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https://repositorio.ufba.br/handle/ri/7786
metadata.dc.type: | Artigo de Periódico |
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 |
metadata.dc.creator: | Ferreira, Sergio Luis Costa Lemos, Valfredo Azevedo Santelli, Ricardo Erthal Ganzarolli, Edgard Curtius, Adilson José |
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. |
Keywords: | Flame atomic absorption spectrometry Flow injection system Amberlite XAD-2 2-(2-benzothiazolylazo)-2-p-cresol Lead |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/7786 |
Issue Date: | 2001 |
Appears in Collections: | Artigo Publicado em Periódico (Química) |
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Ferreira.pdf Restricted Access | 149,38 kB | Adobe PDF | View/Open Request a copy |
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