Analytical Sciences

On-line Preconcentration and Determination of Lead in Iron andSteel by Flow Injection-Flame Atomic Absorption Spectrometry

Tatsuya SEKI,* Hiroyuki TAKIGAWA,** Yoshihiro HIRANO,** Yoichi ISHIBASHI,***and Koichi OGUMA**

*Central Research Institute, Nissan Chemical, Industries, Ltd., Tsuboicho, Funabashi 274-8507, Japan
**Department of Materials Technology, Faculty of Engineering, Chiba University,Yayoicho, Inage, Chiba 263-8522, Japan
***Analytical Center, Kohkankeisoku Corp., Minamiwataridacho, Kawasaki, Kawasaki 210-0855, Japan

A flow injection method has been developed for the determination of lead in steel samples by coupling on-linepreconcentration on a lead selective resin, Pb.Spec^TM, with flame atomic absorption spectrometry. The sample preparedas a nitric acid solution is passed through a column packed with Pb.Spec^TM. The lead retained on the column is theneluted with ammonium oxalate solution and introduced directly into the nebulizer of a flame atomic absorptionspectrophotometer. The proposed method was successfully applied to the determination of lead in pure iron certifiedreference material [0.19 qّ.01 ppm (n=6); certified value: 0.2 ppm] and lead-free cutting steel certified referencematerial [0.0952qّ.0008% (n=3); certified value: 0.097%]. The detection limit (3 ) was 0.05 g of lead.

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