Determinação direta e simultânea de Al, As, Fe, Mn e Ni em cachaça por espectrometria de absorção atômica em forno de grafite

Abstract

Este trabalho propõe um método simples, rápido e confiável para determinação direta e simultânea de Al, As, Fe, Mn e Ni em cachaça por espectrometria de absorção atômica em forno de grafite (GFAAS). A superfície superior da plataforma do tubo de grafite foi revestida com filme à base de tungstênio (WxCyOz).O programa de aquecimento otimizado (temperatura, tempo de rampa, tempo de patamar) foi o seguinte: secagem 1 (100ºC, 5 s, 5 s); secagem 2 (120ºC, 5 s, 5 s); pirólise (1300ºC, 10 s, 30 s); atomização (2200ºC, 1 s, 6 s) e limpeza (2550ºC, 1 s, 3s). Os desvios padrões relativos (n=3) foram < 4,4%, < 0,7%, < 11%, < 6,0%, < 1,2% para os elementos Al, As, Fe, Mn e Ni, respectivamente. A exatidão foi avaliada por meio de testes de adição e recuperação dos analitos em 8 amostras de cachaças comerciais, e as recuperações situaram-se nos seguintes intervalos: 80 - 105% (Al), 81 - 92% (As), 82 - 108% (Fe), 83 - 106% (Mn), 83 - 108% (Ni). Os limites de detecção calculados foram 9,7 µg L-1 Al, 2,3 µg L-1 As, 12 µg L-1 Fe, 14 µg L-1 Mn e 0,8 µg L-1 Ni.

Feasibility of internal standardization in the direct and simultaneous determination of As, Cu and Pb in sugar-cane spirits by graphite furnace atomic absorption spectrometry

“…Only one samples presented a Cu and Pb content higher than 5000 g L −1 and 200 g L −1 , respectively, the maximum established by the Brazilian Ministry of Agriculture, Livestock and Food Supply [6]. The levels of As, Cu, and Pb found in this work were close to those obtained for cachaç a reported in the literature [11][12][13][14]. Table 2 Results (n = 4) for As, Cu and Pb determination in Brazilian sugar-cane spirits by GFAAS using internal standardization and by ICP-MS as a comparative technique.…”

“…GFAAS was employed as technique for determination of Cr, Sb [10], Al, Cd, Pb [11], Al, As, Fe, Mn, Ni [12], and As, Cu, Pb [13,14] in cachaç a. These methods circumvented matrix effects by employing matrix matching as the calibration method.…”

“…These methods circumvented matrix effects by employing matrix matching as the calibration method. Among medium used are 40% (v/v) ethanol [10,11], 10% (v/v) ethanol + 5 mg L −1 Ca, Mg, Na, [13] and cachaç a sample [12,14]. Internal standardization (IS) can also be adopted as a simple and efficient strategy to avoid matrix effects in GFAAS [15][16][17][18][19][20][21].…”

Magnetic solid phase microextraction using CoFe2O4 nanoparticles for determination of Cu, Cd, Pb and V in sugar cane spirit samples by energy dispersive X-ray fluorescence spectrometry

“…The quantification of metallic specie is important for product quality control, observing the inorganic composition assurance and the presence of toxic elements to humans [5]. These determinations are routinely performed by flame atomic absorption spectrometry (F AAS), [6][7][8][9], inductively coupled plasma mass spectrometry (ICP-MS) [10], electrothermal atomic absorption spectrometry ET AAS [2,4,11,12,13] and UV-Vis spectrophotometry [14,15]. However, the energy dispersive X-ray fluorescence spectrometry (EDXRF) has not been explored for determination of inorganic species in sugar cane spirit.…”

An alternative method for the simultaneous determination of copper and lead for quality control of sugar cane spirit using a nanotube-based sensor

“…[4][5][6][7][8] Excess lead intake also produces harmful effects on the human health since several organ systems are affected and nervous, gastrointestinal, reproductive, skeletal and biochemical activities are impaired. 9,10 Analysis of copper and lead in the sugar cane spirit is routinely carried out using flame atomic absorption spectrometry (F AAS), [11][12][13][14][15][16] inductively coupled plasma mass spectrometry (ICP-MS) 17 and UV-Vis spectrophotometry. 18,19 The electroanalytical techniques can be used as an alternative method in analytical chemistry and offer the additional benefit of being compatible with the principles of green chemistry.…”