Abstract
In this work, we developed a method based on ultrasound-assisted emulsification microextraction (USAEME) for the determination of nickel by flame atomic absorption spectrometry (FAAS). The method is based on the use of the organic solvent trichloroethylene and 2,2′-thiazolylazo-p-cresol (TAC) as a chelating reagent in a solution containing nickel ions. After ultrasonic emulsification, the mixture is centrifuged to separate the phases. Subsequently, the supernatant is discarded, and the enriched phase is diluted with nitric acid. The nickel content in this new mixture is quantified by FAAS. The following variables were optimized: type of solvent (trichloroethylene), type of chelating reagent (TAC), volume of extraction solvent (100 mL), concentration of chelating reagent (0.015 % w/v), pH (8.0), time of sonication (5.0 min), and time of centrifugation (4.0 min). The limits of detection and quantification were calculated under optimum conditions (0.23 and 0.77 μg L−1, respectively). The enrichment factor obtained was 190. The relative standard deviation (RSD%) of the method (10.0 μg L−1) was 2.3–4.1 %. The proposed method is simple, economical, fast, and efficient for the determination of nickel by FAAS. The procedure was applied to the determination of nickel in certified reference material (BCR-713, wastewater) and water samples.
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The authors acknowledge the financial support of the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and the Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB).
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Lemos, V.A., Jesus Ferreira, V., Barreto, J.A. et al. Development of a Method Using Ultrasound-Assisted Emulsification Microextraction for the Determination of Nickel in Water Samples. Water Air Soil Pollut 226, 141 (2015). https://doi.org/10.1007/s11270-015-2392-8
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DOI: https://doi.org/10.1007/s11270-015-2392-8