ON-LINE PRECONCENTRATION SYSTEM FOR DETERMINATION OF LEAD IN WATER AND SEDIMENT SAMPLES BY FLOW INJECTION-FLAME ATOMIC ABSORPTION SPECTROMETRY
- 27 March 2002
- journal article
- Published by Taylor & Francis in Analytical Letters
- Vol. 35 (3) , 487-499
- https://doi.org/10.1081/al-120002682
Abstract
Diaion HP-20 was used for on-line separation/preconcentration and determination of lead by flow injection flame atomic absorption spectrometry. Lead is preconcentrated at pH 9 as its 1-nitroso-2-naphthol (NN) complex onto mini column. The elution step is performed with a stream of 1 M HNO3 at 3.0 ml/min and lead displaced is introduced directly into the nebuliser of flame atomic absorption spectro-meter. The proposed method was successfully applied to the determination of lead in a stream sediment reference material (23.9 ± 0.12 µg/g certified value: 23.0 µg/g) and natural water samples. The detection limit (3σ) was 2.0 µg/l for preconcentration at 3.0 ml/min. The recoveries of spike additions to drinking water sample were greater than 95%.Keywords
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