Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Maria Eliana L. R. Queiroz"'
Publikováno v:
Orbital: The Electronic Journal of Chemistry, Vol 12, Iss 2 (2020)
This paper is about a typical mistake in the calculation of standard deviation of measurements in cases in which there are no differences among repetitious replicates. Some students believe the standard deviation in those case is equal to zero. So, t
Externí odkaz:
https://doaj.org/article/9c9e04223624446daccfdd809bbf36ac
Autor:
Fernando A. Santos, José H. de Queiroz, Jorge L. Colodette, Mauro Manfredi, Maria Eliana L. R. Queiroz, Celso S. Caldas, Filippe E. F. Soares
Publikováno v:
Química Nova, Vol 37, Iss 1, Pp 56-62 (2014)
The sugarcane industry has huge potential for biorefinery concept application, given its development in recent years. In this context, cane sugar straw has become an attractive raw material for biofuel production. This study aims to investigate the c
Externí odkaz:
https://doaj.org/article/675436a5f94946989a7f97a595d0f616
Autor:
Gevany Paulino de Pinho, Flaviano Oliveira Silvério, Antônio Augusto Neves, Maria Eliana L. R. Queiroz, Maria Antônia V. M. Starling
Publikováno v:
Química Nova, Vol 33, Iss 4, Pp 909-913 (2010)
Multiresidue methods for pesticides monitoring by GC are commonly employed, however, it is well known that the presence of compounds of the matrix introduces errors during the quantiûcation. The main consequence of matrix effect is an increasing or
Externí odkaz:
https://doaj.org/article/3f5d46d60d4f49baac2861e7b4085582
Publikováno v:
Química Nova, Vol 32, Iss 4, Pp 987-995 (2009)
The lack of accuracy of a chromatographic method can be associated with the matrix effect. This effect is observed in pesticide quantification by gas chromatography when the chromatographic signals of standards prepared in solvents are compared with
Externí odkaz:
https://doaj.org/article/7874851aeba04ab28f779dd6fcb7fa30
Publikováno v:
Química Nova, Vol 32, Iss 1, Pp 92-98 (2009)
This work was aimed on optimization of the matrix solid-phase dispersion (MSPD) technique using gas chromatography for analyzing residues of chlorpyriphos, λ-cyhalothrin, cypermethrin and deltamethrin in tomatoes. The results showed that silica was
Externí odkaz:
https://doaj.org/article/ebf079bf8d6c4495b3fc181481e7f671
Autor:
Nivia S. Oliveira, André Fernando Oliveira, Antonio Augusto Neves, Maria Eliana L. R. Queiroz
Publikováno v:
SSRN Electronic Journal.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::958909c1b54b14c132c96e10849e77cb
https://doi.org/10.2139/ssrn.4245335
https://doi.org/10.2139/ssrn.4245335