Optimization of magnetic solid phase microextraction with CoFe2O4 nanoparticles unmodified for preconcentration of cadmium in environmental samples by flame atomic absorption spectrometry
| Autor: | Amalia Luz Costa Pereira, Marcos A. Bezerra, Sergio Gustavo Marchetti, Fabio de S. Dias, Maria Elizabeth P.A. Guarino, Pablo P. Pedra |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Oyster
Materials science chemistry.chemical_element Nanoparticle 02 engineering and technology Solid-phase microextraction 01 natural sciences Analytical Chemistry CADMIUM Column chromatography Adsorption biology.animal SOLID-PHASE MICROEXTRACTION Spectroscopy Cadmium Chromatography biology MAGNETIC NANOPARTICLE 010401 analytical chemistry Extraction (chemistry) Ciencias Químicas Fractional factorial design 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry PRE-CONCENTRATION Química Analítica 0210 nano-technology CIENCIAS NATURALES Y EXACTAS |
| Popis: | A method of preconcentration based in the magnetic solid phase microextraction with CoFe 2 O 4 nanoparticles for the determination of cadmium in oyster and water samples using flame atomic absorption spectrometry (FAAS). Magnetic nanomaterials ones have aroused a greater interest in the area of analytical chemistry because of the high area of material and separation facility of the adsorbent. The statistical significance variables, extraction time, nanoparticles mass, pH, eluent concentration and desorption time were evaluated using a fractional factorial design of two levels (2 5–1 ). Afterward, a design Doehlert was used to optimize the pre-concentration process. The best experimental conditions were: nanoparticles mass (25 mg), pH (10.0) and eluent concentration of 1.20 mol L −1 . The method allowed the determination of cadmium with a LOD of 0.24 μg L −1 and LOQ of 0.80 μg L −1 . The precision expressed as relative standard deviation (RSD) of 3.33% for cadmium concentration with 20 μg L −1 , the accuracy of the method was confirmed by the analysis of materials certified reference NIST 1566b Oyster tissue, pre-concentration factor 31. The method was applied to the analysis of the oyster and water samples has determined the concentration of cadmium from 4.6 to 7.8 mg kg −1 for oyster and 2.75 to 4.8 μg L −1 for water. Fil: de S Dias, Fabio. Universidade Federal Do Recôncavo Da Bahia; Brasil Fil: Guarino, Maria Elisabeth P.A.. Universidade Estadual Do Sudoeste Da Bahia; Brasil Fil: Costa Pereira, Amalia L.. No especifíca; Fil: Pedra, Pablo P.. Universidade Federal Do Recôncavo Da Bahia; Brasil Fil: de A. Bezerra, Marcos. Universidade Estadual Do Sudoeste Da Bahia; Brasil Fil: Marchetti, Sergio Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina |
| Databáze: | OpenAIRE |
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