Volume: 11

Issue: 44


This is a Special Issue celebrating the 20th Brazilian Meeting of Analytical Chemistry (ENQA). It contains an Editorial by Dr. Érico Flores, Dr. Márcia Mesko and Dr. Renato Zanella, Guest Editors of this special issue, an Interview with Dr. Carla Bottoli, a Point of View by Dr. Ralph E. Sturgeon, a Letter by Dr. Ewa Bulska, and 08 Articles. In addition, readers will find features on scientific meetings, sponsor reports & releases, book notices, and a calendar of events.

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Brazilian Meeting on Analytical Chemistry: Twenty Editions of High-Level Analytical Chemistry

Prof. Dr. Érico M. M. Flores
Full Professor, Federal University of Santa Maria, RS, Brazil
Prof. Dr. Márcia F. Mesko
Full professor, Federal University of Pelotas, RS, Brazil
Prof. Dr. Renato Zanella
Full Professor, Federal University of Santa Maria, RS, Brazil

“… as guest editors of this special BrJAC issue, we are glad to see many exciting new articles by researchers showing that the ENQA is a powerful meeting for changing and following new trends in the field and opening another door for spreading research results at a high level.”

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Professor Carla Bottoli, an enthusiastic scientific researcher, kindly spoke to BrJAC

Prof. Dr. Carla B. G. Bottoli
Associate Professor at the Institute of Chemistry, University of Campinas, SP, Brazil

“What I say to young researchers is that a master's and doctoral education makes a difference in anyone's professional (and personal) life. Brazil needs qualified people, and we have many spaces to act. However, if they do not have job opportunities here in Brazil, look for opportunities outside of Brazil, but do not stop following your dreams of building a scientific career.”

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Point of View

Expanding Collaborations with Brazilian Scientists

Prof. Dr. Ralph E. Sturgeon
Emeritus Research Officer, Metrology Research Centre, National Research Council, Canada

“One aspect, always underscored, but by no means unique to analytical chemistry, has been the benefits arising from collaborations. Much of modern science has, by necessity, become multidisciplinary in efforts to tackle ever more complex issues, requiring unique (and often expensive) facilities frequently unavailable in a single laboratory, as well as expertise spanning multiple disciplines to ensure success.”

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From Afar and From the Inside: About the Importance of Ethics in the Global World of Science

Ewa Bulska

Full Professor of Analytical Chemistry and Director of Biological and Chemical Research Centre at the University of Warsaw, Poland

“From afar, that is, from my homeland, Poland, perhaps showing to some extent the point of view of a European; from the inside, that is, by being a regular visitor in Brazil and having many personal contacts with Brazilian analysts.”

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Chemical Speciation of Arsenic and Chromium in Seafood by LC-ICP-MS
Ívero Pita de Sá, Carlos Alberto da Silva, Ana Rita A. Nogueira

Two methods were developed for the As and Cr species determination in different kinds of seafood, exploring the LC-ICP-MS potential. The Doehlert matrix and Box-Behnken design defined the ideal extraction conditions for arsenic and chromium species. The trueness was evaluated using certified reference materials and addition and recovery procedures. An additional method was developed for the speciation of soluble Cr(III) and Cr(VI) in fish, bivalve mollusks, and shrimp samples by LC-ICP-MS.

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A Simple Approach for Fe Determination in Beer by using Dispersive Liquid-Liquid Microextraction and Flame Atomic Absorption Spectrometry
Maiuca Alberto Seco, Eliana Torres Freitas Larruscain, Jader Rodrigo Kappaun Silveira, Rochele Sogari Picoloto, Fabio Andrei Duarte

The present study aimed to develop a simple, fast, and low-cost method for subsequent Fe determination by F AAS after DLLME. Although in DLLME the use of an extraction solvent is mandatory (at least in theory), which is combined with a disperser solvent, in this work only the extraction solvent was used. For Fe extraction by DLLME, the type and volume of extraction solvent, sample volume, type of complexing agent, sample pH, salting out effect, and the number of washing cycles after extraction were evaluated. The proposed method showed suitable accuracy, precision and LOQ values.

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Development of a Modified Electrode with N-doped Carbon Dots for Electrochemical Determination of 17α-ethinylestradiol
Brenda Rafaela Lima Freire, Michael Douglas Santos Monteiro, Jonatas de Oliveira Souza Silva, José Fernando de Macedo, Eliana Midori Sussuchi

N-doped carbon dot nanoparticles (N-CD) were synthesized and characterized by absorption and emission spectroscopy in the ultraviolet and visible regions, electronic absorption spectroscopy in the infrared region, and Raman Spectroscopy, which showed evidence of the formation of the material. Electrochemical analyses were conducted utilizing Differential Pulse Voltammetry (DPV). The electrode modified with N-CD had good electrochemical characteristics for the determination of the analyte in aqueous solutions.

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Degradation of the Micropollutant Amoxicillin using Enzymatic Treatment and Evaluation of Resulting Byproducts
Gabriela Vettorello, Lucas Schmidt, Daniel Kuhn, Bruno Eduardo da Silva, Ani Caroline Weber, Sabrina G. Cordeiro, Guilherme S. Henn, Bruna Costa, Jéssica S. H. dos Santos, Joana E. Willrich, Cristiano A. Pereira, Alexandre Rieger, Clarice Steffens, Eduardo M. Ethur, Elisete M. de Freitas, Lucélia Hoehne

The present study aimed to evaluate the enzymatic degradation of amoxicillin in water using an enzymatic treatment followed by analysis of byproduct formation and toxicity assessment, ensuring safe treatments to improve water quality. The results showed around 50% degradation of the drug, and byproducts originating from amoxicillin were identified. Toxicological tests indicated that the byproducts were minimally toxic to the microcrustacean, highlighting the importance of evaluating the safety of proposed treatments.

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Determination of Abamectin in Soybean Roots by Liquid Chromatography Coupled to Tandem Mass Spectrometry
Eliezer de Oliveira, Bianca Ferreira da Silva, Carla Beatriz Grespan Bottoli

An LC-MS/MS method employing QuEChERS for sample preparation was developed for the analysis of abamectin in soybean roots after foliar spray application. The method was validated, and the performance characteristics were acceptable. Matrix-matched calibration enabled compensation of the matrix effect and ensured accurate quantifications. The trueness and precision of the method were adequate. The method was applied to the determination of abamectin in the soybean roots and all the samples were free of abamectin, at least above the detection limit. This method provides a strategy to study the translocation of abamectin in soybean plants.

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Determination of Basic Nitrogen Content in Diesel Oil: A Miniaturized Method by Digital Image-Based Colorimetry in a Portable Device
Gabrielle Dineck Iop, Alice Penteado Holkem, Andres Castro de Souza, Edson Irineu Müller, Juliano Smanioto Barin, Paola de Azevedo Mello

The objective of this work was the development of a miniaturized protocol based on colorimetry with digital images in a portable device for determining the basic nitrogen content in diesel oil without sample preparation, with minimum consumption of reagents and simple instrumentation. A homemade 3D-printed chamber with controlled light intensity equipped with an USB camera was used for image acquisition after an acid-base titration reaction, carried out in a miniaturized device. The method developed showed to be suitable to use in routine laboratories, besides the feasibility of use a low-cost system combined with the aspects of green chemistry. The proposed approach could be easily implemented in refineries' quality control laboratories and might contribute to the advances in fuel characterization.

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Mineral Composition of Rice, Carrots, and Chayote after Microwave-Assisted Decomposition using Diluted Nitric Acid
Wellen Karen Marcelino Serafim, Briyitte Sofia Salazar Torres, Taciana Holanda Kunst, Alanna Letícia Sena do Nascimento, Iago José Santos da Silva, Marisilda de Almeida Ribeiro, Ana Paula Silveira Paim

In this work, a method of digestion of rice, carrots and chayote was proposed to determine the multi-elemental composition of these foods. It was possible to define a mineral composition for these foods before and after cooking. This method allowed a fast and efficient digestion of the samples, followed by the quantification of the analytes by ICP OES. Through this method, it was possible to assess that cooking food is a possible factor in increasing the concentration of aluminum, cadmium and chromium metals, as well as promoting nutritional losses.

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Ultrasound-assisted Extraction Method for Element Determination in Lignocellulosic Biomass
Karen Giacobe, Débora Pereira de Almeida, Samuel Rodrigo Waechter, Fabio Andrei Duarte, Cezar Augusto Bizzi

In this work, the use of ultrasound assisted extraction (UAE) for the elements extraction from biomasses considered as feedstock or industrial wastes and further determination by ICP OES was investigated, providing useful information for process monitoring, quality control and waste management. UAE was evaluated for elements extraction from lignocellulose biomass samples, where acoustic and extraction parameters as US frequency, acoustic amplitude, extraction solution, time, and temperature were evaluated. The proposed UAE method used diluted reagents, short extraction times, and milder extraction temperature. The results obtained in the proposed UAE method were compared with those obtained using EN ISO 16967.

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The 20th ENQA and 8th CIAQA Brought Together Researchers to Discuss Innovations in Analytical

For the second time at ENQA & CIAQA, there was a session dedicated to women entitled, “Women in Analytical Chemistry”, which was attended by more than 500 people. Topics covered included the panorama of female participation in analytical chemistry research in the different regions of Brazil, the challenges faced by women in this area, and examples of their success.

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The 47th RASBQ discussed the theme "The Centrality of Chemistry in the Education of Citizens and in Scientific and Technological Innovation

A highlight of the event was the thematic session, “Plastic pollution: different perspectives, different solutions, a single crisis”, coordinated by Prof. Dr. Walter Waldman (UFSCar) and Prof. Dr. Cassiana Montagner (Unicamp). Guests included Camila Barcellos, MSc (ABIQUIM), who presented the view of industry on plastic pollution and its solutions; Francisco Linhares Junior (from the Ministry of Foreign Affairs), who presented the Brazilian government’s view on plastic pollution and its solutions; and finally, Prof. Dr. Alexander Turra from USP and Coordinator of the UNESCO Chair on Ocean Sustainability, who spoke about the impact of plastic pollution, especially in aquatic environments.

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Sponsor Reports

AOF by combustion IC – non-targeted complemental determination of PFAS in aqueous samples
Eleonora von Abercron, Udo Neist, Inge Klocke, Dr. Sebastian Georgii, Prof. Dr. Hubertus Brunn – Hessian State Laboratory, Wiesbaden, Germany
Dr. Detlef Jensen – Thermo Fisher Scientific GmbH, Dreieich, Germany

The goal of this study was to develop an automated method to determine a range of perfluorinated alkyl substances (PFAS) by combustion IC within environmentally relevant matrices and compare the results with existing highly specific methods based on LC-MS/MS.

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Quantitative Comparison of Hormones in Drinking Water Between MS/MS and Orbitrap Technology
Ali Haghani and Andy Eaton – Eurofins Eaton Analytical, Inc. Monrovia, CA
Richard F. Jack, Claudia P.B. Martins, and Dipankar Ghosh – Thermo Fisher Scientific, San Jose, CA

The goal of this study was to demonstrate a LC-HRAM methodology using Orbitrap™ technology as a sensitive, accurate, and reliable alternative to the use of triple quadrupoles mass spectrometers in the quantification of hormones in drinking water according to EPA guidelines.

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New Performance for High Volume Agriculture Laboratories

Milestone’s ETHOS UP equipped with the MAXI 24 High Performance (HP) rotor incorporates all of the benefits of closed vessel microwave digestion while making sample preparation fast, easy, effective, and of the highest quality. This innovative solution perfectly integrates with the powerfull ETHOS UP, matching both performance and throughput requirements of agricultural elemental analysis.

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Sponsor Releases

Dionex™ ICS-6000 Standard Bore and Microbore HPIC™ Systems

Get significant increases in resolution and throughput using the world's first modular ion chromatography (IC) system capable of operation up to 5000 psi. It is a truly modular, highly configurable, high-performance system. As a top-of-the line ion chromatography system, it is designed for users who want to push the boundaries of what is possible in ion analysis.

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Leading performance – Orbitrap Exploris 240 mass spectrometer

Designed into our fourth-generation quadrupole-Orbitrap mass spectrometer, the Exploris™ 240 delivers the performance and versatility needed to drive discovery and identification with the quantitative precision and accuracy to confidently scale up while achieving impact. Operational simplicity with intelligent data acquisition helps you discover your fast track to confident results across a range of applications.

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ETHOS UP High Performance Microwave Digestion System

Quality Analysis Starts with Great Sample Prep. The ETHOS UP™ fully embodies Milestone’s philosophy in microwave sample preparation. Specifically designed for closed vessel microwave acid digestion, it offers productivity, safety, ease of use, connectivity, expertise and application flexibility.

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Pittcon Conference & Expo

Pittcon is a friendly, welcoming environment where analytical chemists at all professional levels meet. Pittcon is a platform for sharing ideas and cooperating to form new ones. At Pittcon, you will find that spark that drives your research, your career, and above all, your scientific perspective forward.

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SelectScience® Pioneers online Communication and Promotes Scientific Success

SelectScience® informs through trusted lab product reviews, virtual events, thought-leading webinars, features on hot scientific topics, eBooks and more, independent online publisher SelectScience® provides scientists across the world with vital information about the best products and techniques to use in their work.

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CHROMacademy is the leading provider of eLearning for analytical science

For over 10 years, CHROMacademy has increased knowledge, efficiency and productivity across all applications of chromatography.

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