Part of #on-line preconcentration and determination of ultra trace amount of lead in tap and spring water samples by atomic absorption spectrometry# :
Publishing year : 2009
Conference : First International Conference on Water Resources Management
Number of pages : 12
Abstract: In this study, a procedure for determining the trace levels of lead (II) in a water sample was developed for a single-phase solid phase preconcentration coupled with a flame atomic absorption spectrometric (SP-FAAS) procedure. A mini-column packed with chloromethylated polystyren functionalized with N, N-bis (naphthylideneimino) diethylene triamine (PS-NAPdine) was used for the enrichment of trace amounts of lead from water samples. The preconcentrated Pb (II) ions were eluted from the mini-column using 2.0M hydrochloric acid. Chemical and flow injection variables were optimized for quantitative preconcentration and determination of lead (II). Under the optimum conditions, the calibration graph was linear over the rang of 0.008-0.2 g mL-1 for preconcentration volume of 20.0 ml sample solution. The detection limit (DL) for the preconcentration of 10.0 ml of the sample solution was 0.005 g mL-1. An enrichment factor for a sample volume of 10.0 ml was obtained. The relative standard deviation for 6 replicate determinations of lead (II) at 0.02, 0.10 and 0.20 g mL-1 levels was 6.1%, 2.1% and 2.0%, respectively. The effect of the presence of various species commonly associated with real samples was also investigated. The accuracy of the proposed method was demonstrated by analyzing different water samples.