Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 21, Issue 12, Pages 2340-2346Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532010001200022
Keywords
vegetal leaves; natural waters; simplex optimization; manganese; automated online preconcentration
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Funding
- Fundacao de Amparo a Pesquisa do Estado da Bahia (FAPESB)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Universidade Estadual do Sudoeste da Bahia (UESB)
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An automated procedure was developed to determine trace amounts of manganese from vegetal leaves and river waters using flame atomic absorption spectrometry (FAAS) after online preconcentration of this metal using an Amberlite XAD-4 minicolumn modified with 2-aminothiophenol. The preconcentration system is based on the solid-phase extraction of the metal into the minicolumn and elution with 0.30 mol L-1 hydrochloric acid, followed by its determination. Variables associated with the preconcentration system performance, such as pH, sampling flow rate and eluent concentration were optimized using a basic simplex as multivariate technique. The developed method provides an improvement factor of 14 along with limit of detection (3 sigma(B)) of 2.0 mu g L-1, and precision expressed as a 2.2% relative standard deviation (RSD%, n = 10, 30.0 mu g L-1). The procedure was applied to determine manganese in river waters collected from urban area of Jequie/Bahia. The accuracy of the procedure was checked by analysis of two certified reference materials (apple leaves, NIST 1515 and spinach leaves, NIST 1570). The developed procedure has been applied for manganese determination in vegetal leaves (chive, spinach, cauliflower and cabbage).
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