Evaluation of Tungsten Coil Atomic Emission Spectrometry for the Direct Determination of Al in Tea Infusions and Iced Tea

Autor(es)

Santos, Luana N. ^[1] ; Gonzalez, Mario H. ^[2] ; Moura, Monise F. ^[3] ; Donati, George L. ^[4] ; Nobrega, Joaquim A. ^[3]

Afiliação do(s) autor(es)

^[1] Santa Cruz State Univ Soane Nazare Andrade, Dept Exacts & Technol Ssci, BR-45662900 Ilheus, BA - Brazil

^[2] Univ Estadual Santa Cruz, Inst Biosci Letters & Exact Sci, Dept Chem & Environm Sci, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

^[3] Univ Fed Sao Carlos, Dept Chem, Grp Appl Instrumental Anal, Ilheus, BA - Brazil

^[4] Wake Forest Univ, Dept Chem, Winston Salem, NC 27109 - USA

• Tipo de documento: Artigo Científico
• Fonte: FOOD ANALYTICAL METHODS; v. 9, n. 3, p. 624-629, MAR 2016.
• Citações Web of Science: 1

Resumo

This work describes the determination of aluminum in tea infusions and iced tea by tungsten coil atomic emission spectrometry (WCAES). The instrumentation is simple, inexpensive, and potentially portable. It uses a tungsten filament extracted from 150 W, 15 V commercially available slide projector light bulbs as electrothermal atomizer. A simple power supply that provides a constant potential is used to heat the coil. Tea infusions were directly analyzed by application of an optimized heating program. In order to avoid matrix interferences, the iced tea samples were diluted with an oxidizing mixture composed of hydrogen peroxide and nitric acid and also analyzed by a tailored heating program. Aluminum was quantified in all samples, and the results were in agreement with those obtained by inductively coupled plasma optical emission spectrometry at a 95 % confidence level. The limit of detection and the relative standard deviation for a solution containing 2.5 mg L-1 Al (n = 10) were determined, and the values were 0.09 mg L-1 and 5.1 %, respectively. (AU)

• Processo FAPESP: 10/50238-5 - Determinacao de fosforo, enxofre e silicio em biodiesel usando espectrometro de massa acoplado ao plasma induzido com interface de colisao e reacao
• Beneficiário: George Luis Donati
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 07/51448-0 - Construcao e aplicacao analitica de espectrometro de emissao atomica com atomizacao eletrotermica em filamento de tungstenio.
• Beneficiário: Joaquim de Araújo Nóbrega
• Modalidade de apoio: Auxílio à Pesquisa - Regular