Showing papers by "Maria Lúcia Ribeiro published in 2014"
TL;DR: In this paper, a simple, validated and economic method is described for the determination of deltamethrin and cypermethrin in bovine milk, based on simultaneous extraction and clean up on matrix solid-phase dispersion (MSPD) with Celite® using hexane/acetone (7:3 v/v), followed by gas chromatography with electron capture detector (GC-µECD) analysis.
Abstract: A simple, validated and economic method is described for the determination of deltamethrin and cypermethrin in bovine milk. It is based on simultaneous extraction and clean up on matrix solid-phase dispersion (MSPD) with Celite® using hexane/acetone (7:3 v/v), followed by gas chromatography with electron capture detector (GC-µECD) analysis. Confirmatory analysis was carried out by GC-mass spectrometry (MS). The simultaneous process showed to be efficient for milk samples. Average recoveries from fortified bovine milk samples were in the range of 60 to 81%, with relative standard deviation (RSD) from 9 to 18%. Method limits of quantification (LOQ) were 0.010 µg g-1 for both pyrethroids and limits of detection (LOD) were 0.007 and 0.002 µg g-1 for cypermethrin and deltamethrin, respectively. The main advantage of the proposed method is the reduced number of steps involved, besides being simple, rapid and inexpensive. The method was applied to whole milk samples collected at dairy farms in the municipality of Chapada dos Guimaraes, MT, Brazil. Deltamethrin was not detected in the twenty analyzed samples, and cypermethrin was detected in four samples (20%) at trace levels (< LOQ).
12 citations
01 Jul 2014
TL;DR: A presente pesquisa tem como objetivo inventariar os temas e autores voltados ao estudo dos Comites de Bacia Hidrografica e lacunas existentes neste campo de pesquisis.
Abstract: A presente pesquisa tem como objetivo inventariar os temas e autores voltados ao estudo dos Comites de Bacia Hidrografica e lacunas existentes neste campo de pesquisa. A organizacao da base de dados para as analises se deu por meio da identificacao e selecao dos trabalhos de 1987 ate 2012, a partir do banco de teses da Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES). Para a busca utilizaram-se como palavras-chave: Comite de Bacia Hidrografica. O inventario e formado por 81 trabalhos, entre dissertacoes e teses e esta organizado e analisado sob os seguintes aspectos: caracterizacao geral, analise disciplinar, tematica e autores. Os dados revelam que o interesse pela pesquisa vem crescendo nas Instituicoes de Ensino Superior pelo Brasil e que diversas areas do conhecimento vem pesquisando sobre os Comites, tornando-a, assim, uma area particular de estudo.
2 citations