlene Cleah D. Benitez, Riza Jane S. Banicod, Gezelle C. Tadifa, Flordeliza D. Cambia, Ulysses M. Montojo
Summary: This paper validates an analytical method for determining heavy metal content in fish and fishery resources using microwave-assisted digestion method combined with Graphite Furnace Atomic Absorption Spectrometry (GFAAS) and Cold Vapor Atomic Absorption Spectrometry (CVAAS). The method showed high reliability and accuracy in terms of experimental parameters, linearity, and accuracy.
Review
Agriculture, Multidisciplinary
Xue Li, Tengpeng Liu, Chunyan Chang, Yajie Lei, Xuefei Mao
Summary: Agrometallomics, as an independent interdisciplinary field, plays a crucial role in understanding the molecular and organismic mechanisms in agriculture. Advanced analytical approaches for metallic elements are necessary for investigating their existence, concentration, distribution, speciation, and forms in agricultural lives and media.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2021)
Article
Materials Science, Coatings & Films
S. M. Johnson, J. P. Zhao, C. Schlechte, J. Carroll, T. Iwao, P. L. G. Ventzek, J. G. Ekerdt
Summary: Plasma-enhanced atomic layer deposition of SiNx has potential for device applications, but its growth and material property conformality on three-dimensional surfaces are limited. Modifying the composition of the nitridation plasma can affect side wall nitridation. The impact of power frequency on neutral species formation in plasma deposition experiments has not been sufficiently explored.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Chemistry, Analytical
Tengpeng Liu, Jixin Liu, Xuefei Mao, Xing Na, Yunbin Shao, Yongzhong Qian
Summary: In this study, a foamed nickel trap was used as a gas-phase enrichment material to preconcentrate and release Cd. The developed method showed high sensitivity and precision for the direct detection of Cd in soil samples. It eliminated the need for acid digestion and has potential for miniaturization and portability in the future.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2022)
Article
Chemistry, Analytical
Lindomar A. Portugal, Edwin Palacio, Rejane Frizzarin, Joao H. Santos Neto, Victor Cerda, Sergio L. C. Ferreira
Summary: This work proposes an automated strategy for the speciation of inorganic selenium in infusion tea samples. The system utilizes an MSFIA-CVG-AFS system and sodium tetrahydroborate for chemical vapor generation. The method involves an online prereduction step to convert selenium (VI) to selenium (IV) before determining the total selenium concentration. The chemical parameters were optimized using a fractional factorial design. The method exhibited low detection and quantification limits, with a linear range and good precision. This method was successfully applied to analyze inorganic selenium speciation in commercially purchased tea samples.
Article
Engineering, Electrical & Electronic
Baoyun Ge, Daniel C. Ludois
Summary: This article introduces an analytical approach for evaluating the capacitance coupling matrix and computing the conductance model in planar power conversion apparatuses, offering a solution for the design and optimization of high-performance power conversion systems. Compared to conventional finite-element analysis, this method provides faster computation speed and relatively small errors.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Chemistry, Analytical
Yineng Wang, Xi Cao, Walter Messina, Anna Hogan, Justina Ugwah, Hanan Alatawi, Ed van Zalen, Eric Moore
Summary: Capillary electrochromatography (CEC) combines liquid chromatography (LC) and capillary electrophoresis (CE), providing rapid separations, high efficiency, and high selectivity. The use of capacitively coupled contactless conductivity detection (CD-D-4) allows for contactless electrode configuration, preventing contamination.
Review
Instruments & Instrumentation
Qing Yang, Yilan Zhao, Huimin Yu, Xiaoli Xiong, Ke Huang
Summary: Analytical atomic spectrometry is a widely-used technique for detecting inorganic elements in diverse samples. Sample pretreatment methods, such as extraction and preconcentration, are critical for elemental analysis. This review focuses on the applications and advancements of various sample separation and preconcentration techniques in analytical atomic spectrometry.
APPLIED SPECTROSCOPY REVIEWS
(2023)
Article
Green & Sustainable Science & Technology
Ioana Andreea Petrean, Valer Micle, Ioana Monica Sur, Marin Senila
Summary: This paper describes a former sterile dump site resulting from mining and ore processing. The study used inductively coupled plasma optical emission spectrometry to analyze the contaminated area and determine whether it requires remediation. The results showed the importance of obtaining quantitative analysis data and utilizing modern multispectral analytical devices for characterizing and remediating heavy metal contaminated areas.
Article
Chemistry, Multidisciplinary
Thomas Dippong, Erika Andrea Levei, Iosif Grigore Deac, Mihaela Diana Lazar, Oana Cadar
Summary: (Co0.4Zn0.4Ni0.2Fe2O4)(alpha)(SiO2)((100-alpha)) samples with different proportions of Co0.4Zn0.4Ni0.2Fe2O4 nanoparticles embedded in SiO2 were synthesized and characterized. The samples were analyzed using various techniques including thermal analysis, Fourier-transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, inductively coupled plasma optical emission spectrometry, and magnetic measurements. The results showed the formation of poorly crystalline Co-Zn-Ni ferrite at low annealing temperatures and highly crystalline Co-Zn-Ni ferrite along with traces of Fe2SiO4 and SiO2 at higher annealing temperatures. The magnetic properties improved with the increase in ferrite content and annealing temperature.
Article
Chemistry, Multidisciplinary
Daniela Alexandra Scurtu, Eniko Kovacs, Lacrimioara Senila, Erika Andrea Levei, Dorina Simedru, Xenia Filip, Monica Dan, Cecilia Roman, Oana Cadar, Leontin David
Summary: Due to concerns over environmental impacts in the construction industry, researchers have been studying ways to develop sustainable materials using waste. This study introduces an innovative cement-based composite material containing vine shoot waste, which enhances hydration product formation and leads to a more compact and dense structure. Various techniques, including microscopy and spectroscopy, were used to characterize the structure and confirm the increased hydration product formation.
APPLIED SCIENCES-BASEL
(2023)
Article
Environmental Sciences
Martine Van Poppel, Jan Peters, Erika Andrea Levei, Luminita Marmureanu, Ana Moldovan, Maria -Alexandra Hoaghia, Cerasel Varaticeanu, Jo Van Laer
Summary: A mobile monitoring campaign was conducted to assess the black carbon (BC) concentrations in Cluj-Napoca city, Romania, before, during and after COVID-19 lock-down. The study found marked spatial and temporal differences in BC concentrations, attributed to traffic intensities. The COVID-19 measures impacted traffic volumes, leading to a decrease in average BC concentrations.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Chemistry, Physical
Oana Cadar, Irina Vagner, Ion Miu, Daniela Scurtu, Marin Senila
Summary: The clarity of beer is crucial for its marketability and consumer approval. This study tested natural zeolite as a substitute filter media for diatomaceous earth in removing unwanted constituents that cause beer haze formation. The results showed that natural zeolites are promising aids for beer filtration, with no significant changes in brewery industry process equipment and protocols for preparation.
Article
Chemistry, Physical
Marin Senila, Emilia Neag, Claudiu Tanaselia, Lacrimioara Senila
Summary: The capacity of thermally treated natural zeolite to remove Cs+ and Sr2+ ions from aqueous solutions was investigated. The removal efficiency varied depending on factors such as initial concentrations, contact time, amount, and particle size of the adsorbent material. The sorption kinetics were described by the pseudo-second-order kinetic model.
Article
Environmental Sciences
Maria-Alexandra Resz, Cecilia Roman, Marin Senila, Anamaria Iulia Torok, Eniko Kovacs
Summary: This study characterized water wells used as drinking sources in a Romanian urban area in terms of typology, chemical parameters, heavy metal pollution, and human health risk assessment. The results showed contamination with nitrogen compounds and Cd, Mn, and Pb, but based on health risk assessment, the water was found to be safe for drinking in terms of heavy metal content for both adults and children, although non-carcinogenic risks in NO2- and NO3- could occur if consumed excessively.
Article
Environmental Sciences
Anamaria Iulia Torok, Ana Moldovan, Claudiu Tanaselia, Eniko Kovacs, Ionut Cornel Mirea, Oana Teodora Moldovan, Erika Andrea Levei
Summary: Natural and anthropogenic factors significantly affect the concentration of major and trace elements, anions, and Sr isotopic signatures in groundwater. This study focused on the Sr isotopic signature in the groundwater of karst areas in Romania and its relation to water chemistry. The main source of Sr was found to be carbonate dissolution, particularly of calcite. The Sr concentration showed spatial variation and a slight decrease in winter compared to spring. The Sr-87/Sr-86 isotopic ratio indicated the type of dissolution, with high values suggesting silicate dissolution.
Article
Microbiology
Diana Felicia Bogdan, Andreea Ionela Baricz, Iulia Chiciudean, Paul-Adrian Bulzu, Adorjan Cristea, Ruxandra Nastase-Bucur, Erika Andrea Levei, Oana Cadar, Cristian Sitar, Horia Leonard Banciu, Oana Teodora Moldovan
Summary: This study aimed to evaluate the diversity, abundance, distribution, and organic substrate preferences of microbial communities from Pestera cu Apa din Valea Lesului (Lesu Cave) located in the Apuseni Mountains (North-Western Romania). 16S rRNA gene amplicon sequencing and community-level physiological profiling (CLPP) were used to assess the microbial communities, while environmental parameters of cave sediments and water were also analyzed. The results showed that Pseudomonadota (synonym Proteobacteria) was the most prevalent phylum detected across all samples, and the bacterial community at the order level was influenced by specific sites and microenvironmental conditions. The distribution pattern of dominant orders was correlated with different organic substrate sources, and physicochemical analysis revealed distinct geochemical characteristics of sediments and water. This information provides a starting point for further studies on the taxonomic and functional diversity of subterranean microbial communities.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Agronomy
Mirela Miclean, Erika Andrea Levei, Claudiu Tanaselia, Oana Cadar
Summary: Rare earth elements (REEs) and other elements in vegetables and soils near tailings management facilities in NW Romania were measured. Soil-to-plant transfer and health risks of vegetable consumption were assessed. The concentrations of REEs and other elements varied widely, with LREEs being more abundant. The study found no significant health risks from consuming vegetables with REEs, as the daily intake was below acceptable levels.
Article
Biochemistry & Molecular Biology
Thomas Dippong, Erika Andrea Levei, Ioan Petean, Iosif Grigore Deac, Raluca Anca Mereu, Oana Cadar
Summary: The impact of doping with different cations on the properties of CoFe2O4 nanoparticles synthesized via sol-gel method and calcined at different temperatures was investigated. The study found that doping cations affect the structural, thermal, kinetics, morphological, surface, and magnetic properties of the nanoparticles. Calcination at low temperatures results in low crystallinity while high temperatures lead to well-crystallized ferrites together with crystalline phases of the silica matrix. The structural and magnetic parameters of the nanoparticles also depend on the doping ion and calcination temperature.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Thomas Dippong, Oana Cadar, Iosif Grigore Deac, Lucian Barbu Tudoran, Erika Andrea Levei
Summary: This study investigates the effect of Ni2+ substitution by Co2+ on the structure, morphology, and magnetic properties of Co alpha Ni0.9-alpha Zn0.1Fe2O4 nanoparticles calcined at different temperatures. The results show that the presence of Co2+ and higher calcination temperatures lead to increased crystallite size, decreased porosity, increased magnetization, coercivity, and magnetocrystalline anisotropy. The nanoparticles exhibit superparamagnetic-like behavior at 400°C and ferrimagnetic-like behavior at higher calcination temperatures, making them potential candidates for various technical applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Environmental Sciences
Fran Nekvapil, Maria Mihet, Geza Lazar, Simona Cinta Pinzaru, Ana Gavrilovic, Alexandra Ciorita, Erika Levei, Tudor Tamas, Maria-Loredana Soran
Summary: The recovery and recycling of wasted resources are important global issues. Crustacean exoskeletons can be potential bio-friendly adsorbents, but their efficiency requires optimization. This study characterizes the exoskeletons of three crustacean species and assesses the impact of carotenoid extraction on the valorization of their porous powder.
Article
Chemistry, Multidisciplinary
Thomas Dippong, Erika Andrea Levei, Ioan Petean, Iosif Grigore Deac, Oana Cadar
Summary: This work synthesized MnFe2O4/SiO2 ceramic nanocomposites via sol-gel method and investigated the effect of metal ion doping and annealing temperature on their structure, morphology, and magnetic properties. It was found that the doping ion and annealing temperature had significant influence on the structural and magnetic parameters of the nanocomposites.
Article
Polymer Science
Lacrimioara Senila, Emese Gal, Eniko Kovacs, Oana Cadar, Monica Dan, Marin Senila, Cecilia Roman
Summary: This study successfully extracted poly(3-hydroxybutyrate) (PHB) from lignocellulosic biomass through a series of steps including microwave irradiation and enzymatic hydrolysis.
Article
Chemistry, Analytical
Michelle Buoso, Beatrice Campanella, Massimo Onor, Emanuela Pitzalis, Alessandro D'Ulivo
Summary: The use of BH intermediates as derivatization reagents significantly improves the tolerance to interference from transition metal ions in the generation of SbH3 and BiH3, and shows high tolerance in a wide range of acidity. The method has been successfully applied to the determination of Sb and Bi in complex samples, providing further understanding of the chemical behavior of borohydrides.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2024)
Article
Chemistry, Analytical
Chao-Feng Li, Xuan-Ce Wang, Zhu-Yin Chu, Peng Peng
Summary: Thermal ionization mass spectrometry (TIMS) is the standard method for obtaining precise Sr-87/Sr-86 isotopic ratios. However, our developed hydrofluoric acid coprecipitation method offers a low-cost, rapid, simple, and high-throughput alternative for analyzing red wine samples, effectively eliminating isobaric interference and matrix element inhibition.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2024)
Article
Chemistry, Analytical
Ivan B. Krstic, Bratislav M. Obradovic, Milorad M. Kuraica
Summary: This paper presents the spatio-temporal dynamics of a Grimm-type microsecond pulsed glow discharge (mu PGD) in argon at 6 mbar. The occurrence of a high current peak during the discharge ignition is analyzed and the importance of displacement current is emphasized. The development of electron excitation temperature for argon atoms and ions at various distances from the cathode is measured. The spatio-temporal evolution of selected spectral lines of argon and copper atoms and ions is analyzed during different phases of the discharge. The results suggest that the behavior of spectral line emissions differs between the pre-peak and afterglow periods, with different lines reaching maximum intensity during these phases. The appearance time and decay time of the afterpeak are shorter for ions than for atoms. These findings are explained in terms of three-body recombination processes and ion mobilities.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2024)
Article
Chemistry, Analytical
Qiuyun Wang, Anmin Chen, Xun Gao
Summary: In this paper, the combination of Tesla coil discharge (TCD) and laser-induced breakdown spectroscopy (LIBS) was used to enhance the emission of Al atomic lines and AlO molecular bands. The optimized distance between the TCD tip and the sample surface was found to be 5 mm, and the optimal laser energy was 25.1 mJ. Furthermore, TCD-SELIBS showed lower limits of detection (LoDs) for Cr and Pb elements compared to surface enhanced LIBS (SELIBS). The combination of TCD and LIBS is a promising technology for high-sensitivity analysis of heavy metals in water, with the advantages of simplicity, low cost, ease of operation, industrialization, and commercialization.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2024)
Article
Chemistry, Analytical
Yanwen Tang, Tingguang Lan, Jianfeng Gao, Zhongjie Bai, Xiaowen Huang, Junjie Han, Na Liu
Summary: Titanium is an important metal widely used in various industries. Ilmenite minerals are the main source of titanium metal and can be found in igneous and metamorphic rocks as well as different types of deposits. To accurately determine U-Pb ages of ilmenite, a new calibration method and appropriate reference materials are urgently needed. Laser ablation sector field inductively coupled plasma mass spectrometry has been used to minimize matrix effects and zircon 91500 has been identified as a suitable reference material for measuring the Pb/U ratio in ilmenite. The direct calibration method using zircon 91500 as an external standard has been found to be effective for in situ U-Pb dating of ilmenite samples under different ablation settings.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2024)