2006•Metallurgical AnalysisRequires access

Determination of lead in environmental sample with 2-hydroxynaphthal-1-methylenerodanine by solid phase extraction spectrophotometry

Ming Li, Lin Hong, Guangyu Yang

Abstract

The color reaction of lead? with 2-hydroxynaphthal-1-methylenerodanine(HNR)was studied.In pH 4.5 buffer solution and in the presence of Tween-80,HNR can reacts with lead?to form a stable 2∶1 complex.The complex can be extracted by Waters Sep-Pak C_(18) cartidge and eluted with N,N~′-dimethylformamide(DMF).In the medium of DMF,the maximum absorption of complex is located at 548 nm,and the apparent molar absorptivity is 1.04×10~5 L·mol~(-1)·cm~(-1).Beer's law is obeyed in the range of 0.05～4.0 μg/mL for lead.This method has been applied to the determination of lead in environmental samples with recovery between 96.0% and 104.0% and RSD ≤2.5%.

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Key concepts: Molar absorptivity, Spectrophotometry, Chemistry, Solid phase extraction, Extraction (chemistry), Dimethylformamide, Color reaction, Elution