Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Santos, Luana N. [1] ; Gonzalez, Mario H. [2] ; Moura, Monise F. [3] ; Donati, George L. [4] ; Nobrega, Joaquim A. [3]
Total Authors: 5
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: FOOD ANALYTICAL METHODS; v. 9, n. 3, p. 624-629, MAR 2016.
Web of Science Citations: 1
Abstract

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)