Data/hora: 10/06/2024 11:02:30

Provedor de dados: 	42	
País: 	Brazil	
Título: 	Multivariate optimization of an ultrasound-assisted extraction procedure for Cu, Mn, Ni and Zn determination in ration to chickens	
Autores: 	BARROS,JOÉLIA M.; BEZERRA,MARCOS A.; VALASQUES,GISSELI S.; NASCIMENTO JÚNIOR,BARAQUÍZIO B. DO; SOUZA,ANDERSON S.; ARAGÃO,NÁDIA M. DE.	
Data: 	2013-09-01	
Ano: 	2013	
Palavras-chave: 	Rations to chicken; Ultrasound-assisted extraction; Mixture design; Doehlert design; Metals.	
Resumo: 	In this work, multivariate optimization techniques were used to develop a method based on the ultrasound-assisted extraction for copper, manganese, nickel and zinc determination from rations for chicken nutrition using flame atomic absorption spectrometry. The proportions of extracting components (2.0 mol.L–1 nitric, hydrochloric and acetic acid solutions) were optimized using centroid-simplex mixture design. The optimum proportions of this mixture taken as percentage of each component were respectively 20%, 37% and 43%. Variables of method (sample mass, sonication time and final acid concentration) were optimized using Doehlert design. The optimum values found for these variables were respectively 0.24 g, 18s and 3.6 mol.L–1. The developed method allows copper, manganese, nickel and zinc determination with quantification limits of 2.82; 4.52; 10.7; e 9.69 µg.g–1, and precision expressed as relative standard deviation (%RSD, 25 µg.g–1, N = 5) of 5.30; 2.13; 0.88; and 0.83%, respectively. This method was applied in the analytes determination from chicken rations collected from specialized commerce in Jequié city (Bahia State/Brazil). Application of paired t-test at the obtained results, in a confidence level of 95%, does not show significant difference between the proposed method and the microwave-assisted digestion.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300891	
Editor: 	Academia Brasileira de Ciências	
Relação: 	10.1590/S0001-37652013000300005	
Formato: 	text/html	
Fonte: 	Anais da Academia Brasileira de Ciências  v.85 n.3 2013	
Fonte: 	info:eu-repo/semantics/openAccess