Simultaneous preconcentration of lead and cadmium ions with methyltrioctylammonium chloride supported on microcrystalline naphthalene and determination by flame atomic absorption spectrometry
Open Access
- 30 September 2010
- journal article
- Published by European Journal of Chemistry in European Journal of Chemistry
- Vol. 1 (3), 216-220
- https://doi.org/10.5155/eurjchem.1.3.216-220.86
Abstract
A sensitive and selective preconcentration method has been developed for the determination of trace amounts of lead and cadmium ions by using naphthalene-methyltrioctylammonium chloride as an adsorbent. Lead and cadmium ions were retained by the adsorbent in the minicolumn as PbI42- and CdI42-, respectively. The column was washed by 5 mL of 2 mol L-1 nitric acid solution to elute the adsorbed cations. The collected eluents then were determined by flame atomic absorption spectrometry (FAAS). Potential factors affecting on the recovery of the analytes were investigated. Meanwhile optimum conditions were established. The preconcentration factor for lead (II) and cadmium (II) have been 300 and 100, respectively. The calibration curves were linear in the range of 3 to 100 ng mL-1 for Pb2+ and in the range of 1 to 100 ng mL-1 for Cd2+, in the original water samples. The detection limits for Pb2+ and Cd2+ are 0.42 and 0.072 ng mL-1 respectively. On the other hand, the relative standard deviation (RSD) for 11 replicate measurements of 20 ng mL-1 Pb2+ and Cd2+ were 2.2% and 1.4% in the initial solution respectively (n=11). The developed method was successfully applied for the determination of trace Pb2+ and Cd2+ ions in a variety of water samples.Keywords
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