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21:24, sáb nov 2

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EDIÇÃO ATUAL vol. 46, No. 7, 2023



Artigo de Capa
Quim. Nova 2023, 46(7), 755-764

Uma tradução comentada do artigo "Ácidos e Bases" de Gilbert Newton Lewis

Regiane Lopes dos SantosI,*; Wellington Pereira de QueirósII; Fernando Cruvinel DamascenoIII; Leandro Nogueira BatistaIV

Gilbert N. Lewis (1875-1946) expanded knowledge of acid and base chemistry in the 20th century. In homage to his relevant work, we propose a commented translation of Acids and Bases (Lewis, 1938). In the article, through a simple and elegant combination of theoretical and experimental elements, he raised phenomenological characteristics of acids and bases.

http://dx.doi.org/10.21577/0100-4042.20230035

Publicado online: março 31, 2023
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Total access: 1214

Artigo de Contra Capa
Quim. Nova 2023, 46(7), 747-754

Principal component analysis (PCA) para a avaliação de dados químicos e geração de heat maps: um tutorial

Dennis da Silva FerreiraI; Leticia da Silva RodriguesII; Fabiola Manhas Verbi PereiraII; Edenir Rodrigues Pereira-FilhoI,*

Principal component analysis (PCA): exploratory analysis and data mining.

http://dx.doi.org/10.21577/0100-4042.20230030

Publicado online: março 8, 2023
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Total access: 1295

Artigo Quim. Nova 2023, 46(7), 683-690

 

Formaldehyde analysis by SPME on-fiber derivatization: a study of the kinetic models of adsorption for divinylbenzene

Stefano DugheriI,*; Giovanni CappelliII; Niccolò FanfaniIII; Jacopo CeccarelliII; Lucia TrevisaniII; Marco SartiIV; Donato SquillaciII; Elisabetta BucalettiII; Riccardo GoriV; Nicola MucciII; Giulio ArcangeliII


SPME on-fiber derivatization and subsequent exposition to the target analyte (i.e. formaldehyde). In this context, a study of the kinetic of the adsorption was investigated to estabilish the best sampling conditions.

http://dx.doi.org/10.21577/0100-4042.20230039

Publicado online: março 31, 2023
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Total access: 885

Quim. Nova 2023, 46(7), 691-697

 

Efeitos das múltiplas estruturas e da anarmonicidade torcional para as reações de abstração de hidrogênio no butanoato de metila pelo radical H

Joel Leitão Nascimento*; Tiago Vinicius Alves*


Multiple structures and torsional anharmonicity effects on the thermal rate constants.

http://dx.doi.org/10.21577/0100-4042.20230040

Publicado online: abril 5, 2023
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Total access: 579

Quim. Nova 2023, 46(7), 698-705

 

ATR-FTIR and UV-Vis as techniques for methanol analysis in biodiesel-washing wastewater

Tiago Gomes dos Santos*; Rúben Santana Ramos da Silva; Fabioney Garcia da Costa; Demétrio de Abreu Sousa


Methanol, present in effluents in the biodiesel industry, can become an environmental pollutant. A simple and low-cost approach was proposed to identify and quantify methanol in biodiesel-washing wastewater by exploring ATR-FTIR and UV-Vis spectroscopic methods.

http://dx.doi.org/10.21577/0100-4042.20230041

Publicado online: abril 6, 2023
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Total access: 820

Quim. Nova 2023, 46(7), 706-717

 

Gestão de resíduos nos laboratórios da Universidade de Évora (2007-2021)

Sofia CapeloI,II,*; Guilhermina SiqueniqueIII; João MorgadoIII


Laboratory waste management at the University of Évora was studied from 2007 to 2021 (15 years), including the years of the COVID-19 pandemic. Solutions were proposed to improve the management of laboratory waste.

http://dx.doi.org/10.21577/0100-4042.20230042

Publicado online: abril 6, 2023
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Total access: 609

Quim. Nova 2023, 46(7), 718-723

 

Bismuth-antimony film electrode for stripping voltammetric determination of trace cadmium and lead in Thai rice wine

Watsaka SiriangkhawutI,*; Kraingkrai PonhongI; Piyanete ChantiratikulI; Parita MayothaII


Stripping voltammetric analysis was proposed for determination of trace cadmium and lead in local rice wine samples using a bismuth-antimony film electrode (Bi-SbFE).

http://dx.doi.org/10.21577/0100-4042.20230043

Publicado online: abril 6, 2023
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Total access: 690

Revisão Quim. Nova 2023, 46(7), 724-730

 

Boas práticas sustentáveis de gestão de resíduos químicos em instituições públicas de ensino superior

Marcus Vinícius Carvalho ArantesI,*; Wanda Maria Risso GüntherII,*


Documentary review of this work brought together a series of Brazilian regulations applicable to the safe and sustainable management of chemical waste.

http://dx.doi.org/10.21577/0100-4042.20230034

Publicado online: março 29, 2023
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Total access: 723

Quim. Nova 2023, 46(7), 731-742

 

Transições eletrônicas em α-Fe2O3: modelos teóricos e limitações

Isabela F. S. Santos*; Dalva L. A. de Faria


Hematite finds a large range of applications, most of them due to its electronic transitions in the visible and low band gap. In this work the theoretical models used to assign such transitions and electronic structure are presented and critically reviewed.

http://dx.doi.org/10.21577/0100-4042.20230036

Publicado online: março 31, 2023
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Total access: 564

Nota Técnica Quim. Nova 2023, 46(7), 743-746

 

Rapid method for simultaneous determination of cis-9, trans-11 and trans-10, cis-12 conjugated linoleic acid isomers in milk by GC-FID

Brenda Lee Simas PortoI,II; Isaura Daniele Leite FariaI; Jéssica Cordeiro Queiroz de SouzaI; Olívia Brito de Oliveira MoreiraI; Marco Antônio Sundfeld da GamaIII; Marcone Augusto Leal de OliveiraI,IV,*


5-min-long GC-FID method for cis-9, trans-1 and trans-10, cis-12 CLA isomers analysis featuring SLB-IL111 ionic liquid column and isothermal runs that results in an enhanced analytical frequency for dairy quality control.

http://dx.doi.org/10.21577/0100-4042.20230026

Publicado online: março 2, 2023
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Total access: 595

On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
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