Determination of lead in water samples after its separation and preconcentration by 4,5-dihydroxy-1,3-benzenedisulfonic acid functionalised polyurethane foam |
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| Authors: | Valfredo A. Lemos Adriana da S. Lima Juracir S. Santos Jacira T. Castro Sérgio L. C. Ferreira |
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| Affiliation: | 1. Universidade Estadual do Sudoeste da Bahia, Laboratório de Química Analítica (LQA) , Campus de Jequié, 45506-191 Jequié , Bahia , Brazil valfredoazevedo@yahoo.com.br;3. Universidade Estadual do Sudoeste da Bahia, Laboratório de Química Analítica (LQA) , Campus de Jequié, 45506-191 Jequié , Bahia , Brazil;4. Universidade Federal da Bahia, Instituto de Química, Campus Universitário de Ondina , 40.170-280 Salvador , Bahia , Brazil;5. Universidade Estadual do Sudoeste da Bahia, Laboratório de Química Analítica (LQA) , Campus de Jequié, 45506-191 Jequié , Bahia , Brazil;6. Universidade Federal do Rec?ncavo da Bahia, Centro de Ciências Exatas e Tecnológicas , Cruz das Almas , Bahia , Brazil |
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| Abstract: | A new sorbent based on polyurethane foam functionalised with 4,5-dihydroxy-1,3-benzenedisulfonic acid (Tiron-PUF) was synthesised. This material was used in the development of a procedure for preconcentration of lead, with subsequent detection by flame atomic absorption spectrometry (FAAS). The influence of some variables involved in the extraction process was studied. Analytical parameters were evaluated using 50 and 500?mL of Pb (II) solution. Under optimum conditions, the system showed enrichment factors of 38 (50?mL) and 114 (500?mL). The detection limits obtained were 0.5 and 1.1?µg?L?1 when volumes of 500 and 50?mL of Pb (II), respectively, were used. The method was applied to the determination of lead content in well water and drinking water samples collected in the town of Amelia Rodrigues, Bahia, Brazil. |
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| Keywords: | preconcentration polyurethane foam functionalisation lead tiron water |
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