Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Daniel Rodrigues Vieira"'
Autor:
Regina Terumi Yamaki, Daniel Rodrigues Vieira, Cleber Galvão Novaes, Hygor Rodrigues de Oliveira, Valfredo Azevedo Lemos, Sandra Carvalho
Publikováno v:
Química Nova, Vol 32, Iss 7, Pp 1943-1946 (2009)
The pKa values of the 6-[2´-(6´-methyl-benzothiazolylazo)]-1,2-dihydroxy-3,5-benzenedisulfonic acid (Me-BDBD) have been determined at 25 °C, in 0.10 mol L-1 NaCl medium by spectrophotometric method. The SQUAD computer program was used to process e
Externí odkaz:
https://doaj.org/article/9601afffb4b5466cbf0795a32bb3dc5c
Autor:
Valfredo Azevedo Lemos, Sandra Carvalho, Cleber Galvão Novaes, Regina Terumi Yamaki, Hygor Rodrigues de Oliveira, Daniel Rodrigues Vieira
Publikováno v:
Química Nova v.32 n.7 2009
Química Nova
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
Química Nova, Volume: 32, Issue: 7, Pages: 1943-1946, Published: 2009
Química Nova
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
Química Nova, Volume: 32, Issue: 7, Pages: 1943-1946, Published: 2009
The pKa values of the 6-[2´-(6´-methyl-benzothiazolylazo)]-1,2-dihydroxy-3,5-benzenedisulfonic acid (Me-BDBD) have been determined at 25 °C, in 0.10 mol L-1 NaCl medium by spectrophotometric method. The SQUAD computer program was used to process e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6aa79c745173108b01eda0ffe5c2063e
https://doi.org/10.1590/s0100-40422009000700042
https://doi.org/10.1590/s0100-40422009000700042
Autor:
Cleber Galvão Novaes, Moacy Selis Santos, Marcio J. Santos, Daniel Rodrigues Vieira, Valfredo Azevedo Lemos
Publikováno v:
Microchimica Acta. 157:215-222
Cloud point extraction employing the new reagent 6-[2′-(6′-methyl-benzothiazolylazo)]-1,2-dihydroxy-3,5-benzenedisulfonic acid as complexing agent and Triton X-114 as the surfactant is proposed for copper determination. A sample volume of 10 mL w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b1bc5cdbcf5e2c8c6655a259df06032f
https://doi.org/10.1007/s00604-006-0652-4
https://doi.org/10.1007/s00604-006-0652-4
Preconcentration Systems Using Polyurethane Foam/Me-BDBD for Determination of Copper in Food Samples
Autor:
Daniel Rodrigues Vieira, Valfredo Azevedo Lemos, Marcelo Eça Rocha, Cleber Galvão Novaes, Moacy Selis Santos, Regina Terumi Yamaki
Publikováno v:
Microchimica Acta. 153:193-201
A new reagent, 6-[2′-(6′-methyl-benzothiazolylazo)]-1,2-dihydroxy-3,5-benzenedisulfonic acid (Me-BDBD), was synthesised and used in on-line and off-line systems for copper preconcentration by solid-phase extraction. Spectrophotometry and Flame At
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6cc5441f1bb6b320130716254be1cd4d
https://doi.org/10.1007/s00604-005-0435-3
https://doi.org/10.1007/s00604-005-0435-3
Publikováno v:
Journal of AOAC International. 94(2)
A procedure was developed for the determination of lead (Pb) and manganese (Mn) using slurry sampling. The two elements were detected using flame atomic absorption spectrometry with a slotted tube atom trap. Slurries were prepared by adding nitric ac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9e57841729bcf9df5b178bada9f9a21e
https://pubmed.ncbi.nlm.nih.gov/21563701
https://pubmed.ncbi.nlm.nih.gov/21563701
Publikováno v:
Journal of hazardous materials. 155(1-2)
A solid-phase extraction method combined with flow injection (FI) on-line flame atomic absorption spectrometry (FAAS) for the determination of cadmium and nickel in tobacco samples is presented. The 2-aminothiophenol functionalized Amberlite XAD-4 (A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1e9d54f4874223bcd63f71d8dd43f4ef
https://pubmed.ncbi.nlm.nih.gov/18155353
https://pubmed.ncbi.nlm.nih.gov/18155353