Article
Chemistry, Analytical
Maliheh Heidarbeigi, Mohammad T. Jafari, Mohammad Saraji
Summary: The study utilized a tandem microextraction method combining centrifuge free dispersive liquid-liquid microextraction and thin-film microextraction for the analysis of molinate in environmental samples, achieving high detection sensitivity and accuracy under optimized conditions. This approach offers a feasible method for the determination of molinate in real samples, with the recovery of spiked samples ranging between 82% and 113%.
Article
Biochemistry & Molecular Biology
Qian Sun, Xinyu Cui, Yanfeng Wang, Pingping Zhang, Wenjuan Lu
Summary: Ligands play a crucial role in the determination of cadmium in rice samples using flame atomic absorption spectrometry (FAAS). In this study, a comparative evaluation of 10 commercially available ligands for the formation of Cd(II)-ligand complex and determination of cadmium in rice samples was conducted using ultrasound-assisted dispersive liquid-liquid microextraction (UADLLME) combined with FAAS. Sodium diethyldithiocarbamate (DDTC) was identified as the most suitable ligand, and 1-heptanol and ethanol were chosen as the extraction and disperser solvent, respectively. Under the optimized experimental conditions, the method exhibited a low detection limit and good recovery rates for Cd(II) in different rice samples. The proposed method offers simplicity, cost-effectiveness, and accuracy for the analysis of Cd(II) in rice.
Article
Chemistry, Analytical
Mojdeh Mohammadi, Sara Khosravi, Amir Nili-Ahmadabadi, Mahdie Kamalabadi, Vahid Ghasemzadeh-Mohammadi, Abbas Afkhami
Summary: In this research, a novel method combining ion mobility spectrometry (IMS) and dispersive liquid-liquid microextraction was developed and validated for the fast and quantitative analysis of Ampyra (AMP) in real samples. The method utilized silver nanoparticles as modifier agents and improved sensitivity through the delay of carrier gas flow after sample injection. Under the optimized conditions, AMP was detected in the linear range of 0.4-16 µmol L-1 with a detection limit of 0.12 µmol L-1. The developed method was successfully applied to quantify AMP in urine samples and validated against HPLC-UV/Vis. The proposed method opens up new possibilities for developing simple, fast, and effective analytical methods.
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Adil Elik, Nail Altunay
Summary: This study presents an optimized magnetic ionic-based dispersive liquid-liquid microextraction (MIL-DLLME) method for the analysis and extraction of cadmium in water and food samples. The method exhibits good reliability and allows for accurate determination of cadmium content in water and food samples. Compared to conventional methods, this approach offers a fast, environmentally friendly, and simple way to determine cadmium with minimal solvent consumption and higher extraction capability.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2022)
Article
Chemistry, Analytical
Valfredo Azevedo Lemos, Jeferson Alves Barreto, Luana Bastos Santos, Rosivan dos Santos de Assis, Cleber Galvao Novaes, Ricardo J. Cassella
Summary: Dispersive liquid-liquid microextraction (DLLME) is widely used for the separation and preconcentration of various chemical species, with some systems using a syringe as an extraction environment. This review discusses methods utilizing this approach, critical aspects like dispersion promotion, analytical characteristics, and the pros and cons of the methods, as well as future trends in in-syringe microextraction systems.
Article
Chemistry, Analytical
Maria Consolacion Rodriguez-Palazon, Natalia Arroyo-Manzanares, Pilar Vinas, Natalia Campillo
Summary: This paper presents a new analytical method using DLLME and UHPLC-HRMS for the determination of capsaicin in human urine. The method showed low detection limits and good repeatability, and was successfully applied to the analysis of urine from patients treated with capsaicin-based drugs.
MICROCHEMICAL JOURNAL
(2022)
Article
Spectroscopy
Monireh Shahvalinia, Arash Larki, Kamal Ghanemi
Summary: In this study, a simple and cost-effective method based on UA-DLLME and smartphone colorimetric measurement was introduced for the separation and determination of TCS in contaminated waters. By optimizing various experimental parameters and considering their effects, this method can accurately measure TCS in a wide concentration range and provides satisfactory results in multiple water and wastewater samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Analytical
Yinghe Ji, Min Zhao, Anwen Li, Longshan Zhao
Summary: In this study, a deep eutectic solvent (DES) based on DL-lactic acid and trioctylmethylammonium chloride was used with ultrasonic-assisted dispersive liquid-liquid microextraction (UA-DLLME) for monitoring trace levels of Cd and As in wine samples. The method showed good linear relationships, low detection limits, and reliable accuracy and precision, providing practical value for analyzing heavy metal residues in wine and complex food matrices.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Alina Kalyniukova, Ivana Tomaskova, Vitezslava Peskova, Filip Pastierovic, Michal Samek, Jozsef Balogh
Summary: A novel dispersive liquid-liquid microextraction procedure combined with high-performance liquid chromatography and photodiode array detection was developed for the determination of ergosterol. The method showed linear calibration plot, with good recoveries and stability, suitable for the analysis of ergosterol in Norway spruce roots and various fungi samples.
MICROCHEMICAL JOURNAL
(2022)
Article
Chemistry, Analytical
Pilaipan Chaikhan, Yuthapong Udnan, Richmond J. Ampiah-Bonney, Wipharat Chuachuad Chaiyasith
Summary: A novel hybrid air-assisted solvent terminated dispersive liquid-liquid microextraction (AA-ST-DLLME) method using a domestic fish-tank pump as a bubble generator was developed for the determination of Pb in water and beverage samples by GFAAS. The method achieved a high enrichment factor, preconcentration factor, and extraction efficiency under optimized conditions, with low LOD and LOQ. The method was successfully applied for the determination of trace level of Pb in various samples, with satisfactory spiked recovery results and good agreement with standard reference materials.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Applied
Xu Jing, Xin Huang, Yiming Zhang, Min Wang, Haoyue Xue, Xiaowen Wang, Liyan Jia
Summary: The CD-DLLME method utilizes cyclodextrin as both the dispersion solvent and demulsifier to achieve dispersion and phase separation in the sample pretreatment process, offering advantages of simplicity, speed, low detection limits, and high recovery rates.
Article
Chemistry, Applied
Malek Hassan, Furkan Uzcan, Usama Alshana, Mustafa Soylak
Summary: A novel method combining switchable-hydrophilicity liquid-liquid microextraction and magnetic nanoparticle-based dispersive solid-phase microextraction was proposed for the determination of erythrosine using UV/Vis spectrophotometry. The method showed excellent analytical performance with high sensitivity, low detection limits, and good reproducibility, making it suitable for the extraction and determination of erythrosine in food and consumer products.
Article
Biochemical Research Methods
Dandan Ge, Zhizhuo Shan, Tongqing Pang, Xiaomin Lu, Baoling Wang
Summary: A new generation of hydrophobic deep eutectic solvents were used to extract Sudan dyes from food samples, showing a linear range of 2-1000 ng mL(-1) with high accuracy. The method was proven to be simple, green, and efficient, with successful application in determining Sudan dyes in complex matrices.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
Anahid Rezaeefar, Mahboob Nemati, Mir Ali Farajzadeh, Mohammad Reza Afshar Mogaddam, Farzaneh Lotfipour
Summary: The study developed a combined method of dispersive micro solid-phase extraction and dispersive liquid-liquid microextraction for the simultaneous extraction of five mycotoxins in soymilk samples. The method showed low limits of detection and quantification, with acceptable repeatability in analyzing different samples from the market. The proposed approach successfully detected aflatoxin B1 in all tested samples and ochratoxin A in one sample.
MICROCHEMICAL JOURNAL
(2022)
Article
Chemistry, Analytical
D. Sai Krishna, K. Madhavi, N. N. Meeravali, A. C. Sahayam
Summary: A rapid and highly sensitive vesicle mediated dispersive liquid-liquid microextraction procedure has been developed for the determination of parts per quadrillion level of beryllium in seawater and air filter samples. The method uses anionic vesicular surfactant and chelating agents to selectively extract beryllium, achieving excellent detection limits and recoveries across a range of sample types.
ANALYTICA CHIMICA ACTA
(2022)
Article
Environmental Sciences
Narcis Pous, Aina Barcelona, Luca Sbardella, Manuela Hidalgo, Jordi Colomer, Teresa Serra, Victoria Salvado
Summary: Nature-based wastewater treatments offer an economic and sustainable alternative to intensive technologies in rural areas, with a study showing the efficiency of a zooplankton-based reactor in treating urban wastewater for reuse. However, the robustness of the reactor against temperature and oxygen fluctuations needs improvement for consistent performance throughout the year.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Geochemistry & Geophysics
Joan Gutierrez-Leon, Jordi Cama, Ignasi Queralt, Jose Antonio Jimenez, Josep M. Soler
Summary: This study utilized experiments and modeling to identify that the main reactions were the dissolution of cement and rock, leading to the precipitation of gypsum, aragonite, brucite, and Fe-and Al-poorly crystalline phases. Additionally, Cd, Ni, and Zn hydroxides, Zn carbonates, and the adsorption or co-precipitation of Cu and As on specific minerals were observed as part of the geochemical processes caused by AMD exposure.
APPLIED GEOCHEMISTRY
(2021)
Article
Spectroscopy
Marcin Musielak, Karina Kocot, Beata Zawisza, Ewa Talik, Eva Margui, Ignasi Queralt, Beata Walczak, Rafal Sitko
Summary: This study developed a method for the determination of ultratrace heavy metal ions by using a preconcentration method with GO/CNTs membranes and TXRF, achieving efficient sorption and detection of Co, Ni, Cu, Zn, Cd, and Pb ions. The method yielded high recoveries for all elements at pH 5, with minimal sample requirement and compliance with green analytical chemistry principles.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2021)
Article
Spectroscopy
Eva Margui, Jasna Jablan, Ignasi Queralt, Fabjola Bilo, Laura Borgese
Summary: This study evaluates the possibilities and drawbacks of combining simple sample treatments with total reflection X-ray fluorescence spectrometry (TXRF) for the analysis of various biological samples, based on experiments with different types of biological samples to estimate the analytical capabilities of the proposed TXRF methods.
X-RAY SPECTROMETRY
(2022)
Article
Green & Sustainable Science & Technology
Lidia Fernandez-Rojo, Josep M. Soler, Gabriela Davila, M. Carme Chaparro, Ignasi Queralt, Jordi Cama
Summary: This study investigated the geochemical alteration between wellbore Portland cement and various rocks under different CO2 storage conditions. Results showed that cement dissolution varied under atmospheric and supercritical conditions.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Spectroscopy
Eva Margui, Rogerta Dalipi, Emanuele Sangiorgi, Maja Bival Stefan, Katarina Sladonja, Vanessa Rogga, Jasna Jablan
Summary: This study compared results of essential element analysis in vegetation samples using different analytical approaches, finding suspension preparation and TXRF analysis to be sustainable and fast alternatives compared to traditional digestion and ICP-OES or FAAS analysis. Different methods were applied to herbal tea analysis for medicinal purposes.
X-RAY SPECTROMETRY
(2022)
Article
Chemistry, Analytical
Eva Margui, Ignasi Queralt, Sofia Pessanha, Jasna Jablan, Ivana Bacic, Mirta Pavic
Summary: This study investigates the conservation and long-term preservation of two painted wooden reliefs created by Croatian contemporary artist Vasko Lipovac in the early 1970s. By analyzing the chemical composition of the paint pigments and binders, the study ensures stability and long-term preservation of the artworks. Through a comprehensive analytical approach involving different instrumental techniques, the study reveals the complex mixture of inorganic compounds present in the painted wooden reliefs and provides insights into the use of cadmium red and synthetic pigments in the artworks.
MICROCHEMICAL JOURNAL
(2022)
Article
Chemistry, Applied
E. Margui, I. Queralt, D. Andrey, L. Perring
Summary: In this study, the potential of total reflection X-ray fluorescence (TXRF) instrumentation for analyzing major and trace elements in milk powder was evaluated. The findings showed that TXRF, with appropriate calibration approaches, can provide acceptable results for K, Ca, Fe, and Zn determination. However, for light elements such as P and Cl, only screening results can be obtained.
Article
Environmental Sciences
E. Margui, I. Queralt, E. de Almeida
Summary: This review provides an overview of the applications of X-ray fluorescence instrumentation in environmental science research from 2006 to 2020. It describes the basic principles, instrumentation, and advances in the field, highlighting the potential of XRF for environmental assessment.
Article
Green & Sustainable Science & Technology
Anna Anglisano, Lluis Casas, Ignasi Queralt, Roberta Di Febo
Summary: This article explores the performance of supervised machine learning classification methods for provenancing archaeological pottery through the use of freeware R code. An illustrative example was used to show the steps and effectiveness of the new method, and the provided code and notes make it accessible for both novices and experienced users to apply and further develop.
Article
Spectroscopy
I. Queralt, S. Pessanha, M. L. Carvalho, M. Manso
Summary: In this study, the features of a modern Chinese cloisonné vase were investigated using small-spot energy dispersive X-ray fluorescence (EDXRF) and micro-Raman spectroscopy. Quantitative analysis of enamel revealed the presence of eleven different colored enamels, with chromium, manganese, iron, cobalt, copper, antimony, and cadmium identified as the main coloring agents. The body of the vase was made of copper with minor amounts of zinc and tin. Metal coatings applied for decoration were also found on the surface of the vase, with the gilded coatings consisting of a thick layer made by silver-doped nickel.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2023)
Article
Spectroscopy
Georgia P. Vlamaki, Nikolaos G. Kallithrakas-Kontos, Ignasi Queralt, Manuela Hidalgo
Summary: This study attempts to determine platinum in aqueous samples at low concentrations using energy-dispersive X-ray fluorescence (EDXRF) for the first time. Selective complexing membranes were used and optimized, resulting in a minimum detection limit of 4 μg/L.
X-RAY SPECTROMETRY
(2023)
Article
Geochemistry & Geophysics
Max G. Giannetta, Josep M. Soler, Ignasi Queralt, Jordi Cama
Summary: The study focuses on the Victoria Mine in the Aran Valley, examining the processes influencing metal mobility in the environment. Three sampling campaigns provide a spatiotemporal dataset showing the evolution of solute concentrations along a flow path. Rainwater dissolves ore materials, causing elevated metal concentrations, and precipitation of hydrozincite serves as a metal-removal mechanism, significantly reducing metal concentrations.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2023)
Article
Geochemistry & Geophysics
Lluis Casas, Anna Anglisano, Roberta Di Febo, Berta Pedreno, Ignasi Queralt
Summary: A multi-analytical approach is usually used in provenance studies of archaeological marbles. However, for very similar marble varieties, additional techniques and approaches are needed. In this paper, a case study is conducted on two Catalan marble districts and three sets of archaeological marbles to illustrate this. The results demonstrate that supervised classification models can successfully discriminate between quarries without any special data transformation, providing valuable insights into the origin and use of these marbles.
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)