Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Leonardo Luiz Okumura"'
Autor:
Marcelo Firmino de Oliveira, Jacqueline Querino Alves, José Fernando de Andrade, Adelir Aparecida Saczk, Leonardo Luiz Okumura
Publikováno v:
Eclética Química, Vol 34, Iss 3, Pp 77-83 (2018)
The HPLC technique with UV-Vis detection was employed in the analysis of cocaine content in apprehended samples of cocaine and crack. A peak signal for cocaine was obtained in 3.5 minutes run by using acetonitrile/water (95:5v/v) as a mobile phase. O
Externí odkaz:
https://doaj.org/article/a136790e450142bbb2f92f3d1845b4fd
Autor:
Meilene Ribeiro Fidélis, Leonardo Luiz Okumura, Ástrea Filomena de Souza Silva, Alexandre Gurgel, Adelir Aparecida Saczk
Publikováno v:
The Journal of Engineering and Exact Sciences, Vol 2, Iss 3, Pp 171-189 (2016)
Qualitative electrochemical characterization of procymidone (PRO) and tebuthiuron (TBH) was carried out by cyclic voltammetry using a carbon paste electrode. The studies suggest that analyte mass transfer is controlled by diffusion, and that oxidatio
Externí odkaz:
https://doaj.org/article/6fc3dc12471b49c681934571bcb31086
Autor:
Izabel Cristina Eleotério, Marco Aantonio Balbino, José Fernando de Andrade, Bruno Ferreira, Adelir Aparecida Saczk, Leonardo Luiz Okumura, Antonio Carlos Ferreira Batista, Marcelo Firmino de Oliveira
Publikováno v:
Journal of Electrochemical Science and Engineering, Vol 8, Iss 4 (2018)
In this work a new model of carbon paste electrode was employed to determine sulfamethoxazole (SMX), an antibiotic used to treat infections in human and veterinary medicine, by the square wave voltammetric modality (SWV). More specifically, the elec
Externí odkaz:
https://doaj.org/article/3f605b2d5cc64a568474003680ac3aac
Autor:
Adriana Paiva de Oliveira, Leonardo Luiz Okumura, José Anchieta Gomes Neto, Mercedes de Moraes
Publikováno v:
Eclética Química, Vol 27, Iss 2 (2018)
The analyte additions method was applied for sodium determination in fuel ethanol by atomic emission spectrometry. Graphics involving emission intensity versus analyte concentration in the 0 – 0.300 mg Na L-1 interval concentration range contaning
Externí odkaz:
https://doaj.org/article/1e57b3cfd1ce41f1862441b383f57760
Autor:
Marcelo Firmino de Oliveira, Adelir Aparecida Saczk, Leonardo Luiz Okumura, Nelson Ramos Stradiotto
Publikováno v:
Eclética Química, Vol 27, Iss 2 (2018)
The presence of heavy metals in fuel ethanol is obtained in different steps as production and storage of ethanol, constituting an inorganic contamination. Quantitative analysis of these contaminants has been usually carried out by conventional techni
Externí odkaz:
https://doaj.org/article/fc6bebf6eaa7443eb2822be391fff2b3
Autor:
Adelir Aparecida Saczk, Marcelo Firmino de Oliveira, Leonardo Luiz Okumura, Nelson Ramos Stradiotto
Publikováno v:
Eclética Química, Vol 27, Iss 2 (2018)
This study reports the electrochemical behavior of 2-furfuraldehide reduction in ethanol using glassy carbon electrode, aiming to correlate adequate experimental conditions for determination of this 2-furfuraldehide in fuel ethanol. Obtained voltammo
Externí odkaz:
https://doaj.org/article/5a6f31f542d64227a15bf725f4358ec9
Autor:
Marco Antônio Balbino, Glauco Fiaschi, José Fernando de Andrade, Adelir Aparecida Saczk, Leonardo Luiz Okumura, Marcelo Firmino de Oliveira
Publikováno v:
Brazilian Journal of Forensic Sciences, Medical Law and Bioethics, Vol 1, Iss 2 (2012)
A comparative study between three automotive headlights (conventional, halogen, and HID lamp) using scanning electron microscopy coupled with energy dispersive spectrometry (SEM-EDS) is described. Results show the possibility of conducting topographi
Externí odkaz:
https://doaj.org/article/5ca556ac4aff4d83866d775c14b4d95c
Autor:
Priscila A. Liberato, Leonardo Luiz Okumura, Juliana Aparecida Diniz, Herbert Aleixo, Astréa Filomena de Souza Silva, André Fernando de Oliveira, Júnio Gonçalves da Silva
Publikováno v:
Analytical Methods. 13:5195-5203
A new methodology to determine directly the fungicide boscalid (BSC) was developed and successfully applied in red grape 100% juice, peel extracts, pulp and purple grape seeds (Vitis labrusca L.) with a working carbon paste electrode (CPE) without sa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::274d831f7e738a86f6fe82f3ba7aab9d
https://doi.org/10.1039/d1ay01134k
https://doi.org/10.1039/d1ay01134k
Autor:
Priscila A. Liberato, André Fernando de Oliveira, Júnio Gonçalves da Silva, Alexandre Gurgel, Herbert Aleixo, Leonardo Luiz Okumura, Astréa Filomena de Souza Silva
Publikováno v:
Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes. 56(9)
A novel voltammetric method with practically no sample pretreatment was developed for determination of Quinclorac (QNC) in rice samples by using a working Carbon Paste Electrode (CPE) modified with ionic liquid, with deposition potential (ED) of -1.4
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::367c9a6a5d822ac051fa7a25eb54d3d3
https://pubmed.ncbi.nlm.nih.gov/34348078
https://pubmed.ncbi.nlm.nih.gov/34348078
Autor:
Josiane M. da Silva, Sérgio Scherrer Thomasi, Adelir Aparecida Saczk, Zuy M. Magriotis, Fabiana S. Felix, Leonardo Luiz Okumura, Meryene de Carvalho Teixeira
Publikováno v:
Microchemical Journal. 148:66-72
A quick and simple procedure is described to determine pyridine and quinoline using voltammetric methods and carbon paste electrodes modified with activated carbon in the proportion of 50:20:30 w/w graphite:activated carbon:silicon. Studies with cycl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ca3db3e4eb22d32557a58fa9f76b16d
https://doi.org/10.1016/j.microc.2019.04.038
https://doi.org/10.1016/j.microc.2019.04.038