Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/241758
Type: Artigo de periódico
Title: Double Tungsten Coil Atomic Absorption Spectrometer Based On An Acousto-optic Tunable Filter
Author: Jora
M. Z.; Nobrega
J. A.; Rohwedder
J. J. R.; Pasquini
C.
Abstract: An atomic absorption spectrometer based on a quartz acousto-optic tunable filter (AOTF) monochromator operating in the 271-453 nm range, is described. The instrument was tailored to study the formation and evolution of electrothermal atomic cloud induced either by one or two tungsten coils. The spectrometer also includes a fast response programmable photomultiplier module for data acquisition, and a power supply capable of driving two parallel tungsten coils independently. The atomization cell herein described was manufactured in PTFE and presents a new design with reduced size. Synchronization between the instant of power delivering to start the atomization process and the detection was achieved, allowing for monitoring the atomization and thermal events synchronously and in real time. Absorption signals can be sampled at a rate of a few milliseconds, compatible with the fast phenomena that occur with electrothermal metallic atomizers. The instrument performance was preliminarily evaluated by monitoring the absorption of radiation of atomic clouds produced by standard solutions containing chromium or lead. Its quantitative performance was evaluated by using Cr aqueous solutions, resulting in detection limits as low as 0.24 mu g L-1, and a relative standard deviation of 3%. (C) 2014 Elsevier B.V. All rights reserved.
Subject: Emission-spectrometry
Biological-materials
Online Separation
Natural-waters
Lead
Preconcentration
Spectroscopy
Atomization
Cadmium
Modifier
Country: OXFORD
Editor: PERGAMON-ELSEVIER SCIENCE LTD
Rights: embargo
Identifier DOI: 10.1016/j.sab.2014.11.001
Address: http://www.sciencedirect.com/science/article/pii/S0584854714002961
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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