Shin-ichi Hasegawa1, Takeshi Kobayashi1, Koichi Sato1,Shukuro Igarashi2 and Kunishige Naito2
1National Research Institute for Metals, Tsukuba 305-0047
A simple pretreating method, which consists of solid phase extraction using, bonded silica with benzenesulfonic acid as a solid phase sorbent was tried for the determination of trace elements in pure aluminium samples by means of graphite furnace atomic absorption spectrometry(GF-AAS). The acidic solutions were prepared by dissolving samples in sodium hydroxide, subsequently adding nitric acid. The analytes could be separated as 1-10 phenanthroline chelate from the matrix by the solid phase extraction after adjusting pH and adding 1-10 phenanthroline. The optimum condition for aluminium separation was pH 3 and 20 cm3 of 0.01 kmol/m3 1-10 phenanthroline. As the eluants 15 cm3 of 6 kmol/m3 nitric acid were used. In this method, some trace elements such as Fe, Ni, Co, Cu, and Zn were determined by GF-AAS using the eluate. The detection limits (3σ of blank value) were 0.03 ppm of Fe, Ni and Co, 0.02 ppm of Cu and 0.004 ppm of Zn when the weight of the sample was 1 g.
(Received June 10, 1999; In Final Form August 25, 1999)
graphite furnace atomic absorption spectrometry, solid phase extraction, bonded silica with benzenesulfonic acid, solid phase sorbent, 1-10 phenantororin, chelating agent of analyte, determination of iron, nickel, cobalt, copper, zinc in pure aluminium
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