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.
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