Results 1 to 10 of about 447 (115)
Determinação simultânea de trialometanos e agrotóxicos em água por cromatografia gasosa [PDF]
Quimica Nova, 2011 A method for simultaneous analysis of trihalomethanes and organochloride and pyrethroid pesticides in water utilizing SPME-HS and GC-ECD was developed.
Antonio A Neves
exaly +5 more sources
Cromatografia gasosa bidimensional abrangente (GC × GC) [PDF]
Quimica Nova, 2009 This paper presents the fundamental principles, instrumentation and selected applications of comprehensive two-dimensional gas chromatography (GC × GC). In this technique, introduced in 1991, two capillary columns are coupled and proper modulating interfaces continuously collect the eluate from the first column, transferring it to the second column ...
Marcio Pozzobon Pedroso +2 more
exaly +4 more sources
Efeito de matriz na quantificação de agrotóxicos por cromatografia gasosa [PDF]
Quimica Nova, 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 those of the analyte in extracts of complex matrices.
Antonio A Neves, Flaviano O Silverio
exaly +4 more sources
Caracterização de amostras petroquímicas e derivados utilizando cromatografia gasosa bidimensional abrangente (GCxGC) [PDF]
Quimica Nova, 2006 The goal of this article is to discuss the application of comprehensive two-dimensional gas chromatography (GCxGC) to petrochemical samples. The use of GCxGC for petroleum and petroleum derivatives characterization, through group type analysis, or BTEX (benzene, toluene, ethylbenzene, xylenes), total aromatic hydrocarbons, polyaromatic hydrocarbons ...
Carin Von Muhlen +2 more
exaly +5 more sources
Detecção em cromatografia gasosa rápida e cromatografia gasosa bidimensional abrangente
Scientia Chromatographica, 2011 The fast gas chromatography and the comprehensive two-dimensional gas chromatography generate peaks much narrower than in conventional gas chromatography. In these techniques, the peak width (at baseline) commonly observed ranges from 1 s to 50 ms, reaching values as small as units of milliseconds.
Marcio Pozzobon Pedroso
exaly +2 more sources
Aplicação da cromatografia por exclusão e da cromatografia gasosa de alta resolução na análise do café [PDF]
Quimica Nova, 1997 The combination of high performance exclusion chromatography (HPEC) and gas chromatography (GC) was applied to the analysis of six coffee samples that were previously characterized by sensory tests as of good or poor quality. The data obtained by the two techniques were statistically evaluated by "Principal Components Analysis" (PCA) using selected ...
Moreira, R. F. A. +2 more
exaly +4 more sources
Experimento didático sobre cromatografia gasosa: uma abordagem analítica e ambiental [PDF]
Quimica Nova, 2008 This paper describes an experiment to teach the principles of gas chromatography exploring the boiling points and polarities to explain the elution order of a series of alcohols, benzene and n-propanone, as well as to teach the response factor concept and the internal standard addition method.
Jorge C Masini, Masini Jorge C
exaly +4 more sources
Cromatografia gasosa ultrarrápida: uma visão geral sobre parâmetros, instrumentação e aplicações [PDF]
Quimica Nova, 2010 Universidade Estadual Paulista Instituto de Quimica Pesquisa da Qualidade de Combustiveis ...
Rodrigo Sequinel +2 more
exaly +5 more sources
Estado da arte da cromatografia gasosa de alta resolução e alta temperatura [PDF]
Quimica Nova, 2000 The developments in stationary phase synthesis and capillary column technology, have opened new perspectives in analysis of high molecular mass compounds (³600 daltons) and thermolabile organic compounds by High Temperature High Resolution Gas Chromatography (HT-HRGC).
Alberto dos Santos Pereira +1 more
exaly +3 more sources
Quimica Nova, 2012 This study investigated the levels of plasticizer endocrine disruptors (diethyl phthalate, dibutyl phthalate, and bisphenol A) in drinking water at Paraíba do Sul River region and release of these compounds from bottled water.
Renata Rodrigues Souza +4 more
exaly +3 more sources