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Ott CE. Strategies for assessing the limit of detection in voltammetric methods: comparison and evaluation of approaches. Analyst 2024; 149:4295-4309. [PMID: 38990215 PMCID: PMC11300140 DOI: 10.1039/d4an00636d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/12/2024]
Abstract
The realm of analytical chemistry continues to struggle with defining and evaluating the limit of detection in analytical methods in the sense that a multitude of definitions, criteria, caveats, and methods have been proposed, developed, and adopted across disciplines. The last decade has seen a surge in the growth of electrochemical methods and studies in the field of forensic science and forensic chemistry. While many disciplines within forensic science have established method validation guidelines, the historical and current lack of electrochemical methods within forensic laboratories throughout the United States has left a major gap in knowledge, inhibiting the adoption and utilization of electrochemistry, which may serve as a powerful tool in many subdisciplines of forensics. As such, this work begins this discussion by focusing first on the limit of detection (LOD), with application toward both qualitative and quantitative methods. Both inorganic (ferrocyanide and lead) and organic (diphenylamine, naltrexone, and acetaminophen) target analytes were analyzed via two common voltammetry methods: cyclic voltammetry and square-wave voltammetry. The LOD for each analyte was estimated and/or calculated following a variety of literature-described methods and compared. The accuracy and reliability of these LOD characteristics based on the experimental data is described herein along with suggestions and recommendations. This manuscript is intended to compare the resulting LOD values from various methods and provide a starting point for the incorporation of electrochemistry into the forensic science laboratory, beginning a focused discussion on the development of validation guidelines and parameters needed for the adoption of this technology in forensic laboratories in order to meet the standards required by the criminal justice system.
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Affiliation(s)
- Colby E Ott
- National Institute of Standards and Technology, USA.
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Castro SVF, Pereira JFS, Souza MMC, Siqueira GP, Santana MHP, Richter EM, Munoz RAA. Rapid sequential determination of the explosives 2,4,6-trinitrotoluene and cyclotrimethylenetrinitramine in forensic samples employing a graphite sheet sensor and cyclic square-wave stripping voltammetry. Mikrochim Acta 2024; 191:396. [PMID: 38877161 DOI: 10.1007/s00604-024-06461-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 05/24/2024] [Indexed: 06/16/2024]
Abstract
The development of a portable analytical procedure is described for rapid sequential detection and quantification of the explosives 2,4,6-trinitrotoluene (TNT) and cyclotrimethylenetrinitramine (RDX) in forensic samples using a graphite sheet (GS). A single GS platform works as a collector of explosive residues and detector after its assembly into a 3D-printed cell. The detection strategy is based on cyclic square-wave stripping voltammetry. The cathodic scan from + 0.1 to -1.0 V with accumulation at 0.0 V enables the TNT detection (three reduction peaks), and the anodic scan from + 0.2 to + 1.55 V with accumulation at -0.9 V provides the RDX detection (two oxidation processes). Low detection limit values (0.1 µmol L-1 for TNT and 2.4 µmol L-1 for RDX) and wide linear ranges (from 1 to 150 µmol L-1 for TNT and from 20 to 300 µmol L-1 for RDX) were obtained. The sensor did not respond to pentaerythritol tetranitrate (PETN), which was evaluated as a potential interferent, because plastic explosives contain mixtures of TNT, RDX, and PETN. The GS electrode was also evaluated as a collector of TNT and RDX residues spread on different surfaces to simulate forensic scenarios. After swiping over different surfaces (metal, granite, wood, cloths, hands, money bills, and cellphone), the GS electrode was assembled in the 3D-printed cell ready to measure both explosives by the proposed method. In all cases, the presence of TNT and RDX was confirmed, attesting the reliability of the proposed device to act as collector and sensor.
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Affiliation(s)
- Sílvia V F Castro
- Chemistry Institute, Federal University of Uberlândia, Uberlândia, 38400-902, MG, Brazil
| | - Jian F S Pereira
- Chemistry Institute, Federal University of Uberlândia, Uberlândia, 38400-902, MG, Brazil
| | - Maria M C Souza
- Chemistry Institute, Federal University of Uberlândia, Uberlândia, 38400-902, MG, Brazil
| | - Gilvana P Siqueira
- Chemistry Institute, Federal University of Uberlândia, Uberlândia, 38400-902, MG, Brazil
| | - Mário H P Santana
- Forensic Laboratory of the Federal Police, Uberlândia, 38408-663, MG, Brazil
| | - Eduardo M Richter
- Chemistry Institute, Federal University of Uberlândia, Uberlândia, 38400-902, MG, Brazil
| | - Rodrigo A A Munoz
- Chemistry Institute, Federal University of Uberlândia, Uberlândia, 38400-902, MG, Brazil.
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de Faria LV, Macedo AA, Arantes LC, Matias TA, Ramos DLO, Richter EM, Dos Santos WTP, Muñoz RAA. Novel disposable and portable 3D-printed electrochemical apparatus for fast and selective screening of 25E-NBOH in forensic samples. Talanta 2024; 269:125476. [PMID: 38042144 DOI: 10.1016/j.talanta.2023.125476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 11/20/2023] [Accepted: 11/22/2023] [Indexed: 12/04/2023]
Abstract
The advent of new psychoactive substances (NPS) has caused enormous difficulty for legal control since they are rapidly commercialized, and their chemical structures are routinely altered. In this aspect, derivatives phenethylamines, such as 25E-NBOH, have received great attention in the forensic scenario. Hence, we propose portable and cost-effective (U$ 5.00) 3D-printed devices for the electrochemical screening of 25E-NBOH for the first time. The cell and all electrodes were printed using acrylonitrile butadiene styrene filament (insulating material) and conductive filament (graphite embedded in a polylactic acid matrix), respectively, both by the fused deposition modeling (FDM) 3D printing technique. The electrochemical apparatus enables micro-volume analysis (50-2000 μL), especially important for low sample volumes. A mechanistic route for the electrochemical oxidation of 25E-NBOH is proposed based on cyclic voltammetric data, which showed two oxidation processes around +0.75 V and +1.00 V and a redox pair between +0.2 and -0.2 V (vs. graphite ink pseudo-reference). A fast and sensitive square-wave voltammetry method was developed, which exhibited a linear working range from 0.85 to 5.1 μmoL-1, detection limit of 0.2 μmol L-1, and good intra-electrode precision (n = 10, RSD <5.3 %). Inter-electrode measurements (n = 3, RSD <9.8 %) also attested that the electrode production process is reproducible. Interference tests in the presence of other drugs frequently found in blotting paper indicated high selectivity of the electrochemical method for screening of 25E-NBOH. Screening analysis of blotting paper confirmed the presence of 25E-NBOH in the seized samples. Moreover, a recovery percentage close to 100 % was found for a spiked saliva sample, suggesting the method's usefulness for quantitative purposes aimed at information on recent drug use.
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Affiliation(s)
- Lucas V de Faria
- Institute of Chemistry, Federal University of Uberlândia, Uberlândia, MG, 38400-902, Brazil; Department of Analytical Chemistry, Institute of Chemistry, Fluminense Federal University, 24020-141, Niterói, RJ, Brazil.
| | - Anne A Macedo
- Department of Chemistry, Federal University of the Jequitinhonha and Mucuri, Diamantina, MG, 39100-000, Brazil
| | - Luciano C Arantes
- Forensic Chemistry and Physics Laboratory, Institute of Forensic Science, Civil Police of the Brazilian Federal District, Brasília, DF, 70610-907, Brazil
| | - Tiago A Matias
- Institute of Chemistry, Federal University of Uberlândia, Uberlândia, MG, 38400-902, Brazil; Chemistry Department, Federal University of Espírito Santo - UFES, 29075-910, Vitória, ES, Brazil
| | - David L O Ramos
- Institute of Chemistry, Federal University of Uberlândia, Uberlândia, MG, 38400-902, Brazil
| | - Eduardo M Richter
- Institute of Chemistry, Federal University of Uberlândia, Uberlândia, MG, 38400-902, Brazil; National Institute of Science and Technology in Bioanalytics (INCT-Bio), Campinas, SP, Brazil
| | - Wallans T P Dos Santos
- Department of Pharmacy, Federal University of the Jequitinhonha and Mucuri, Diamantina, MG, 39100-000, Brazil
| | - Rodrigo A A Muñoz
- Institute of Chemistry, Federal University of Uberlândia, Uberlândia, MG, 38400-902, Brazil; National Institute of Science and Technology in Bioanalytics (INCT-Bio), Campinas, SP, Brazil.
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Huang Z, Song H, Feng L, Qin J, Wang Q, Guo B, Wei L, Lu Y, Guo H, Zhu D, Ma X, Guo Y, Zheng H, Li M, Su Z. A novel ultrasensitive electrochemical sensor based on a hybrid of rGO/MWCNT/AuNP for the determination of lead(II) in tea drinks. Microchem J 2022. [DOI: 10.1016/j.microc.2022.108346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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de Faria LV, Rocha RG, Arantes LC, Ramos DL, Lima CD, Richter EM, P dos Santos WT, Muñoz RA. Cyclic square-wave voltammetric discrimination of the amphetamine-type stimulants MDA and MDMA in real-world forensic samples by 3D-printed carbon electrodes. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Stefano JS, Kalinke C, da Rocha RG, Rocha DP, da Silva VAOP, Bonacin JA, Angnes L, Richter EM, Janegitz BC, Muñoz RAA. Electrochemical (Bio)Sensors Enabled by Fused Deposition Modeling-Based 3D Printing: A Guide to Selecting Designs, Printing Parameters, and Post-Treatment Protocols. Anal Chem 2022; 94:6417-6429. [PMID: 35348329 DOI: 10.1021/acs.analchem.1c05523] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The 3D printing (or additive manufacturing, AM) technology is capable to provide a quick and easy production of objects with freedom of design, reducing waste generation. Among the AM techniques, fused deposition modeling (FDM) has been highlighted due to its affordability, scalability, and possibility of processing an extensive range of materials (thermoplastics, composites, biobased materials, etc.). The possibility of obtaining electrochemical cells, arrays, pieces, and more recently, electrodes, exactly according to the demand, in varied shapes and sizes, and employing the desired materials has made from 3D printing technology an indispensable tool in electroanalysis. In this regard, the obtention of an FDM 3D printer has great advantages for electroanalytical laboratories, and its use is relatively simple. Some care has to be taken to aid the user to take advantage of the great potential of this technology, avoiding problems such as solution leakages, very common in 3D printed cells, providing well-sealed objects, with high quality. In this sense, herein, we present a complete protocol regarding the use of FDM 3D printers for the fabrication of complete electrochemical systems, including (bio)sensors, and how to improve the quality of the obtained systems. A guide from the initial printing stages, regarding the design and structure obtention, to the final application, including the improvement of obtained 3D printed electrodes for different purposes, is provided here. Thus, this protocol can provide great perspectives and alternatives for 3D printing in electroanalysis and aid the user to understand and solve several problems with the use of this technology in this field.
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Affiliation(s)
- Jéssica Santos Stefano
- Department of Nature Sciences, Mathematics and Education, Federal University of São Carlos, 13600-970, Araras, São Paulo, Brazil
| | - Cristiane Kalinke
- Institute of Chemistry, University of Campinas, 13083-859, Campinas, São Paulo, Brazil
| | - Raquel Gomes da Rocha
- Institute of Chemistry, Federal University of Uberlândia, 38400-902, Uberlândia, Minas Gerais, Brazil
| | - Diego Pessoa Rocha
- Institute of Chemistry, Department of Fundamental Chemistry, University of São Paulo, 05508-000, São Paulo, São Paulo, Brazil.,Department of Chemistry, Federal Institute of Paraná, 85200-000, Pitanga, Paraná, Brazil
| | | | - Juliano Alves Bonacin
- Institute of Chemistry, University of Campinas, 13083-859, Campinas, São Paulo, Brazil
| | - Lúcio Angnes
- Institute of Chemistry, Department of Fundamental Chemistry, University of São Paulo, 05508-000, São Paulo, São Paulo, Brazil
| | - Eduardo Mathias Richter
- Institute of Chemistry, Federal University of Uberlândia, 38400-902, Uberlândia, Minas Gerais, Brazil
| | - Bruno Campos Janegitz
- Department of Nature Sciences, Mathematics and Education, Federal University of São Carlos, 13600-970, Araras, São Paulo, Brazil
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Comparing electrochemical pre-treated 3D printed native and mechanically polished electrode surfaces for analytical sensing. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2021.115994] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Whittingham MJ, Crapnell RD, Rothwell EJ, Hurst NJ, Banks CE. Additive manufacturing for electrochemical labs: An overview and tutorial note on the production of cells, electrodes and accessories. TALANTA OPEN 2021. [DOI: 10.1016/j.talo.2021.100051] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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Rocha DP, Rocha RG, Castro SVF, Trindade MAG, Munoz RAA, Richter EM, Angnes L. Posttreatment of 3D‐printed surfaces for electrochemical applications: A critical review on proposed protocols. ELECTROCHEMICAL SCIENCE ADVANCES 2021. [DOI: 10.1002/elsa.202100136] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- Diego P. Rocha
- Instituto de Química Universidade de São Paulo Sao Paulo Brazil
| | - Raquel G. Rocha
- Instituto de Química Universidade Federal de Uberlândia berlândia Brazil
| | | | - Magno A. G. Trindade
- Faculdade de Ciências Exatas e Tecnologia Universidade Federal da Grande Dourados Dourados Brazil
- UNESP Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT‐DATREM) National Institute for Alternative Technologies of Detection Institute of Chemistry Araraquara Brazil
| | | | - Eduardo M. Richter
- Instituto de Química Universidade Federal de Uberlândia berlândia Brazil
| | - Lucio Angnes
- Instituto de Química Universidade de São Paulo Sao Paulo Brazil
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João AF, Rocha RG, Matias TA, Richter EM, Flávio S. Petruci J, Muñoz RA. 3D-printing in forensic electrochemistry: Atropine determination in beverages using an additively manufactured graphene-polylactic acid electrode. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106324] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Abdalla A, Patel BA. 3D Printed Electrochemical Sensors. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2021; 14:47-63. [PMID: 33974807 DOI: 10.1146/annurev-anchem-091120-093659] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Three-dimensional (3D) printing has recently emerged as a novel approach in the development of electrochemical sensors. This approach to fabrication has provided a tremendous opportunity to make complex geometries of electrodes at high precision. The most widely used approach for fabrication is fused deposition modeling; however, other approaches facilitate making smaller geometries or expanding the range of materials that can be printed. The generation of complete analytical devices, such as electrochemical flow cells, provides an example of the array of analytical tools that can be developed. This review highlights the fabrication, design, preparation, and applications of 3D printed electrochemical sensors. Such developments have begun to highlight the vast potential that 3D printed electrochemical sensors can have compared to other strategies in sensor development.
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Affiliation(s)
- Aya Abdalla
- Centre for Stress and Age-Related Disease, University of Brighton, Brighton BN2 4GJ, United Kingdom; ,
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton BN2 4GJ, United Kingdom
| | - Bhavik Anil Patel
- Centre for Stress and Age-Related Disease, University of Brighton, Brighton BN2 4GJ, United Kingdom; ,
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton BN2 4GJ, United Kingdom
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Silva AL, Salvador GMDS, Castro SVF, Carvalho NMF, Munoz RAA. A 3D Printer Guide for the Development and Application of Electrochemical Cells and Devices. Front Chem 2021; 9:684256. [PMID: 34277568 PMCID: PMC8283263 DOI: 10.3389/fchem.2021.684256] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 05/31/2021] [Indexed: 12/12/2022] Open
Abstract
3D printing is a type of additive manufacturing (AM), a technology that is on the rise and works by building parts in three dimensions by the deposit of raw material layer upon layer. In this review, we explore the use of 3D printers to prototype electrochemical cells and devices for various applications within chemistry. Recent publications reporting the use of Fused Deposition Modelling (fused deposition modeling®) technique will be mostly covered, besides papers about the application of other different types of 3D printing, highlighting the advances in the technology for promising applications in the near future. Different from the previous reviews in the area that focused on 3D printing for electrochemical applications, this review also aims to disseminate the benefits of using 3D printers for research at different levels as well as to guide researchers who want to start using this technology in their research laboratories. Moreover, we show the different designs already explored by different research groups illustrating the myriad of possibilities enabled by 3D printing.
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Affiliation(s)
- Ana Luisa Silva
- Grupo de Catálise Ambiental e Sustentabilidade Energética, Instituto de Química, Departamento de Química Geral e Inorgânica, Universidade do Estado do Rio de Janeiro, Maracanã, Rio de Janeiro, Brazil
| | - Gabriel Maia da Silva Salvador
- Grupo de Catálise Ambiental e Sustentabilidade Energética, Instituto de Química, Departamento de Química Geral e Inorgânica, Universidade do Estado do Rio de Janeiro, Maracanã, Rio de Janeiro, Brazil
| | - Sílvia V F Castro
- Núcleo de Pesquisa em Eletroanalítica, Instituto de Química, Universidade Federal de Uberlândia, Uberlândia, Brazil
| | - Nakédia M F Carvalho
- Grupo de Catálise Ambiental e Sustentabilidade Energética, Instituto de Química, Departamento de Química Geral e Inorgânica, Universidade do Estado do Rio de Janeiro, Maracanã, Rio de Janeiro, Brazil
| | - Rodrigo A A Munoz
- Núcleo de Pesquisa em Eletroanalítica, Instituto de Química, Universidade Federal de Uberlândia, Uberlândia, Brazil
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Ferreira PA, de Oliveira FM, de Melo EI, de Carvalho AE, Lucca BG, Ferreira VS, da Silva RAB. Multi sensor compatible 3D-printed electrochemical cell for voltammetric drug screening. Anal Chim Acta 2021; 1169:338568. [PMID: 34088376 DOI: 10.1016/j.aca.2021.338568] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 04/16/2021] [Accepted: 04/21/2021] [Indexed: 02/06/2023]
Abstract
3D printing is a hot topic in electroanalytical chemistry, allowing the construction of custom cells and sensors at affordable prices. In this work, we describe a novel small and practical 3D-printed electrochemical cell. The cell's body, manufactured in ABS on a 3D printer, is composed by three parts easily screwed: solution vessel, stick and cover with two embedded 3D-pen-printed carbon black-polylactic acid (CB-PLA) electrodes (counter and pseudo-reference). The cell is compatible with any planar working electrode, in which boron-doped diamond, graphite sheet (GS) and 3D-printed CB-PLA were shown as examples. A new alternative protocol to quickly produce 3D-printed sensors using a 3D pen and other low-cost apparatus is also proposed. The voltammetric performance of each evaluated sensor was carried out in the presence of redox probe ferricyanide and paracetamol as model analyte, and the surfaces were characterized by electrochemical impedance spectroscopy and scanning electrochemical microscopy. To present an analytical application of the 3D-printed cell, low-cost flexible sensors (GS and CB-PLA) were used as integrated platforms for sampling and detection of solid drugs. As a proof-of-concept, traces of drugs with a historic of counterfeit or adulteration (sildenafil citrate, tadalafil, losartan and 17α-ethinylestradiol) were abrasively sampled over the sensor and assembled on 3D-printed cell to perform a fast voltammetric scan in the presence of only 500 μL of electrolyte. This protocol is attractive for pharmaceutical and forensic sciences as a simple preliminary screening method which could identify the presence or absence of the suspicious drug as well as impurities or adulterants. The 3D-printed cell was also used for the determination of 17α-ethinylestradiol in a contraceptive pill to demonstrate a quantitative analysis. The cell is quickly printed (90 min), cheap (US$ 0.30) and requires low electrolyte volumes (0.5-3.0 mL), being suitable to be used in several other electroanalyses, especially for on-site applications.
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Affiliation(s)
- Priscila Alves Ferreira
- Instituto de Química, Universidade Federal de Mato Grosso Do Sul, 79074-460, Campo Grande, MS, Brazil
| | | | - Edmar Isaias de Melo
- Instituto de Química, Universidade Federal de Uberlândia, 38500-000, Monte Carmelo, MG, Brazil
| | - Adriana Evaristo de Carvalho
- Faculdade de Ciências Exatas e Tecnológicas, Universidade Federal da Grande Dourados, 79804-970, Dourados, MS, Brazil
| | - Bruno Gabriel Lucca
- Instituto de Química, Universidade Federal de Mato Grosso Do Sul, 79074-460, Campo Grande, MS, Brazil
| | - Valdir Souza Ferreira
- Instituto de Química, Universidade Federal de Mato Grosso Do Sul, 79074-460, Campo Grande, MS, Brazil
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Rocha RG, Ribeiro JS, Santana MHP, Richter EM, Muñoz RAA. 3D-printing for forensic chemistry: voltammetric determination of cocaine on additively manufactured graphene-polylactic acid electrodes. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:1788-1794. [PMID: 33885677 DOI: 10.1039/d1ay00181g] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Cocaine is probably one of the most trafficked illicit drugs in the world. For this reason, police forces require fast, selective, and sensitive methods for cocaine detection at crime scenes. Taking benefit of additive manufacturing, we demonstrate that 3D-printed graphene-polylactic acid (G-PLA) electrodes using the affordable fused deposition modelling technique can identify and quantify cocaine in seized drugs. The detection of cocaine based on its electrochemical oxidation on such electrodes was dramatically improved after an electrochemical surface treatment that generates reduced graphene oxide (anodic followed by a cathodic treatment). Square-wave voltammetric determination of cocaine was achieved in the concentration range between 20 and 100 μmol L-1, with a detection limit of 6 μmol L-1, and free from the interference of paracetamol, caffeine, phenacetin, lidocaine, benzocaine and levamisole, which are common adulterants found in seized drugs. The analytical characteristics obtained using 3D-printed G-PLA electrodes were comparable with those of previously reported electrochemical sensors, but presented the inherent advantages of the 3D-printing technology that enables low-cost, reproducible, and large-scale production of such electrodes in remote areas combined with the use of an environmentally-friendly biopolymer.
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Affiliation(s)
- Raquel G Rocha
- Institute of Chemistry, Federal University of Uberlândia, 38408-100 Uberlândia, MG, Brazil.
| | - Julia S Ribeiro
- Institute of Chemistry, Federal University of Uberlândia, 38408-100 Uberlândia, MG, Brazil.
| | - Mário H P Santana
- Unidade Técnico-Científica, Superintendência Regional da Polícia Federal em MG, 38408-680, Uberlândia, Minas Gerais, Brazil
| | - Eduardo M Richter
- Institute of Chemistry, Federal University of Uberlândia, 38408-100 Uberlândia, MG, Brazil.
| | - Rodrigo A A Muñoz
- Institute of Chemistry, Federal University of Uberlândia, 38408-100 Uberlândia, MG, Brazil.
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Βaltima A, Panagopoulou H, Economou A, Kokkinos C. 3D-printed fluidic electrochemical microcell for sequential injection/stripping analysis of heavy metals. Anal Chim Acta 2021; 1159:338426. [PMID: 33867040 DOI: 10.1016/j.aca.2021.338426] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 03/05/2021] [Accepted: 03/16/2021] [Indexed: 12/21/2022]
Abstract
In this paper, a 3D-printed microfluidic device is described which is suitable for sequential injection/anodic stripping voltammetric (SIA-ASV) determination of Pb(II) and Cd(II). The fluidic device is manufactured by 3D-printing in a single-step using a dual extruder 3D printer. The device is composed of a microfluidic cell (printed from a non-conductive polylactic acid (PLA) filament) and of 3 electrodes (printed from a conductive carbon-loaded PLA filament) which are integrated within the fluidic cell. During the preconcentration step, a zone of the sample (containing the target cations) and a zone of Bi(III) solution are mixed on-line and the cations are reduced on the working electrode forming a bismuth alloy. The detection step involves a voltametric scan in static solution, in which the accumulated metals are oxidized while the oxidation current is monitored. After the optimization of the relevant parameters, the limit of detection is 0.38 μg L-1 for Pb(II) and 0.57 μg L-1 for Cd(II), while the within-device repeatability and the between-device reproducibility are lower than 4.5% (n = 8) and 9% (n = 6), respectively, for both cations at the 30 μg L-1 level. The device was successfully applied to the simultaneous determination of Pb(II) and Cd(II) in a honey sample.
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Affiliation(s)
- Anastasia Βaltima
- Laboratory of Analytical Chemistry, Department of Chemistry, University of Athens, Athens, 157 71, Greece
| | - Heleni Panagopoulou
- Laboratory of Analytical Chemistry, Department of Chemistry, University of Athens, Athens, 157 71, Greece
| | - Anastasios Economou
- Laboratory of Analytical Chemistry, Department of Chemistry, University of Athens, Athens, 157 71, Greece
| | - Christos Kokkinos
- Laboratory of Analytical Chemistry, Department of Chemistry, University of Athens, Athens, 157 71, Greece.
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Bessa BGDO, Silva-Neto HDA, Coltro WKT, Rocha TL, Lopes WR. Lead toxicity in Lucilia cuprina and electrochemical analysis: a simple and low-cost alternative for forensic investigation. Anal Bioanal Chem 2021; 413:3201-3208. [PMID: 33665673 DOI: 10.1007/s00216-021-03257-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Revised: 02/24/2021] [Accepted: 02/26/2021] [Indexed: 11/29/2022]
Abstract
Entomotoxicology allows the detection and analysis of substances such as poisons, drugs, and metals in necrophagous insects using analytical protocols. In a forensic situation related to death by gunshot, the gunshot residue (GSR) is dispersed at the crime scene and may be consumed by necrophagous insects. Lead (Pb) is the most abundant metal in GSR samples and it can be determined using non-portable methods. However, the toxicity effects of GSR samples on Lucilia cuprina (Diptera: Calliphoridae) and the detection of Pb via portable electrochemical methods have not been investigated. This study describes for the first time the toxicity analysis of Pb on immature L. cuprina through their survival rate and influence of Pb on immature development. In addition, the bioaccumulation of Pb in the larvae samples was determined based on square wave anodic stripping voltammetry (SWASV) measurements. The results revealed a low limit of detection to Pb (6.5 μg L-1) and the analytical performance was satisfactory because it measures Pb levels in larvae exposed to a diet containing 50 μg Pb g-1. Furthermore, the levels of Pb influenced the survival rate and development time of the immature L. cuprina. Larvae exposed to a high concentration of the metal (50 μg Pb g -1) showed statistically significant changes (p < 0.05). The presence of Pb in immature L. cuprina can be used to estimate the post-mortem interval; thus, the present study provides important information in forensic entomology.
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Affiliation(s)
- Bárbara G de O Bessa
- Instituto de Ciências Biológicas, Universidade Federal de Goiás, Campus Samambaia, Goiânia, GO, 74690-900, Brazil
| | | | - Wendell K T Coltro
- Instituto de Química, Universidade Federal de Goiás, Goiânia, GO, 74690-900, Brazil
| | - Thiago L Rocha
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, GO, 74001-970, Brazil
| | - Welinton R Lopes
- Instituto de Ciências Biológicas, Universidade Federal de Goiás, Campus Samambaia, Goiânia, GO, 74690-900, Brazil
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Masac J, Machynak L, Lovic J, Beinrohr E, Cacho F. On-line electrochemical preconcentration and electrochemical hydride generation for determination of antimony by high-resolution continuum source atomic absorption spectrometry. Talanta 2021; 223:121767. [PMID: 33298277 DOI: 10.1016/j.talanta.2020.121767] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Revised: 10/06/2020] [Accepted: 10/08/2020] [Indexed: 11/30/2022]
Abstract
Trace concentrations of antimony in aquatic samples were determined by high resolution continuum-source atomic absorption spectrometry (HR-CS AAS) after electrochemical pre-concentration and electrochemical hydride generation. Antimony was electrochemically deposited in a microporous glassy carbon electrode as elemental antimony then was electrochemically converted at the same electrode surface to antimony hydride which was transported by argon gas to the quartz cuvette of the spectrometer. The detection limit and precision of the method are below 0.1 μg L-1 and 3-5%, respectively. The method was employed for the determination of antimony in a CRM and water samples including surface, underground and waste water.
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Affiliation(s)
- Jakub Masac
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinskeho 9, 812 37, Bratislava, Slovakia
| | - Lubomir Machynak
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinskeho 9, 812 37, Bratislava, Slovakia
| | - Jan Lovic
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinskeho 9, 812 37, Bratislava, Slovakia
| | - Ernest Beinrohr
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinskeho 9, 812 37, Bratislava, Slovakia
| | - Frantisek Cacho
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinskeho 9, 812 37, Bratislava, Slovakia.
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19
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Trends in Gunshot Residue Detection by Electrochemical Methods for Forensic Purpose. JOURNAL OF ANALYSIS AND TESTING 2021. [DOI: 10.1007/s41664-020-00152-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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