RETRACTED: Preconcentration and solid-phase extraction of beryllium, lead, nickel, and bismuth from various water samples using 2-propylpiperidine-1-carbodithioate with flame atomic absorption spectrometry (FAAS) (Retracted Article. See vol 75, pg 1400, 2008)

A facile and novel method has been developed for the determination of beryllium, lead, nickel, and bismuth in various water samples. In the present investigation, the use of syringe was loaded with sorbent for the separation and enrichment of beryllium, lead, nickel, and bismuth prior to their analysis by flame atomic absorption spectrometry was described to substitute the batch and column techniques. The proposed method was compared with column technique with respect to easiness, fastness, simplicity, recovery and risk of contamination. The syringe was loaded with 1.0 g of sorbent in order to retain the analyte elements. Seven millilitres of sample solution (pH 5.0 +/- 0.2) was drawn into the syringe in 15 s and discharged over 15 s. Then, 3.0 M HCl eluent, was drawn into the syringe and ejected back to desorb the analyte elements. At the Optimum conditions, the percentage recoveries of Be, Ph, Ni, and Bi in the range of 94.28-99.02% with standard deviations (S.D.) of 0.11%. The elements could be concentrated by drawing and discharging several portions of sample successively but eluting only one time. The detailed study of various interferences made the confirmation of the method highly selective. The risk of contamination is less than that with the column technique. The method was successfully applied for the determination of Be, Pb, Ni, and Bi in spiked and natural water samples. The results obtained are in good agreement with the reported methods at the 95% confidence level. (c) 2005 Elsevier B.V. All rights reserved.