流动注射法测定铅 英文版.doc

ANALYTICAL SCIENCES MAY 2000, VOL. 16  513 2000 ? The Japan Society for Analytical Chemistry On-line Preconcentration and Determination of Lead in Iron and Steel 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-line preconcentration on a lead selective resin, Pb·SpecTM, with flame atomic absorption spectrometry. The sample prepared as a nitric acid solution is passed through a column packed with Pb·SpecTM. The lead retained on the column is then eluted with ammonium oxalate solution and introduced directly into the nebulizer of a flame atomic absorption spectrophotometer. The proposed method was successfully applied to the determination of lead in pure iron certified reference material [0.19?? 0.01 ppm (n=6); certified value: 0.2 ppm] and lead-free cutting steel certified reference material [0.0952?? 0.0008 % (n=3); certified value: 0.097 %]. The detection limit (3?) was 0.05??g of lead. (Received December 20, 1999; Accepted March 2, 2000)  High purity iron has recently received much attention as a new material with excellent characteristics.1,2 The development of reliable analytical methods for the determination of trace impurity elements are required for production of pure iron. On the other hand, the use of scrap iron is increasing to make use of resources effectively and the accurate determination of various impurity metals in iron and steel is therefore essential for the quality control of iron products. The detec