Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Valdomiro Lacerda Martins"'
Autor:
Valdomiro Lacerda Martins, Joel Santos
Publikováno v:
Revista Multidisciplinar de Educação e Meio Ambiente. 2:1-8
Na Amazônia o gênero Oenocarpus bacaba MART é usado para extração da polpa e as sementes são jogadas quando poderia retirar o óleo para produção de biodiesel. O trabalho focou-se na produção e estudo das variáveis que afetam no rendimento
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d5312e209313603bd9ce476fe4bff040
https://doi.org/10.51189/rema/1950
https://doi.org/10.51189/rema/1950
Autor:
Josiane Amorim Reis, Paulo Roberto Barros Gomes, Wellington da Silva Lyra, Valdomiro Lacerda Martins
Publikováno v:
Revista Brasileira de Gestão Ambiental e Sustentabilidade. 7:455-468
Este trabalho propõe um método colorimétrico por imagens digitais para determinação de metanol em bebidas alcoólicas. O método é baseado na oxidação do metanol a formaldeído, seguido da reação com ácido cromotrópico produzindo um compo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d3461def6d3dd819cb140dd2383c952b
https://doi.org/10.21438/rbgas(2020)071601
https://doi.org/10.21438/rbgas(2020)071601
Autor:
Orlando Fatibello-Filho, Valdomiro Lacerda Martins, Edemar Benedetti-Filho, Luzia Pires dos Santos Benedetti, Tiago Almeida Silva, Vagner Bezerra dos Santos
Publikováno v:
Analytical Methods. 7:7568-7573
A novel, simple and low-cost analytical procedure for sulfite determination in beverage samples is presented. The approach proposed consists of image capture from a sulfite colorimetric reaction, using a system built with low-cost materials for lumin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::259f32e333bbfcd97ed59a197784fa7c
https://doi.org/10.1039/c5ay01372k
https://doi.org/10.1039/c5ay01372k
Autor:
Edemar Benedetti Filho, Luzia Pires dos Santos Benedetti, Tiago Almeida Silva, Orlando Fatibello-Filho, Valdomiro Lacerda Martins, Vagner Bezerra dos Santos
Publikováno v:
Analytical Methods. 7:4138-4144
A low-cost analytical method for quantification of ethanol in drinks based on the combination of a colorimetric spot-test and a digital image-based (DIB) method is proposed. The digital images from spot-test reactions were captured using a digital ca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::03a46f5c09e1730a272d1b524b0a003a
https://doi.org/10.1039/c5ay00529a
https://doi.org/10.1039/c5ay00529a
Autor:
Francisco Antônio da Silva Cunha, Luciano F. Almeida, Mário César Ugulino de Araújo, Valdomiro Lacerda Martins, Wellington da Silva Lyra, Paulo Henrique Gonçalves Dias Diniz
Publikováno v:
Anal. Methods. 6:1044-1050
This paper proposes combining Multiple Linear Regression (MLR) and Digital Image-Based Flame Emission Spectrometry (DIB-FES) to overcome the inherent spectral interference in Flame Emission Spectrometry (FES) when sodium and calcium are present in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a67daad7f9a5b1aa6c5436c05de14ee1
https://doi.org/10.1039/c3ay41005f
https://doi.org/10.1039/c3ay41005f
Autor:
Renato A.N. Andrade, Pablo N.T. Moreira, Valdomiro Lacerda Martins, Stéfani Iury E. Andrade, Daniel Jackson Estevam da Costa, Wellington da Silva Lyra, Mário César Ugulino de Araújo
Publikováno v:
Microchemical Journal. 108:151-155
The traditional flow chemiluminescence (CL) systems typically use flow cells in spiral shape mounted in front of a photomultiplier tube (PMT). The sample is transported by using carrier fluids, undergoes dispersion, and mixes with reagents and CL rea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::30cc56855347df50b47fbd95478bc480
https://doi.org/10.1016/j.microc.2012.10.009
https://doi.org/10.1016/j.microc.2012.10.009
Autor:
Luciano F. Almeida, Mário César Ugulino de Araújo, Edvan Cirino da Silva, Edvaldo N. Gaião, Wellington da Silva Lyra, Valdomiro Lacerda Martins
Publikováno v:
Analytica Chimica Acta. 570:283-290
The exploitation of digital images obtained from a CCD camera (WebCam) as a novel instrumental detection technique for titration is proposed for the first time. Named of digital image-based (DIB) titration, it also requires, as a traditional titratio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a4012d135367653c1133da776797a60
https://doi.org/10.1016/j.aca.2006.04.048
https://doi.org/10.1016/j.aca.2006.04.048
Autor:
Everaldo Paulo de Medeiros, Osmundo D. Pessoa Neto, Mauro Korn, Mario C U Araúo, Josué Carinhanha Caldas Santos, Suzana L Castro, Ricardo Chaves Lima, Valdomiro Lacerda Martins, Sérgio R. B. Santos
Publikováno v:
Journal of AOAC INTERNATIONAL. 88:1064-1068
A flow-injection biamperometric method for determination of pantoprazole (PTZ) in pharmaceutical tablets is reported for the first time. The reversible redox couples Fe3+/Fe2+, Fe(CN)63−/Fe(CN)64−, Ce4+/Ce3+, VO3−/VO2+, and I2/I− were tested
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f87a883988ad7e492fcbb7badb5cd810
https://doi.org/10.1093/jaoac/88.4.1064
https://doi.org/10.1093/jaoac/88.4.1064
Autor:
Mário César Ugulino de Araújo, Suzana L Castro, Edvan Cirino da Silva, Luciano Farias De Almeida, Valdomiro Lacerda Martins, Roberto Kawakami Harrop Galvão
Publikováno v:
Journal of Chemical Information and Computer Sciences. 43:1725-1732
Instrumental analysis techniques that employ measurements based on inflection points may have their accuracy compromised due to the need for signal differentiation, which is very sensitive to instrumental noise. This paper presents a strategy for loc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5bed5afb723f79418228abd4f20dda1
https://doi.org/10.1021/ci034112w
https://doi.org/10.1021/ci034112w
Autor:
Luciano F. Almeida, Mário César Ugulino de Araújo, Pablo N.T. Moreira, Edvan Cirino da Silva, Valdomiro Lacerda Martins
Publikováno v:
Analytica Chimica Acta. 486:143-148
A novel strategy for implementing the automatic standard addition method (SAM) is described. By using a flow–batch system that presents the intrinsic favourable characteristics of the flow and batch techniques, the proposed strategy performs fast s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::28a327de3c18331e34b5eb9ccdae5e4e
https://doi.org/10.1016/s0003-2670(03)00502-6
https://doi.org/10.1016/s0003-2670(03)00502-6