カラム前濃縮/原子吸光法による海水中の亜鉛の迅速定量(<特集>環境汚染物質の分析化学)

概要

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Atomic absorption spectrometry with on-line chelating-resin column preconcentration has been applied to rapid determination of zinc in seawater. Filtered coastal seawater samples adjusted to pH 2.2 by adding 1ml of cone, nitric acid against to 1 1 of seawater was pumped at 6.0ml min^<-1> and mixed with a stream of ammonium acetate buffer (pH 7) at 0.5ml min^<-1>. The sample was then passed through a microcolumn (3.2mm i. d. 16mm long) packed with Chelex-100 for 1 min. The column was washed with distilled water for 30 s and sequentially chelated zinc was eluted with about 160μl of 2M nitric acid at 3.0ml min^<-1> for AAS determination. This method gave enhanced sensitivity of zinc by over 19 times better than that of a conventional AAS. The detection limit of the present method was 0.5ppb (S/N=2). Precision of this method was 2.7% (R. S. D.) at the 10ppb level of zinc aqueous standard. About 30 samples could be analyzed for 1h. The present method was successfully applied to the rapid determination of zinc in seawater of Beppu Bay.
社団法人日本分析化学会の論文
1987-03-05