13 documents found, page 1 of 2
Occurrence of Pesticides and PPCPs in Surface and Drinking Water in Southern Br...
Caldas,Sergiane S.; Arias,Jean Lucas O.; Rombaldi,Caroline; Mello,Lucas L.; Cerqueira,Maristela B. R.; Martins,Ayrton F.; Primel,Ednei G.This study evaluated the environmental occurrence of fifty-one pesticides, pharmaceuticals and personal care products (PPCPs) in surface and drinking water samples collected in southern Brazil over a 4-year period. The method used involved a stage based on solid-phase extraction, followed by liquid chromatography tandem mass spectrometry. Thirty compounds were detected (22 different pesticides and 8 PPCPs) and ...
Multi-Residue Method for Determination of Thirty-Five Pesticides, Pharmaceutica...
Marube,Liziane C.; Caldas,Sergiane S.; Santos,Elisane O. dos; Michaelsen,Andressa; Primel,Ednei G.Ionic liquid-dispersive liquid-liquid microextraction (IL-DLLME) was used for the determination of different chemical classes of analytes for the first time. Limits of quantification (LOQs) ranged from 0.5 to 2.5 µg L-1, and the linearity ranged from the LOQ of each compound to 50 µg L-1. Recoveries ranged from 70 to 120% for the compounds, with relative standard deviations less than 18%. The proposed method de...
Evaluation of the Suitability of Analytical Methods in Trichothecene A and B De...
Feltrin,Ana Carla P.; Sibaja,Karen V. M.; Tusnski,Cíntia; Caldas,Sergiane S.; Primel,Ednei G.; Garda-Buffon,JaquelineAn investigation was conducted to standardize conditions for laccase and lipase activity required to maximize trichothecene degradation. The analytical methods were suitable and validated in model solutions for detection of five analytes (T-2 toxin, deoxynivalenol, nivalenol, 3-acetyldeoxynivalenol and 15-acetyldeoxynivalenol), the methods were then applied in the degradation tests of these trichothecenes. The ...
Photocatalytic Degradation for Treating Multipesticide Residues Using [Ru(bipy)...
Guimarães,Bruno de S.; Bernardes,Arthur A.; Salcedo,Gabriela M.; Caldas,Sergiane S.; Jorge,Marianna B.; Bianchini,Adalto; Wolke,Silvana I.This study aimed to develop and optimize an efficient photocatalytic process employing ruthenium [Ru(bipy)3]2+ doped TiO2-SiO2 for degrading synthetic wastewater containing six classes of pesticides (bentazone, carbofuran, clomazone, diuron, tebuconazole and pyraclostrobin). To optimize the degradation conditions for the six pesticides and assess the effect of two variables (reaction time and adsorption equilib...
Dispersive Liquid-Liquid Microextraction with Liquid Chromatography-Tandem Mass...
Bolzan,Cátia M.; Caldas,Sergiane S.; Guimarães,Bruno S.; Primel,Ednei G.Mineral water is known for its high purity. Because mineral water is produced by the infiltration of water through the soil, there is the possibility of contamination with pesticides. The aim of this study was to develop a simple, rapid and efficient method for the extraction and preconcentration of different classes of pesticides in mineral water samples by dispersive liquid-liquid microextraction (DLLME) coup...
The influence of salinity and matrix effect in the determination of antifouling...
Dominguez,Luís A. E.; Caldas,Sergiane S.; Primel,Ednei G.; Fillmann,GilbertoA method for the determination of irgarol and diuron using C18 solid-phase extraction (SPE) and liquid chromatography with electrospray interface tandem mass spectrometry was optimized, validated and applied in estuarine and coastal waters under the influence of Rio Grande harbors (Patos Lagoon). The impact of pre-filtration and salinity in the extraction processes by SPE using C18 and polymeric adsorbents were...
Quantification of pharmaceuticals and personal care product residues in surface...
Silveira,Maria Angelis K.; Caldas,Sergiane S.; Guilherme,Juliana R.; Costa,Fabiane P.; Guimarães,Bruno de S.; Cerqueira,Maristela B. R.; Soares,Bruno M.Currently, industrialized nations have faced a new problem, the contamination of water by emerging contaminants, such as pharmaceuticals and personal care products (PPCPs). A method based on solid-phase extraction (SPE) and liquid chromatography with electrospray ionization source tandem mass spectrometry was developed and validated for the determination of nimesulide, amitriptyline, enalapril, glibenclamide, h...
Determination of pesticide residues in sugarcane honey by QuEChERS, and liquid ...
Sampaio,Maicon R. F.; Tomasini,Débora; Cardoso,Liziane V.; Caldas,Sergiane S.; Primel,Ednei G.This paper aims at describing a method to determine the pesticides 2,4-D, diuron and fipronil in sugarcane honey. The QuEChERS method was employed for extraction and the quantification was carried out by high performance liquid chromatography coupled with diode array detector (HPLC-DAD) and liquid chromatography-tandem mass spectrometry with electrospray ionization source (LC-ESI-MS/MS). After the optimization ...
Optimization and validation of a method using SPE and LC-APCI-MS/MS for determi...
Cardoso,Liziane V.; Tomasini,Débora; Sampaio,Maicon R. F.; Caldas,Sergiane S.; Kleemann,Natiele; Primel,Ednei G.; Gonçalves,Fabio F.In this work, an analytical method based on solid phase extraction (SPE) and liquid chromatography tandem mass spectrometry (LC-APCI-MS/MS) was developed and validated for the determination and confirmation of five pharmaceuticals in water samples. The limits of detection (LOD) ranged from 0.053 to 0.53 µg L-1 and the limits of quantification (LOQ) from 0.16 to 1.6 µg L-1. Good linearity was obtained with r > 0...
Degradation of herbicide diuron in water employing the Fe0/H2O2 system
Cabrera,Liziara C.; Caldas,Sergiane S.; Rodrigues,Sandra; Bianchini,Adalto; Duarte,Fábio A.; Primel,Ednei G.A degradation system using metallic iron and hydrogen peroxide (Fenton reaction) was employed for the degradation of the diuron herbicide. In order to obtain the maximum degradation the main conditions such as pH, hydrogen peroxide concentration and iron amount, were optimized. Herbicide degradation was evaluated by liquid chromatography with diode array detection (HPLC-DAD) and liquid chromatography tandem mas...