Determination of lead in natural waters using flow injection with on-line preconcentration and flame AAS detection |
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Authors: | D. Rodríguez P. Fernández C. Pérez-Conde A. Gutiérrez C. Cámara |
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Affiliation: | (1) Departamento de Química Analítica, Facultad de Ciencias Químicas de la Universidad Complutense, E-28040 Madrid, Spain |
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Abstract: | A rapid and sensitive method has been developed for the determination of lead in water samples by flame atomic absorption spectrometry using on-line preconcentration on a microcolumn packed with silica gel treated with a mixture of Aliquat 336 and nitroso-R-salt. The lead is retained at pH 5.5. The preconcentrated lead is directly eluted from the column to the nebulizer-burner system using 150 L of 0.1 mol/L hydrochloric acid. The optimum preconcentration conditions are given and the retention efficiency achieved is higher than 80%. The enrichment factor is 37 and 100 for sample volumes of 5 and 30 mL, respectively. The limits of detection are 10.0, 6.0 and 4.0 ng/mL when 5, 10 and 30 mL of water is preconcentrated. |
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