Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Luana Bastos Santos"'
Autor:
VALFREDO LEMOS, Luana Bastos Santos
Publikováno v:
Journal of the Brazilian Chemical Society.
A sensitive method is proposed to determine antimony species using vortex-assisted ionic liquid-based liquid-phase microextraction and digital imaging colorimetry. SbIII forms a ternary complex with 2-(5-bromo-2-pyridylazo)-5-(diethylamino)phenol, as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::13a4a1317139d731e8c7e8d33a9cbb85
https://doi.org/10.21577/0103-5053.20220075
https://doi.org/10.21577/0103-5053.20220075
Publikováno v:
Microchemical Journal. 180:107543
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::28b55927111be7e57792ec2418fa261b
https://doi.org/10.1016/j.microc.2022.107543
https://doi.org/10.1016/j.microc.2022.107543
Autor:
Rosivan dos Santos de Assis, Ricardo J. Cassella, Cleber Galvão Novaes, Valfredo Azevedo Lemos, Luana Bastos Santos, Jeferson Alves Barreto
Publikováno v:
Talanta. 238(Pt 1)
Dispersive liquid-liquid microextraction (DLLME) has recently been widely used in the separation and preconcentration of various chemical species. Among the various approaches using DLLME are systems that use a syringe as an extraction environment. I
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea5ba3a9ee473b2790fa2142b5062ad3
https://pubmed.ncbi.nlm.nih.gov/34857335
https://pubmed.ncbi.nlm.nih.gov/34857335
Autor:
Alexilda Oliveira de Souza, Djalma Menezes de Oliveira, Luana Bastos Santos, Valfredo Azevedo Lemos
Publikováno v:
Journal of the Iranian Chemical Society. 16:1879-1889
This work is based on the application of the eggshell membrane (ESM) of fresh chicken as a sorbent in a solid phase extraction procedure for arsenic speciation with detection by electrothermal atomic absorption spectrometry. The ESM can adsorb severa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fa089aa71953e3daf5a3c2f10a34ddcd
https://doi.org/10.1007/s13738-019-01665-8
https://doi.org/10.1007/s13738-019-01665-8
Autor:
Walter Nei Lopes dos Santos, Sergio Luis Costa Ferreira, Valfredo Azevedo Lemos, Luana Bastos Santos, Rebeca Moraes Menezes, Rafael Vasconcelos Oliveira
Publikováno v:
TrAC Trends in Analytical Chemistry. 110:357-366
Liquid phase microextraction (LPME) has been widely used in extraction and preconcentration systems as an excellent alternative to conventional liquid phase extraction. In this work, a critical review is presented on LPME-based flow injection preconc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d969b18b891aa186236fc253e3795e39
https://doi.org/10.1016/j.trac.2018.11.031
https://doi.org/10.1016/j.trac.2018.11.031
Autor:
Sergio Luis Costa Ferreira, Rosivan dos Santos de Assis, Valfredo Azevedo Lemos, Jeferson Alves Barreto, Cleber Galvão Novaes, Cheilane T. de Souza, Luana Bastos Santos
Publikováno v:
Water, Air, & Soil Pollution. 231
Recently, analytical procedures based on computer vision related to the colorimetric analysis of digital images have been described in the scientific literature. In this sense, a novel analytical approach is presented based on digital image colorimet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ec44878665a05f4203283390e14acec1
https://doi.org/10.1007/s11270-020-04838-x
https://doi.org/10.1007/s11270-020-04838-x
Autor:
Valfredo Azevedo Lemos, Jeferson Alves Barreto, Luana Bastos Santos, Sergio Luis Costa Ferreira, Ivanilson Vieira Souza Junior
Publikováno v:
Water, Air, & Soil Pollution. 231
In this work, a simple and fast method for the determination of cobalt in vitamin B12 and water samples was developed. The procedure is based on the preconcentration of the element using dispersive liquid-liquid microextraction (DLLME) and subsequent
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a580070e9d3aa191df5d735403a276c2
https://doi.org/10.1007/s11270-020-04680-1
https://doi.org/10.1007/s11270-020-04680-1
Autor:
Valfredo Azevedo Lemos, Uneliton Neves Silva, Rosivan dos Santos de Assis, Luana Bastos Santos
Publikováno v:
Talanta. 238:123038
An on-line system employing switchable-hydrophilicity solvent-based liquid-phase microextraction (SHS-LPME) is described in this work. The method is based on the preconcentration of the species formed between cobalt and the reagent 1-nitroso-2-naphth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c699e0356972013b7d0370b2dff4178f
https://doi.org/10.1016/j.talanta.2021.123038
https://doi.org/10.1016/j.talanta.2021.123038
Autor:
Rosivan dos Santos de Assis, Valfredo Azevedo Lemos, Jeferson Alves Barreto, Cleber Galvão Novaes, Marcos A. Bezerra, Luana Bastos Santos
Publikováno v:
TrAC Trends in Analytical Chemistry. 146:116478
In recent years, the search for the principles of green chemistry in analytical methods has grown considerably. In green analytical chemistry, solvents occupy an essential place. Some criteria are necessary for a solvent to be qualified as a green me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::84ecfadec5bf27703c66ffa8fdca62a9
https://doi.org/10.1016/j.trac.2021.116478
https://doi.org/10.1016/j.trac.2021.116478
Autor:
Ricardo J. Cassella, Rosivan dos Santos de Assis, Luana Bastos Santos, Jeferson Alves Barreto, Valfredo Azevedo Lemos
Publikováno v:
Microchemical Journal. 157:105064
In the present work, preconcentration by pressure variation in-syringe dispersive liquid-liquid microextraction (PV-IS-DLLME) was used for the determination of cobalt by digital image colorimetry. The detection system, built in the laboratory, involv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::49fd4e16db9f371bb5c40fe3ac2a9a37
https://doi.org/10.1016/j.microc.2020.105064
https://doi.org/10.1016/j.microc.2020.105064