Skip navigation
Universidade Federal da Bahia |
Repositório Institucional da UFBA
Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/14916
Tipo: Artigo de Periódico
Título: Multivariate optimization of an ultrasound-assisted extraction procedure for Cu, Mn, Ni and Zn determination in ration to chickens
Título(s) alternativo(s): Anais da Academia Brasileira de Ciencias
Autor(es): Barros, Joélia Martins
Bezerra, Marcos de Almeida
Valasques, Gisseli Souza
Nascimento Júnior, Baraquízio Braga do
Souza, Anderson Santos
Aragão, Nádia Machado de
Autor(es): Barros, Joélia Martins
Bezerra, Marcos de Almeida
Valasques, Gisseli Souza
Nascimento Júnior, Baraquízio Braga do
Souza, Anderson Santos
Aragão, Nádia Machado de
Abstract: 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.
Palavras-chave: Rations to chicken
Ultrasound-assisted extraction
Mixture design
Doehlert design
Metals
País: Brasil
Tipo de Acesso: Acesso Aberto
URI: http://repositorio.ufba.br/ri/handle/ri/14916
Data do documento: 2013
Aparece nas coleções:Artigo Publicado em Periódico (IMS)

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
0001-3765-aabc-85-03-891.pdf14,44 MBAdobe PDFVisualizar/Abrir
Mostrar registro completo do item Visualizar estatísticas


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.