6 documents found, page 1 of 1
Evaluation of ASTM D6584 method for biodiesel ethyl esters from sunflower oil a...
Dias,Adriana Neves; Kurz,Márcia Helena Scherer; Fagundes,Cássia Alessandra Maciel; Caldas,Sergiane Souza; Clementin,Rosilene MariaThis study describes for the first time the determination of glycerol and glycerides in samples of biodiesel ethyl esters from sunflower oil and soybean/tallow mixture and biodiesel methyl esters from soybean/tung mixture and tung oil by employing ASTM D6584 method. The results showed that ASTM D6584 can be used for other sources of biodiesel which represent an alternative to biodiesel production, mainly in Bra...
Risco de contaminação das águas de superfície e subterrâneas por agrotóxicos re...
Martini,Luiz Fernando Dias; Caldas,Sergiane Souza; Bolzan,Catia Marian; Bundt,Angela Da Cas; Primel,Ednei Gilberto; Avila,Luis Antonio deA produção agrícola geralmente está associada ao uso de agrotóxicos. Suas características físico-químicas, condições do solo e do ambiente determinam seu destino, assim como o seu potencial de contaminação dos mananciais hídricos. Com o intuito de prever a contaminação do ambiente por agrotóxicos, critérios e modelos matemáticos são utilizados para avaliar o risco de contaminação das águas subterrâneas e superf...
Ocorrência de agrotóxicos em águas subterrâneas de áreas adjacentes a lavouras ...
Silva,Diecson Ruy Orsolin da; Avila,Luis Antonio de; Agostinetto,Dirceu; Bundt,Angela Da Cas; Primel,Ednei Gilberto; Caldas,Sergiane SouzaThe objective this study was to monitor pesticide residues in groundwater at three different times and in seven regions producing rice in southern Brazil, in the 2007/08 season. Imazethapyr and fipronil were found in all regions studied. All groundwater samples from the Planície Costeira Interna to Lagoa dos Patos and Santa Catarina contained at least one pesticide. The lowest number of contaminated samples wer...
Otimização e validação de método empregando quechers modificado e lc-esi-ms/ms ...
Rodrigues,Sherol Acosta; Caldas,Sergiane Souza; Furlong,Eliana Badiale; Primel,Ednei Gilberto; Zanella,RenatoAn evaluation of the pesticides extraction from onion using a modern sample preparation method (QuEChERS) and determination by liquid chromatography tandem mass spectrometry was carried out. All the calibration curves showed r>0.99. The recoveries ranged between 61.8 and 120.0% with relative standard deviation lower than 20% for all compounds. Due to the occurrence of matrix effect, the quantification was perfo...
Principais técnicas de preparo de amostra para a determinação de resíduos de ag...
Caldas,Sergiane Souza; Gonçalves,Fábio Ferreira; Primel,Ednei Gilberto; Prestes,Osmar Damian; Martins,Manoel Leonardo; Zanella,RenatoThe determination of pesticide residues in water samples by Liquid Chromatography require sample preparation for extraction and enrichment of the analytes with the minimization of interferences to achieve adequate detection limits. The Solid Phase Extraction (SPE), Solid Phase Microextraction (SPME), Stir Bar Sorptive Extraction (SBSE) and Dispersive Liquid-Liquid Microextraction (DLLME) techniques have been wi...
Validação de método para determinação de ácidos orgânicos voláteis em efluentes...
Cerqueira,Maristela Barnes Rodrigues; Dias,Adriana Neves; Caldas,Sergiane Souza; Santana,Fabrício Butierres; D'Oca,Marcelo Gonçalves MontesThis work deals with the method validation for the determination of acetic, propionic and butyric acids (VFAs) in wastewaters from anaerobic reactors by HPLC-DAD. Separation was performed using a C18 column and the mobile phase composition were water pH 3.0 and methanol 90:10 (v/v). The detection and quantification was carried out at 220 nm. The method shows good linearity (r²>0.996), with adequate accuracy (89...