Zobrazeno 1 - 10 of 10 pro vyhledávání: '"william cheuquepan"'
1
Raman spectroelectrochemical determination of clopyralid in tap water
Autor: Martin Perez-Estebanez, William Cheuquepan, Maria Huidobro, Jose Vicente Cuevas, Sheila Hernandez, Aranzazu Heras, Alvaro Colina
Clopyralid is a common herbicide used all around the world that can be dissolved in the rain stream and accumulate in underground water with the potential threat of reaching drinking water. Many methodologies have been proposed to perform quantitativ
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::50a236b82c466f7cab371c098c18c009
http://hdl.handle.net/10259/7434
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2
Double fingerprint characterization of uracil and 5-fluorouracil
Autor: Sheila Hernandez, Aranzazu Heras, William Cheuquepan, Martin Perez-Estebanez, José Vicente Cuevas-Vicario, Alvaro Colina
Publikováno v: Repositorio Institucional de la Universidad de Burgos (RIUBU)
instname
Time Resolved Raman spectroelectrochemistry (TR-Raman-SEC) has been used for the first time to obtain two different Raman spectra of one single analyte in the same experiment. This double detection has been accomplished thanks to the use of electroch
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f4ad49c43b0eea3a1d745b34e1564af
http://hdl.handle.net/10259/6129
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3
Multiamperometric-SERS detection of melamine on gold screen-printed electrodes
Autor: Sheila Hernandez, Lydia Garcia, Martin Perez-Estebanez, William Cheuquepan, Aranzazu Heras, Alvaro Colina
Publikováno v: Journal of Electroanalytical Chemistry. 918:116478
A new, simple and fast protocol to generate gold-based SERS substrates is presented in this work. Melamine is a compound widely used in the industry that can be toxic for humans if consumed even in low concentrations. EC-SERS is an excellent alternat
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45819178532f0cce5be595dfb614e9c6
https://doi.org/10.1016/j.jelechem.2022.116478
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4
Electrochemical generation of surface enhanced Raman scattering substrates for the determination of folic acid
Autor: L. Romay, William Cheuquepan, Sheila Hernandez, Martin Perez-Estebanez, Alvaro Colina, Aranzazu Heras
Publikováno v: Repositorio Institucional de la Universidad de Burgos (RIUBU)
instname
Electrochemistry is a very useful technique to generate surface enhanced Raman scattering (SERS) substrates. SERS depends on two mechanisms: the electromagnetic effect, related to the plasmonic properties of the nanostructures in the substrate, and t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab25a007851315f6012a94818fa58f79
https://doi.org/10.1016/j.jelechem.2021.115288
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5
Spectroelectrochemical and DFT approaches to the study of croconic acid adsorption at gold electrodes in acidic solutions
Autor: Antonio Rodes, José Manuel Orts, William Cheuquepan
Publikováno v: Journal of Electroanalytical Chemistry. 896:115396
The adsorption of species coming from croconic acid (4,5-dihydroxy-4-cyclopentene-1,2,3-trione, H2C5O5, CA) at gold electrodes was studied spectroelectrochemically in aqueous perchloric acid solutions. Voltammetric experiments suggest the existence o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::317a30ad4ed4bd56f796190dc81e68b5
https://doi.org/10.1016/j.jelechem.2021.115396
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6
Electrochemical Surface Oxidation Enhanced Raman Scattering on Cu
Autor: William Cheuquepan, Martin Perez-Estebañez, Sheila Hernandez, Maria Aranzazu Heras, Alvaro Colina
Publikováno v: ECS Meeting Abstracts. :1785-1785
One of the main characteristic of Analytical Chemistry is a constant searching for new methodologies to overcome analytical problems. Minimization of analysis time and sample volumes, replacement of extensive extraction protocols and improvement of s
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c7714556f384cfdb521bc38122af7673
https://doi.org/10.1149/ma2021-01451785mtgabs
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7
Iron porphyrin-modified electrodes: influence of the method of modification on the stability and electroactivity in oxidation of sulfite or hydrogensulfite in ethanol–water solutions
Autor: Yo-Ying Chen, Mauricio Isaacs, Betty Matsuhiro, Leonora Mendoza, J. Henríquez, Galo Ramírez, William Cheuquepan, M. C. Goya, M.C. Arévalo, María J. Aguirre
Publikováno v: JOURNAL OF COORDINATION CHEMISTRY
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
The aim of this work is to study four types of modification of a glassy carbon electrode by Fe(III)-tetrakis(p-tetraaminophenyl)porphyrin and determine the influence of the method of immobilization of the complex on glassy carbon in electrocatalytic
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67658cb73f551ffab5eb8b7769dc3cd5
https://doi.org/10.1080/00958970902942982
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8
EFFECT OF THE NUMBER OF SUBSTITUENTS ON THE BEHAVIOR OF MODIFIED ELECTRODES WITH COBALT PORPHYRINS SUBSTITUTED WITH A DIFFERENT NUMBERS OF BIS(METHOXYPHENYL) GROUPS TOWARD THE OXIDATION OF SULFITE
Autor: M.I Azócar, Mauricio Isaacs, William Cheuquepan, Betty Matsuhiro, María J. Aguirre, Diego Villagra, Leonora Mendoza, Galo Ramírez, Yo-Ying Chen
Publikováno v: Journal of the Chilean Chemical Society v.55 n.2 2010
SciELO Chile
CONICYT Chile
instacron:CONICYT
JOURNAL OF THE CHILEAN CHEMICAL SOCIETY
Artículos CONICYT
Journal of the Chilean Chemical Society, Volume: 55, Issue: 2, Pages: 253-256, Published: JUN 2010
In this study, we compared four glassy carbon electrodes modified with adsorbed porphyrins of cobalt containing one, two, three, or four bis(methoxyphenyl) groups as substituents of the ligand. The aim of this work was to determine the effect of thes
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a5645ebc632bd41e51b9ea0f2b6cb6b
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000200024
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9
Electrooxidation of nitrite mediated by cu-x-tetraaminophenylporphyrin (x=2, 3, and 4) glassy carbon-modified electrodes: effect of substituent position
Autor: Yo Ying Chen, María J. Aguirre, Galo Ramírez, Andrés Camargo, William Cheuquepan
Publikováno v: ELECTROANALYSIS
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
A study of glassy carbon electrodes modified with poly-Cu-x-tetraaminophenylporphyrin (TAPP) (x=2, 3, and 4) toward the electrooxidation of nitrite is reported. The position of the amino group influences the degree of electropolymerization and the re
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3b9a5f53e5bde469d3f94a5fea72aa44
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