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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/7786

Title: An automated on-line flow system for the pre-concentration and determination of lead by flame atomic absorption spectrometry
Other Titles: Microchemical Journal
Authors: Ferreira, Sergio Luis Costa
Lemos, Valfredo Azevedo
Santelli, Ricardo Erthal
Ganzarolli, Edgard
Curtius, Adilson José
Keywords: Flame atomic absorption spectrometry;Flow injection system;Amberlite XAD-2;2-(2-benzothiazolylazo)-2-p-cresol;Lead
Issue Date: 2001
Abstract: The use of Amberlite XAD-2 modified by 2-(2-benzothiazolylazo)-2-p-cresol (BTAC) as a sorbent in an on-line pre-concentration system for lead determination has been proposed. The procedure is based on the sorption of lead(II) ions onto a minicolumn packed with modified Amberlite XAD-2, followed by elution with 0.10 mol l−1 hydrochloric acid and determination by flame atomic absorption spectrometry. The on-line flow system uses four three-way solenoid valves and is electronically controlled in a time-based mode. Chemical and flow variables were optimized. The results demonstrated that sample solutions containing lead(II) in the concentration range from 3.7 to 300.0 μg l−1 in a solution of pH between 6.5 and 8.5 could be determined, using a pre-concentration time of 2 min. The enrichment factor was 27 for a sample volume of 4.50 ml. The limit of detection was 3.7 μg l−1. The relative standard deviations (R.S.D.) were in the range of 4.4–2.3% for lead concentrations from 50.0 to 300.0 μg l−1, respectively. The method was tolerant to other ions usually present in biological samples. Good accuracy was assured by the analysis of biological reference materials.
Description: Texto completo: acesso restrito. p. 41–46
URI: http://www.repositorio.ufba.br/ri/handle/ri/7786
ISSN: 0026-265X
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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