Carlos Eduardo Domingues Nazario
University of São Paulo
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Journal of Separation Science | 2011
Paulo Clairmont Feitosa de Lima Gomes; Juliana Y. Barletta; Carlos Eduardo Domingues Nazario; Álvaro J. Santos-Neto; Marya Anne Von Wolff; Cassiana Maria Reganhan Coneglian; Gisela de Aragão Umbuzeiro; Fernando M. Lanças
This paper presents the development of a procedure, which enables the analysis of nine pharmaceutical drugs in wastewater using gas chromatography-mass spectrometry (GC-MS) associated with solid-phase microextraction (SPME) for the sample preparation. Experimental design was applied to optimize the in situ derivatization and the SPME extraction conditions. Ethyl chloroformate (ECF) was employed as derivatizing agent and polydimethylsiloxane-divinylbenzene (PDMS-DVB) as the SPME fiber coating. A fractional factorial design was used to evaluate the main factors for the in situ derivatization and SPME extraction. Thereafter, a Doehlert matrix design was applied to find out the best experimental conditions. The method presented a linear range from 0.5 to 10 μg/L, and the intraday and interday precision were lower than 16%. Applicability of the method was verified from real influent and effluent samples of a wastewater treatment plant, as well as from samples of an industry wastewater and a river.
Analytical Methods | 2016
Felipe Nascimento Andrade; Carlos Eduardo Domingues Nazario; Álvaro J. Santos-Neto; Fernando M. Lanças
A highly selective method for the analysis of triazine herbicides in corn samples based on molecularly imprinted solid phase extraction (MISPE) has been developed. Molecularly imprinted polymers (MIPs) were synthesized by precipitation polymerization using atrazine as a template, methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as a crosslinker, and 2,2′-azobis-isobutrynitrile as an initiator. MISPE was developed for the on-line and automated enrichment of atrazine, simazine, terbutryn, simetryn and ametryn from corn sample extracts. High-performance liquid chromatography and time-of-flight mass spectrometry were used for the separation and confident determination of the herbicides. The limits of detection and quantitation of the proposed method were set to be 1.6–3.3 μg kg−1 and 5.0–10.0 μg kg−1. The method was successfully applied for the analysis of five types of corns and the recoveries of the triazines from the spiked samples ranged from 80.2 to 119.1%.
Journal of Separation Science | 2014
Lincoln F. M. Coutinho; Carlos Eduardo Domingues Nazario; Alessandra Maffei Monteiro; Fernando M. Lanças
Analyses in chromatographic systems able to save mobile and stationary phases without reducing efficiency and resolution are of current interest. These advantages regarding savings have challenged us to develop a system dedicated to miniaturized liquid chromatography. This paper reports on the development of a high-pressure syringe-type pump, an oven able to perform isothermal and temperature programming and a software program to control these chromatographic devices. The experimental results show that the miniaturized system can generate reproducible and accurate temperature and flow rate. The system was applied to the separation of statins and tetracylines and showed excellent performance.
Trends in Analytical Chemistry | 2015
Bruno Henrique Fumes; Meire Ribeiro da Silva; Felipe Nascimento Andrade; Carlos Eduardo Domingues Nazario; Fernando M. Lanças
Journal of Chromatography A | 2015
Carlos Eduardo Domingues Nazario; Meire Ribeiro da Silva; Maraíssa Silva Franco; Fernando M. Lanças
Analytical Methods | 2014
Carlos Eduardo Domingues Nazario; Paulo Clairmont Feitosa de Lima Gomes; Fernando M. Lanças
Archive | 2018
Ana Lúcia de Toffoli; Edvaldo Vasconcelos Soares Maciel; Carlos Eduardo Domingues Nazario; Fernando M. Lanças
Scientia Chromatographica | 2017
Carlos Eduardo Domingues Nazario; Thiago Gomes Ricci; Amandha Kaiser da Silva; Eduardo Sobieski Neto; Karla Regina Warszawski de Oliveira
Archive | 2017
Meire Ribeiro da Silva; Bruno Henrique Fumes; Carlos Eduardo Domingues Nazario; Fernando M. Lanças
Comprehensive Analytical Chemistry | 2017
Meire Ribeiro da Silva; Bruno Henrique Fumes; Carlos Eduardo Domingues Nazario; Fernando M. Lanças