Article
Chemistry, Analytical
Mohanna Ezati, Soleyman Moinfar, Somayeh Mohammadi, Gholamreza Khayatian
Summary: A new liquid phase microextraction method CSDF-ME was developed for the enrichment and determination of cobalt in water samples, with an enrichment factor of 167, linear calibration graph in the range of 5-200 μg/L, and a detection limit of 1.3 μg/L. The accuracy and applicability of the proposed method were verified through analysis of real water samples and spiked synthetic samples.
JOURNAL OF ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Lei Jin, Zhao-Yun Wang, Zhuan-Yun Cai, Jia-Qiang Yang, An-Ni Zheng, Fang-Zu Yang, De-Yin Wu, Dongping Zhan
Summary: In this work, a novel PAN-based acidic sulfate copper electroplating process is developed for compact, homogeneous, and conformal copper thickening of through holes (TH). The adsorption characteristics, electrochemical properties, and interaction mechanisms of three additives (PEG, SPS, and PAN) are studied. SEM and OM analysis show that PAN leads to fine-grained copper coating and high throwing power in TH. Theoretical calculations demonstrate that PAN has the highest binding energy with the copper surface among the three additives. Cyclic voltammetry experiments confirm the accelerated and weakly suppressed copper electrodeposition by PAN at the center and mouth of TH, respectively. The addition of PAN to the solution containing PEG and SPS significantly decreases the relative electric charge, achieving closer copper electronic electroplating rate at the center and mouth of TH. The complex synergistic effects of PEG, SPS, and PAN contribute to the compact, homogeneous, and conformal copper thickening of TH.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Review
Chemistry, Analytical
Guizhen Li, Kyung Ho Row
Summary: This article provides an overview of the application and advances of single-drop microextraction in the determination of antibiotics in environmental water. This technique is cost-effective, environmentally friendly, and in line with the principles of green analytical chemistry. The two main approaches of single-drop microextraction (direct immersion and headspace) are reviewed, and the impressive analytical features and future perspectives of this technique are discussed.
JOURNAL OF SEPARATION SCIENCE
(2022)
Article
Multidisciplinary Sciences
Ozgur Ozalp, Mustafa Soylak
Summary: Fe3O4@XAD-16 was utilized as an adsorbent for magnetic dispersive solid phase extraction of Cu(II), achieving efficient enrichment of the target analyte. The optimized enrichment method demonstrated high accuracy in determining copper contents in food and water samples.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY TRANSACTION A-SCIENCE
(2021)
Article
Metallurgy & Metallurgical Engineering
Aamir Iqbal, M. Rasul Jan, Jasmin Shah
Summary: In this study, activated carbon was synthesized from sawdust and modified to extract cadmium, lead and nickel from waste electrical and electronic equipment (WEEE). The modified adsorbent showed high retention factor for the metal ions and can be regenerated for multiple use. The method proved efficient even with high sample volumes, with significant enrichment factors achieved for the target metal ions.
Article
Spectroscopy
Ziheng Xie, Huihui Jiang, Xiangmin Zhang, Jing Wang
Summary: The paper introduces a colorimetric and ratiometric chemosensor for hydrogen sulfide detection based on the ensemble of 1-(2-pyridylazo)-2-naphthol and zinc ions. This sensor utilizes the hydrogen sulfide-induced dissolution of the ensemble to detect hydrogen sulfide efficiently, with a low limit of detection.
SPECTROSCOPY LETTERS
(2021)
Article
Chemistry, Applied
Zexin Ma, Tingyong Zhao, Shiyao Cui, Xiaoning Zhao, Yong Fan, Jiangping Song
Summary: A novel method for the analysis of ethyl carbamate in wine has been developed through matrix modification assisted headspace single-drop microextraction and GC-MS techniques. The method showed good linearity, low detection and quantification limits, high accuracy, and precision. The results indicated that this method is a reliable alternative to solid phase extraction for the detection of ethyl carbamate in wine samples.
Article
Chemistry, Analytical
Leane Santos Nunes, Maria Gracas Andrade Korn, Valfredo Azevedo Lemos
Summary: A method based on direct-immersion single-drop microextraction was developed for the determination of vanadium in water. The extraction solvent used was the ionic liquid [C6MIM][PF6], and digital images obtained directly from the solvent drop were used for detection. This method showed high sensitivity and accuracy, with minimal sample volume and waste generation, aligning with the principles of green chemistry.
Article
Chemistry, Analytical
Yongrong Jiang, Xuezhi Dong, Yuzhe Li, Yan Li, Ying Liang, Min Zhang
Summary: This work introduces a lab-made automatic flow-batch system for headspace single-drop microextraction and on-drop conductometric sensing of ammonium. The method shows a linear relationship between conductivity and ammonium concentration, with good recoveries in water samples. This green chemistry approach avoids the use of harmful reagents.
Article
Biochemical Research Methods
Lanna K. Silva, Jose H. G. Rangel, Natilene M. Brito, Eliane R. Sousa, Erika M. L. Sousa, Diana L. D. Lima, Valdemar Esteves, Arlan S. Freitas, Gilmar S. Silva
Summary: In this study, a liquid-liquid microextraction method using SFODME was combined with liquid chromatography and UV/Vis detection to determine three NSAIDs in water samples. The optimized method showed low detection limits, satisfactory recovery rates, and successful application in water samples with different characteristics. SFODME demonstrated simplicity, low cost, speed, and high concentration capacity of the analytes.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
Gabriela Mafra, Camila Will, Ricardo Huelsmann, Josias Merib, Eduardo Carasek
Summary: In this study, a lab-made parallel single-drop microextraction methodology using a magnetic ionic liquid was developed to determine pesticides in human urine samples. The method exhibited satisfactory analytical performance and was successfully applied to two human urine samples.
JOURNAL OF SEPARATION SCIENCE
(2021)
Article
Chemistry, Analytical
Yao Yao, Tao Hu, Yaqian Chai, Jiahe Ju, Jinghui Zhang, Wei Shen, Haiwei Shi, Chang Liu, Cheng Huang, Sheng Tang
Summary: In this study, a single-drop microreactor combined with a target-triggered catalytic hairpin assembly and hybridization chain reaction amplification cascades strategy was successfully used to detect residual antibiotics in biological samples. The introduction of magnetic three-phase single-drop microextraction provided a stable reaction environment for signal amplification. The strategy demonstrated a low limit of detection, wide linearity range, and eliminated matrix effects in real samples.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Biochemical Research Methods
Jae Bem You, Detlef Lohse, Xuehua Zhang
Summary: The article introduces a green, fast one-step method called nanoextraction for extraction and detection of target analytes from dense suspensions, achieving a limit of detection for a fluorescent model analyte obtained from particle suspension samples. Research shows that high particle concentration in suspension samples does not reduce extraction efficiency.
Article
Biochemistry & Molecular Biology
Yixiao Wang, Jinhua Li, Ling Ji, Lingxin Chen
Summary: Residues and abuse of antibiotics have posed serious threats to ecological balance and human health. Determining antibiotics levels is difficult due to their low levels and multiple categories. Appropriate sample pretreatment is necessary to enrich trace amounts of antibiotics and eliminate matrix interference before chromatographic analysis. Dispersive liquid-liquid microextraction (DLLME) is an ideal pretreatment technique due to its simplicity, effectiveness, and low consumption. In this study, ultrasonic-assisted DLLME (UA-DLLME) was developed for the simultaneous extraction of seven sulfonamides antibiotics in environmental water and seafood samples. The UA-DLLME-HPLC method showed promising potential for multiresidue analysis of antibiotics.
Review
Biochemical Research Methods
Hongyan Wu, Chiranjeevi Kanike, Arnab Atta, Xuehua Zhang
Summary: This article presents a review on nanoextraction based on surface nanodroplets, which can continuously extract and enrich target analytes from a sample solution in a continuous flow system. Nanoextraction is characterized by its simplicity in operation, low consumption of organic solvent, and high enrichment factor. The article also summarizes the formation principle and key features of surface nanodroplets, and discusses the major findings of nanoextraction combined with in-droplet chemistry for sensitive and quantitative detection. Lastly, the future trend of nanoextraction is discussed.
Article
Chemistry, Analytical
Jeferson Alves Barreto, Rosivan dos Santos de Assis, Luana Bastos Santos, Ricardo Jorgensen Cassella, Valfredo Azevedo Lemos
MICROCHEMICAL JOURNAL
(2020)
Review
Green & Sustainable Science & Technology
Marcos Almeida Bezerra, Ricardo Erthal Santelli, Valfredo Azevedo Lemos, Juscelia Pereira dos Santos Alves, Bernardo Ferreira Braz, Luana Bastos Santos
CLEAN-SOIL AIR WATER
(2020)
Article
Food Science & Technology
Leane Santos Nunes, Maria das Gracas Andrade Korn, Valfredo Azevedo Lemos
FOOD ANALYTICAL METHODS
(2020)
Review
Chemistry, Analytical
Marcos Almeida Bezerra, Valfredo Azevedo Lemos, Djalma Menezes de Oliveira, Cleber Galvao Novaes, Jeferson Alves Barreto, Juscelia Pereira Santos Alves, Uillian Mozart Ferreira da Mata Cerqueira, Queila Oliveira dos Santos, Sulene Alves Araujo
MICROCHEMICAL JOURNAL
(2020)
Article
Chemistry, Analytical
Vanessa de Jesus Ferreira, Jorge S. Almeida, Valfredo A. Lemos, Olivia M. C. de Oliveira, Karina S. Garcia, Leonardo S. G. Teixeira
Summary: A method combining RP-VALLME and EDXRF was developed for the determination of Cu, Mn, Ni, and Pb in diesel oil samples, showing low detection limits, good precision, and high recovery rates. This method proved to be efficient and comparable to ICP-OES for the analysis of the four analytes.
Article
Chemistry, Analytical
Leane Santos Nunes, Maria Gracas Andrade Korn, Valfredo Azevedo Lemos
Summary: A method based on direct-immersion single-drop microextraction was developed for the determination of vanadium in water. The extraction solvent used was the ionic liquid [C6MIM][PF6], and digital images obtained directly from the solvent drop were used for detection. This method showed high sensitivity and accuracy, with minimal sample volume and waste generation, aligning with the principles of green chemistry.
Article
Biotechnology & Applied Microbiology
Ohana Nadine de Almeida, Rebeca Moraes Menezes, Leane Santos Nunes, Valfredo Azevedo Lemos, Francisco Heriberto Martinez Luzardo, Fermin Garcia Velasco
Summary: This study focuses on the Eichornia crassipes plant leaves, transforming them into a solid phase for the determination of lead (II) using flame atomic absorption spectrometry online method. The developed method is a simple, fast, economical, safe, and eco-friendly alternative for lead (II) determination.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Chemistry, Applied
Joabes Santos Trindade, Valfredo Azevedo Lemos, Uillian Mozart Ferreira Mata Cerqueira, Cleber Galvao Novaes, Sulene Alves Araujo, Marcos Almeida Bezerra
Summary: In this study, multivariate methodologies were employed to optimize a DLLME method for the determination of Cu and Mn in coconut water samples, achieving satisfactory analytical characteristics.
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
Luana Bastos Santos, Rosivan dos Santos de Assis, Uneliton Neves Silva, Valfredo Azevedo Lemos
Summary: An on-line system using switchable-hydrophilicity solvent-based liquid-phase microextraction for the determination of cobalt in various samples is described in this work. The method is efficient with a detection limit of 0.8 μg L-1 and an enrichment factor of 41. It shows good precision and accuracy when tested with certified reference material. The system is presented as a green and accessible alternative for cobalt determination in analyzed samples.
Review
Chemistry, Analytical
Luana Bastos Santos, Rosivan Santos Assis, Jeferson Alves Barreto, Marcos Almeida Bezerra, Cleber Galvao Novaes, Valfredo Azevedo Lemos
Summary: In recent years, there has been a significant increase in the search for green chemistry principles in analytical methods. Solvents play a crucial role in green analytical chemistry, and certain criteria must be met for a solvent to be considered green, including availability, low toxicity, biodegradability, and low cost. However, the availability of green solvents is currently limited. Deep eutectic solvents (DESs) have emerged as a new and promising alternative to traditional solvents, attracting attention for their eco-friendly, inexpensive, and easily obtainable characteristics. This work provides a critical review of the use of DESs in liquid-phase microextraction (LPME) and their contributions to green chemistry.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Luana B. Santos, Valfredo A. Lemos
Summary: A sensitive method employing vortex-assisted ionic liquid-based liquid-phase microextraction and digital imaging colorimetry is proposed for the determination of antimony species. The method allows for direct determination of Sb-III and measurement of Sb-V by converting it to reduced species. It offers low detection limits, high enrichment factors, and shows good application results in river water and mineral water samples.
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Adilson S. Santos, Tereza S. M. Santos, Valfredo A. Lemos, Alexilda O. de Souza
Summary: The study aimed to develop a low-cost and eco-friendly adsorbent from agro-industrial waste for the removal of hexavalent chromium. The adsorbent showed promising potential with a high adsorption capacity and may be a viable and efficient alternative for treating industrial effluents containing trace elements.
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Analytical
Vanessa Jesus Ferreira, Marina Santos de Jesus, Mayara Costa dos Santos, Wesley N. Guedes, Valfredo A. Lemos, Cleber G. Novaes, Floriatan Santos Costa, Clissiane S. Viana Pacheco, Erik Galvao Paranhos da Silva, Fabio Alan Carqueija Amorim
Summary: A cadmium determination method based on USAEME combined with FAAS was developed in this study, with optimized parameters such as the composition of extraction and dispersive solvents, volume of extraction solvent, pH, and sonication time. The method proved to be simple, fast, and efficient for cadmium determination with small amounts of organic solvents.
ANALYTICAL METHODS
(2021)
Article
Food Science & Technology
Jorge S. Almeida, Lucilia A. Meira, Ana D. S. Nascimento, Gabriel L. Santos, Valfredo A. Lemos, Leonardo S. G. Teixeira
Summary: A novel ultrasound-assisted dispersive liquid-liquid microextraction method was proposed for the determination of Cd, Cu, and Fe in margarine samples. The use of an ultrasonic bath assisted in increasing extraction efficiency, with subsequent determination using HR-CS ET AAS. The method showed promising results with low detection limits and recovery rates for the analyzed elements.
FOOD ANALYTICAL METHODS
(2021)
