Double tungsten coil atomic absorption spectrometer based on an acousto-optic tunable filter

Autor(es)

Jora, M. Z. ^[1] ; Nobrega, J. A. ^[2] ; Rohwedder, J. J. R. ^[1] ; Pasquini, C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY; v. 103, p. 1-8, JAN-FEB 2015.
• Citações Web of Science: 1

Resumo

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. (AU)

• Processo FAPESP: 08/57808-1 - Instituto Nacional de Ciências e Tecnologias Analíticas Avançadas - INCTAA
• Beneficiário: Celio Pasquini
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 12/01957-4 - Construção de um espectrômetro de absorção atômica e estudos de formação e evolução da nuvem atômica com atomização eletrotérmica em sistema de duplo filamento de tungstênio
• Beneficiário: Manassés Zuliani Jora
• Modalidade de apoio: Bolsas no Brasil - Mestrado