サクション-フロー水素化物生成-加熱石英セル原子化法による鉛の原子吸光分析

概要

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A method for the determination of lead(II) by suction-flow hydride generation-heated quartz cell atomic absorption spectrometry using a continuous hydride generator equipped with a Teflon sampling suction cup was described. A 1-cm^3 sample solution which was buffered with a pH 2.5 citrate solution was dropped into the suction cup and introduced by suction into streams of 0.8 mol dm^<-3> hydrochloric acid and 10 % hydrogen peroxide solutions. Then the solution was mixed with 7.5 % sodium borohydride solution in the reaction coil. The evolved hydride was swept into the electrically-heated quartz cell by an argon carrier gas and subsequently the atomic absorption of lead was measured. The peak height of spike-like signal for lead with 1-cm3 of sample solution was as high as about 50 % to that of broad signal obtained by conventional continuous sample introduction method with 15〜20 cm^3 of the same solution. The linear calibration was obtained up to 250 ng Pb cm^<-3>. The detection limit was estimated to be 2.7 ng Pb cm^<-3> and the relative standard deviation for 10 replicate measurements was 2.7 % for 100 ng Pb cm^<-3>. More than 40 samples could be analyzed within one hour. This method was applied to the analysis of plant leaves standard reference materials.
社団法人日本分析化学会の論文
1984-11-05