Multivariate optimization of an ultrasound-assisted extraction procedure for Cu, Mn, Ni and Zn determination in ration to chickens

Abstract

In this work, multivariate optimization techniques were used to develop a method based on the ultrasoundassisted 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.

Optimization of Analytical Methods Using Response Surface Methodology - Part I: Process Variables

“…Barros et al 64 usaram planejamento Doehlert e função de desejabilidade na otimização de um método com base na extração assistida por ultrassom para determinação de cobre, manganês, níquel e zinco por espectrometria de absorção atômica com chama (FAAS) em amostras de ração para nutrição de frangos. Os resultados são apresentados na Tabela 6.…”

Ultrasound-Assisted Extraction Applied to Mg, Mn and Zn Determination in Chia Seeds and Flours by F AAS

“…Outros autores reportaram valores similares para os limites de quantificação quando a extração assistida por ultrassom foi aplicada como método de preparo de amostra e a espectrometria de absorção atômica com chama (F AAS) foi adotada como técnica de detecção de metais em diferentes matrizes. Priego-Capote e Castro (2004) 42 47 encontraram limites de quantificação de 4,2, 1,4 e 2,1 µg g -1 para a extração de Mg, Mn e Zn, respectivamente em ração para peixes enquanto Barros et al (2013) 52 determinaram valores de LQ de 4,5 e 9,7 µg g -1 para a extração de Mn e Zn de ração para frangos. Todavia, Peronico e Raposo Jr (2016), 40 na extração de Cu, Mn, Ca e Mg de sementes oleaginosas encontraram valores de LQ de 417 µg g -1 e 3,5 mg g -1 para Mn e Mg, os quais foram bem superiores aos determinados neste estudo.…”

Synthesis of MnCo2O4 nanoparticles as modifiers for simultaneous determination of Pb(II) and Cd(II)

“…Contamination of heavy metal ions is one of the most serious environmental issues, since heavy metal ions are not biodegradable and they accumulate in living organisms, tracking the heavy metal concentration in environment is of utmost importance. Heavy metal content is often quantified by well-known analytical methods, such as atomic absorption spectrometry (AAS) [3,4] inductively coupled plasma-mass spectrometry (ICP-MS) [5,6], inductively coupled plasma-optical emission spectrometry (ICP-OES) [7,8]and X-ray fluorescence spectrometry (XRF) [9]. Besides numbered techniques, electrochemical methods are also often used in analysis of heavy metals, mostly due to their high sensitivity, easy operation and transferability [10–12].…”