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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%.
ACKNOWLEDGMENT
The authors are grateful for the financial support of Research Foundation of Erciyes University (Kayseri, Turkey). Authors thank to Dr. Sibel Saracoglu for her helps in the experiments. The authors also would like to thank the Scientific and Technical Research Council of Turkey (TUBITAK) for providing Perkin-Elmer 3110 atomic absorption spectrometer used in the present study.
