Synthesis and Application of a New Functionalized Resin in On‐Line Preconcentration of Lead

Abstract

An on‐line system for preconcentration and determination of lead at µg L⁻¹ level is proposed. Amberlite XAD‐2 functionalized with 2‐(2′‐benzothiazolylazo)‐p‐cresol (BTAC‐XAD) packed in a minicolumn was used as sorbent. Chemical and hydrodynamic variables were evaluated and the results demonstrated that lead can be determined using sample pH at 7.0–7.5, elution with 0.050 mol L⁻¹ HCl and a sample flow rate of 6.0 mL min⁻¹. Enrichment factors of 19, 43, and 60 were achieved by using the time‐based technique with preconcentration periods of 60, 120, and 180 s, respectively. Detection limit (3s) was 1.7 µg L⁻¹ when used preconcentration time of 180 s. This procedure was applied to lead determination in natural water samples. Accuracy of procedure was confirmed by lead determination in certified reference materials.

Keywords:

• BTAC
• functionalization
• lead
• FAAS
• amberlite XAD‐2

Acknowledgments

Authors are grateful to Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and Financiadora de Estudos e Projetos (FINEP) for financial support.